Global USE flags

Flag	Description	Packages
"${IUSE_TARGETS[@]/amdgpu_targets_/amdgpu_targets_}"		4
"(		15
$(printf		5
$(ruby_get_use_targets)		3
${IUSE}		15
${PYTHON_REQUIRED_USE}		3
'		4
(		51
)		46
)"		15
3d	Build Qt3DCore, Qt3DAnimation, Qt3DExtras, Qt3DInput, Qt3DLogic, and Qt3DRender modules	3
7z	Add Support for the 7z archive format	2
7zip	Enable 7zip/lzma archive support	2
R	Enable support for <pkg>dev-lang/R</pkg>	5
X	Add support for X11	404
Xaw3d	Add support for the 3d athena widget set	7
\		3
a52	Enable support for decoding ATSC A/52 streams used in DVD	6
aac	Enable support for MPEG-4 AAC Audio	20
aalib	Add support for media-libs/aalib (ASCII-Graphics Library)	11
abi_mips_n32	64-bit (32-bit pointer) libraries	4
abi_mips_n64	64-bit libraries	2
abi_mips_o32	32-bit libraries	3
abi_s390_64	64-bit (s390x) libraries	0
abi_x86_32	32-bit (x86) libraries	17
abi_x86_64	64-bit (amd64) libraries	12
abi_x86_x32	x32 ABI libraries	2
accessibility	Add support for accessibility (eg 'at-spi' library)	14
accountsservice	Add support for AccountsService	3
acl	Add support for Access Control Lists	42
acpi	Add support for Advanced Configuration and Power Interface	3
activities	Enable kactivities support	16
ada	Build the Ada language (GNAT) frontend	2
ada_target_gcc_12	Compile with sys-devel/gcc:12	0
ada_target_gcc_13	Compile with sys-devel/gcc:13	0
ada_target_gcc_14	Compile with sys-devel/gcc:14	0
ada_target_gcc_15	Compile with sys-devel/gcc:15	0
ada_target_gcc_16	Compile with sys-devel/gcc:16	0
addressbook	Enable <pkg>kde-apps/akonadi</pkg> contact integration	2
admin	Install <pkg>lxqt-base/lxqt-admin</pkg>	4
adolc	Add test support for Adolc (<pkg>sci-libs/adolc</pkg>)	3
afs	Add OpenAFS support (distributed file system)	5
aio	Add support for AIO.	6
airplay	Support for airplay format	2
allegro	Add support for Allegro	5
alloca	Use alloca(3) instead of malloc(3) for memory management	2
alsa	Add support for media-libs/alsa-lib (Advanced Linux Sound Architecture)	172
alsa_cards_emu10k1	Emu10k1 (SB Live!, Audigy, E-mu APS)	2
alsa_cards_hdsp	RME Hammerfall DSP Audio	2
alsa_cards_hdspm	RME Hammerfall DSP MADI	2
alsa_cards_mixart	Digigram miXart	2
alsa_cards_pcxhr	Digigram PCXHR	2
alsa_cards_sb16	Sound Blaster 16 (PnP)	2
alsa_cards_usb-usx2y	Tascam US-122, US-224 and US-428 USB driver	2
alsa_cards_vx222	Digigram VX222	2
amdgpu_targets_gfx1010	RDNA GPU, codename navi10, including Radeon RX 5700XT/5700/5700M/5700B/5700XTB/5600XT/5600/5600M, Radeon Pro 5700XT/5700, Radeon Pro W5700X/W5700	0
amdgpu_targets_gfx1011	RDNA GPU, codename navi12, including Radeon Pro 5600M/V520	0
amdgpu_targets_gfx1012	RDNA GPU, codename navi14, including Radeon RX 5500XT/5500/5500M/5500XTB/5300/5300M, Radeon Pro 5500XT/5500M/5300/5300M, Radeon Pro W5500X/W5500/W5500M/W5300M	0
amdgpu_targets_gfx1030	RDNA2 GPU, codename navi21/sienna cichlid, including Radeon RX 6950XT/6900XT/6800XT/6800, Radeon Pro W6800/V620	0
amdgpu_targets_gfx1031	RDNA2 GPU, codename navi22/navy flounder, including Radeon RX 6750XT/6700XT/6800M/6700M	0
amdgpu_targets_gfx1100	RDNA3 GPU, codename navi31/plum bonito, including Radeon RX 7900 XTX/XT/GRE, AMD Radeon Pro W7900/W7800	0
amdgpu_targets_gfx1101	RDNA3 GPU, codename navi32, including Radeon RX 7700XT/7800XT, AMD Radeon PRO W7700/V710	0
amdgpu_targets_gfx1102	RDNA3 GPU, codename navi33, including Radeon RX 7400/7600/7600M/7600M XT/7700S/7600S, AMD Radeon PRO W7600/W7500	0
amdgpu_targets_gfx1103	RDNA3 APU, codename navi3x, including Radeon 700M/780M	0
amdgpu_targets_gfx1150	RDNA 3.5 APU (Strix Point), including Radeon 890M	0
amdgpu_targets_gfx1151	RDNA 3.5 APU (Strix Halo), including Radeon 8060S	0
amdgpu_targets_gfx1152	RDNA 3.5 APU (Krackan Point), including Radeon 860M/840M	0
amdgpu_targets_gfx1153	RDNA 3.5 APU, including Radeon 820M	0
amdgpu_targets_gfx1200	RDNA4 GPU, codename navi44, including Radeon RX 9060XT/9060XT LP	0
amdgpu_targets_gfx1201	RDNA4 GPU, codename navi48, including Radeon RX 9070/9070XT/9070GRE and Radeon AI PRO R9600D/R9700	0
amdgpu_targets_gfx803	Fiji GPU, codename fiji, including Radeon R9 Nano/Fury/FuryX, Radeon Pro Duo, FirePro S9300x2, Radeon Instinct MI8	0
amdgpu_targets_gfx900	Vega GPU, codename vega10, including Radeon Vega Frontier Edition, Radeon RX Vega 56/64, Radeon RX Vega 64 Liquid, Radeon Pro Vega 48/56/64/64X, Radeon Pro WX 8200/9100, Radeon Pro V320/V340/SSG, Radeon Instinct MI25	0
amdgpu_targets_gfx906	Vega GPU, codename vega20, including Radeon (Pro) VII, Radeon Instinct MI50/MI60	0
amdgpu_targets_gfx940	CDNA3 Accelerator, codename aqua_vangaram, MI300A rev 0	0
amdgpu_targets_gfx941	CDNA3 Accelerator, codename aqua_vangaram, MI300X rev 0	0
amr	Inlcude AMR codec in the build	5
ant-task	Build and register the ant-task	5
anthy	Enable support for <pkg>app-i18n/anthy-unicode</pkg> or <pkg>app-i18n/anthy</pkg> if prior 1.9.0	2
ao	Use libao audio output library for sound playback	14
aom	Enable support for the AOM codec encoding and decoding	4
apache	Build Apache modules	4
apache2	Add Apache2 support	11
apache2_modules_access_compat	Group authorizations based on host (name or IP address). Available as a compatibility module with previous versions	0
apache2_modules_actions	Provides for executing CGI scripts based on media type or request method	0
apache2_modules_alias	Provides for mapping different parts of the host filesystem in the document tree and for URL redirection	0
apache2_modules_allowmethods	This module makes it easy to restrict what HTTP methods can be used on a server	0
apache2_modules_asis	Sends files that contain their own HTTP headers	0
apache2_modules_auth_basic	Basic authentication	0
apache2_modules_auth_digest	User authentication using MD5 Digest Authentication	0
apache2_modules_auth_form	Allows the use of an HTML login form to restrict access by looking up users in the given providers	0
apache2_modules_authn_anon	Allows "anonymous" user access to authenticated areas	0
apache2_modules_authn_core	Provides core authentication capabilities common to all authentication providers (functionality provided by authn_alias in previous versions)	0
apache2_modules_authn_dbd	User authentication using an SQL database	0
apache2_modules_authn_dbm	User authentication using DBM files	0
apache2_modules_authn_file	User authentication using text files	0
apache2_modules_authn_socache	Maintains a cache of authentication credentials, so that a new backend lookup is not required for every authenticated request	0
apache2_modules_authz_core	Provides core authorization capabilities to various authorization/authorization modules, such as authn_file and authz_user	0
apache2_modules_authz_dbd	Provides authorization capabilities via SQL database so that authenticated users can be allowed or denied access to portions of the web site by group membership	0
apache2_modules_authz_dbm	Group authorization using DBM files	0
apache2_modules_authz_groupfile	Group authorization using plaintext files	0
apache2_modules_authz_host	Group authorizations based on host (name or IP address)	0
apache2_modules_authz_owner	Authorization based on file ownership	0
apache2_modules_authz_user	User Authorization	0
apache2_modules_autoindex	Generates directory indexes, automatically, similar to the Unix ls command	0
apache2_modules_brotli	Enable brotli compression support	0
apache2_modules_cache	Content cache keyed to URIs	0
apache2_modules_cache_disk	Disk based storage module for the HTTP caching filter (similar to mem_cache in previous versions)	0
apache2_modules_cache_socache	Shared object cache (socache) based storage module for the HTTP caching filter	0
apache2_modules_cern_meta	CERN httpd metafile semantics	0
apache2_modules_cgi	Enable CGI module (used by non-multithreaded MPMs, for eg. prefork)	0
apache2_modules_cgid	Enable CGI module (used by multithreaded MPMs, for eg. worker)	0
apache2_modules_charset_lite	Specify character set translation or recoding	0
apache2_modules_dav	Distributed Authoring and Versioning (WebDAV) functionality	0
apache2_modules_dav_fs	filesystem provider for mod_dav	0
apache2_modules_dav_lock	generic locking module for mod_dav	0
apache2_modules_dbd	Manages SQL database connections	0
apache2_modules_deflate	Compress content before it is delivered to the client	0
apache2_modules_dir	Provides for "trailing slash" redirects and serving directory index files	0
apache2_modules_dumpio	Dumps all I/O to error log as desired	0
apache2_modules_env	Modifies the environment which is passed to CGI scripts and SSI pages	0
apache2_modules_expires	Generation of Expires and Cache-Control HTTP headers according to user-specified criteria	0
apache2_modules_ext_filter	Pass the response body through an external program before delivery to the client	0
apache2_modules_file_cache	Caches a static list of files in memory	0
apache2_modules_filter	Context-sensitive smart filter configuration module	0
apache2_modules_headers	Customization of HTTP request and response headers	0
apache2_modules_http2	Enable http2/alpn module	0
apache2_modules_ident	RFC 1413 ident lookups	0
apache2_modules_imagemap	Server-side imagemap processing	0
apache2_modules_include	Server-parsed html documents (Server Side Includes)	0
apache2_modules_info	Provides a comprehensive overview of the server configuration	0
apache2_modules_lbmethod_bybusyness	Pending Request Counting load balancer scheduler algorithm for mod_proxy_balancer	0
apache2_modules_lbmethod_byrequests	Request Counting load balancer scheduler algorithm for mod_proxy_balancer	0
apache2_modules_lbmethod_bytraffic	Weighted Traffic Counting load balancer scheduler algorithm for mod_proxy_balancer	0
apache2_modules_lbmethod_heartbeat	Heartbeat Traffic Counting load balancer scheduler algorithm for mod_proxy_balancer	0
apache2_modules_log_config	Logging of the requests made to the server	0
apache2_modules_log_forensic	Forensic Logging of the requests made to the server	0
apache2_modules_logio	Logging of input and output bytes per request	0
apache2_modules_lua	Provides Lua hooks into various portions of the httpd request processing	0
apache2_modules_macro	Macros for the Apache config file	0
apache2_modules_md	Managing domains across virtual hosts, certificate provisioning via the ACME protocol	0
apache2_modules_mime	Associates the requested filename's extensions with the file's behavior (handlers and filters) and content (mime-type, language, character set and encoding)	0
apache2_modules_mime_magic	Determines the MIME type of a file by looking at a few bytes of its contents	0
apache2_modules_negotiation	Provides for content negotiation	0
apache2_modules_proxy	HTTP/1.1 proxy/gateway server	0
apache2_modules_proxy_ajp	AJP support module for mod_proxy	0
apache2_modules_proxy_balancer	mod_proxy extension for load balancing	0
apache2_modules_proxy_connect	mod_proxy extension for CONNECT request handling	0
apache2_modules_proxy_fcgi	FastCGI support module for mod_proxy	0
apache2_modules_proxy_ftp	FTP support module for mod_proxy	0
apache2_modules_proxy_hcheck	Dynamic health check of Balancer members (workers) for mod_proxy	0
apache2_modules_proxy_html	Module to rewrite links in html pages behind a reverse proxy	0
apache2_modules_proxy_http	HTTP support module for mod_proxy	0
apache2_modules_proxy_http2	HTTP2 support module for mod_proxy	0
apache2_modules_proxy_scgi	SCGI gateway module for mod_proxy	0
apache2_modules_proxy_uwsgi	UWSGI gateway module for mod_proxy	0
apache2_modules_proxy_wstunnel	Provides support for the tunnelling of web socket connections to a backend websockets server	0
apache2_modules_ratelimit	Bandwidth Rate Limiting for Clients	0
apache2_modules_remoteip	Replaces the original client IP address for the connection with the useragent IP address list presented by a proxies or a load balancer via the request headers	0
apache2_modules_reqtimeout	Set timeout and minimum data rate for receiving requests	0
apache2_modules_request	Filters to handle and make available HTTP request bodies	0
apache2_modules_rewrite	Provides a rule-based rewriting engine to rewrite requested URLs on the fly	0
apache2_modules_session	Provides support for a server wide per user session interface	0
apache2_modules_session_cookie	Provides support for the storage of user sessions on the remote browser within HTTP cookies	0
apache2_modules_session_crypto	Provides support for the encryption of user sessions before being written to a local database, or written to a remote browser via an HTTP cookie	0
apache2_modules_session_dbd	Provides support for the storage of user sessions within a SQL database using the mod_dbd module	0
apache2_modules_setenvif	Allows the setting of environment variables based on characteristics of the request	0
apache2_modules_slotmem_shm	Slot-based shared memory provider	0
apache2_modules_socache_memcache	A shared object cache provider using memcached	0
apache2_modules_socache_shmcb	A shared object cache provider using a high-performance cyclic buffer inside a shared memory segment	0
apache2_modules_speling	Attempts to correct mistaken URLs that users might have entered by ignoring capitalization and by allowing up to one misspelling	0
apache2_modules_status	Provides information on server activity and performance	0
apache2_modules_substitute	Perform search and replace operations on response bodies	0
apache2_modules_unique_id	Provides an environment variable with a unique identifier for each request	0
apache2_modules_unixd	Basic (required) security for Unix-family platforms	0
apache2_modules_userdir	User-specific directories	0
apache2_modules_usertrack	Clickstream logging of user activity on a site	0
apache2_modules_version	Version dependent configuration	0
apache2_modules_vhost_alias	Provides for dynamically configured mass virtual hosting	0
apache2_modules_watchdog	Provides infrastructure for other modules to periodically run tasks	0
apache2_modules_xml2enc	Enable xml2 encoding module	0
apache2_mpms_event	An experimental variant of the standard worker MPM	0
apache2_mpms_prefork	Implements a non-threaded, pre-forking web server	0
apache2_mpms_worker	Multi-Processing Module implementing a hybrid multi-threaded multi-process web server	0
api	build brltty's application program interface	2
apidoc	Provide doxygen generated API docs.	7
apm	Add APM (Advanced Power Management) support	3
apparmor	Enable support for the AppArmor application security system	18
appindicator	Build in support for notifications using the libindicate or libappindicator plugin	17
aqua	Include support for the Mac OS X Aqua (Carbon/Cocoa) GUI	18
ar	Argentina tv listing grabber	3
archive	Enable archiving plugin via <pkg>app-arch/libarchive</pkg>.	21
argon2	Add support for ARGON2 password schemes	7
arpack	Link with <pkg>sci-libs/arpack</pkg> libraries for eigen decomposition	3
asan	Enable clang's Address Sanitizer functionality. Expect longer compile time.	2
asm	Enable using assembly for optimization	15
aspell	Use aspell instead of ispell in the "spell" plugin for rbot. The vanilla plugin uses ispell, but enabling this flag makes it use the ispell interface from aspell instead.	6
assembly	Build the assembly module to create 3D models composed of several distinguishable parts as a conformed machine.	2
assimp	Use <pkg>media-libs/assimp</pkg> to import assets from 3D files	3
assistant	Build Qt Assistant and the QtHelp module	2
asterisk	Enable the Asterisk plugin.	2
async	Enables asynchronous commands	2
asyncns	Use libasyncns for asynchronous name resolution.	3
athena	Chooses the MIT Athena widget set	4
atm	Enable Asynchronous Transfer Mode protocol support	2
audio	Support using an audio device connected to an IR receiver	3
audiofile	Add support for libaudiofile where applicable	7
audit	Enable support for Linux audit subsystem using sys-process/audit	24
augeas	Enable augeas support	3
automount	Support for automount data in LDAP	2
autostart	Use a custom autostart configuration	3
avahi	Add Support for avahi DNS-SD (zeroconf)	2
avif	Add AV1 Image Format (AVIF) support	16
avx	Enable support for emulating Advanced Vector Extensions (AVX)	3
avx2		4
babeltrace	Enable <pkg>dev-util/babeltrace</pkg> support	3
backlight	Enable backlight control features.	2
backup	Build mariadb-backup which supports SST and hot backup of InnoDB, Aria and MyISAM including compression and encryption	2
barcode	Enable diagrams with <pkg>dev-ruby/rqrcode</pkg> and <pkg>dev-ruby/barby</pkg>	5
base	Enable full support for LibreOffice Base databases (involves additional bundled libs)	2
bash	Symlink to <pkg>app-shells/bash</pkg>	2
bash-completion	Enable bash-completion support	5
bbdb	Include support for <pkg>app-emacs/bbdb</pkg>	5
benchmark	Build a benchmark binary, install it as re2-bench	15
berkdb	Add support for sys-libs/db (Berkeley DB)	42
bfd	Add support for Binary File Descriptor	4
bidi	Enable bidirectional language support	12
big-endian	Big-endian toolchain support	11
bin-symlinks	Symlink executables to usr/bin to be in default PATH (conflicts with crossdev mingw, and crossdev is preferable for a fully featured toolchain)	2
binary	Use pre-built binaries	9
bindist	Flag to enable or disable options for prebuilt (GRP) packages (eg. due to licensing issues)	5
bittorrent	enable bittorrent support	5
blas	Add support for the virtual/blas numerical library	11
bliss	Use <pkg>sci-libs/bliss</pkg> instead of <pkg>sci-mathematics/nauty</pkg> as the backend.	2
blosc	Allow using blosc compression via <pkg>dev-libs/c-blosc2</pkg>	5
blowfish	Compile with blowfish encryption support	2
bluetooth	Enable Bluetooth Support	39
bluray	Enable BluRay metadata support through <pkg>media-libs/libbluray</pkg>	9
bmp	Enable WBMP image loader	3
bogofilter	Install <pkg>mail-filter/bogofilter</pkg> for spam filter support in <pkg>kde-apps/kmail</pkg>	3
boost	Enable support for <pkg>dev-libs/boost</pkg>	20
botan	Enable botan plugin	6
bpf	Enable in Kernel, eBPF (enhanced Berkley Packet Filter) support for managing device controllers.	12
branding	Enable Gentoo specific branding	12
broadway	Enable the GDK Broadway backend.	2
brotli	Enable Brotli compression support	22
browser	Enable communication with web browser plugins	3
bs2b	Enable Bauer Bauer stereophonic-to-binaural headphone filter	6
btrfs	Enables dependencies for the "btrfs" graph driver, including necessary kernel flags.	9
build	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for creating build images and the first half of bootstrapping [make stage1]	6
bullet	Use <pkg>sci-physics/bullet</pkg> for physics plugin	2
bundled-libs	Use the upstream provided bundled libraries.	9
bzip2	Enable bzip2 compression support	64
cacert	Include root/class3 certs from CAcert (https://www.cacert.org/)	2
cache	Enable tags caching support	3
cairo	Enable support for the cairo graphics library	27
caja	Enable engrampa to integrate with <pkg>mate-base/caja</pkg> by providing entries in its context menu	2
calendar	Add support for calendars (not using mcal!)	7
calligra_features_karbon	CALLIGRA_FEATURES option to build vector image editor	0
calligra_features_sheets	CALLIGRA_FEATURES option to build spreadsheet processor	0
calligra_features_stage	CALLIGRA_FEATURES option to build presentation processor	0
calligra_features_words	CALLIGRA_FEATURES option to build word processor	0
cameras_adc65	libgphoto support for adc65 cameras	0
cameras_agfa_cl20	libgphoto support for agfa_cl20 cameras	0
cameras_aox	libgphoto support for aox cameras	0
cameras_ax203	libgphoto support for ax203 cameras	0
cameras_barbie	libgphoto support for barbie cameras	0
cameras_canon	libgphoto support for canon cameras	0
cameras_casio_qv	libgphoto support for casio_qv cameras	0
cameras_clicksmart310	libgphoto support for clicksmart310 cameras	0
cameras_digigr8	libgphoto support for digigr8 cameras	0
cameras_digita	libgphoto support for digita cameras	0
cameras_dimagev	libgphoto support for dimagev cameras	0
cameras_dimera3500	libgphoto support for dimera3500 cameras	0
cameras_directory	libgphoto support for directory cameras	0
cameras_enigma13	libgphoto support for enigma13 cameras	0
cameras_fuji	libgphoto support for fuji cameras	0
cameras_gsmart300	libgphoto support for gsmart300 cameras	0
cameras_hp215	libgphoto support for hp215 cameras	0
cameras_iclick	libgphoto support for iclick cameras	0
cameras_jamcam	libgphoto support for jamcam cameras	0
cameras_jd11	libgphoto support for jd11 cameras	0
cameras_jl2005a	libgphoto support for "American Idol Keychain Camera"	0
cameras_jl2005c	libgphoto support for "American Idol Keychain Camera"	0
cameras_kodak_dc120	libgphoto support for kodak_dc120 cameras	0
cameras_kodak_dc210	libgphoto support for kodak_dc210 cameras	0
cameras_kodak_dc240	libgphoto support for kodak_dc240 cameras	0
cameras_kodak_dc3200	libgphoto support for kodak_dc3200 cameras	0
cameras_kodak_ez200	libgphoto support for kodak_ez200 cameras	0
cameras_konica	libgphoto support for konica cameras	0
cameras_konica_qm150	libgphoto support for konica_qm150 cameras	0
cameras_largan	libgphoto support for largan cameras	0
cameras_lg_gsm	libgphoto support for lg_gsm cameras	0
cameras_mars	libgphoto support for mars cameras	0
cameras_mustek	libgphoto support for mustek cameras	0
cameras_panasonic_coolshot	libgphoto support for panasonic_coolshot cameras	0
cameras_panasonic_dc1000	libgphoto support for panasonic_dc1000 cameras	0
cameras_panasonic_dc1580	libgphoto support for panasonic_dc1580 cameras	0
cameras_panasonic_l859	libgphoto support for panasonic_l859 cameras	0
cameras_pccam300	libgphoto support for pccam300 cameras	0
cameras_pccam600	libgphoto support for pccam600 cameras	0
cameras_pentax	libgphoto support for pentax cameras	0
cameras_polaroid_pdc320	libgphoto support for polaroid_pdc320 cameras	0
cameras_polaroid_pdc640	libgphoto support for polaroid_pdc640 cameras	0
cameras_polaroid_pdc700	libgphoto support for polaroid_pdc700 cameras	0
cameras_ptp2	libgphoto support for ptp2 cameras	0
cameras_ricoh	libgphoto support for ricoh cameras	0
cameras_ricoh_g3	libgphoto support for ricoh_g3 cameras	0
cameras_samsung	libgphoto support for samsung cameras	0
cameras_sierra	libgphoto support for sierra cameras	0
cameras_sipix_blink2	libgphoto support for sipix_blink2 cameras	0
cameras_sipix_web2	libgphoto support for sipix_web2 cameras	0
cameras_smal	libgphoto support for smal cameras	0
cameras_sonix	libgphoto support for sonix cameras	0
cameras_sony_dscf1	libgphoto support for sony_dscf1 cameras	0
cameras_sony_dscf55	libgphoto support for sony_dscf55 cameras	0
cameras_soundvision	libgphoto support for soundvision cameras	0
cameras_spca50x	libgphoto support for spca50x cameras	0
cameras_sq905	libgphoto support for sq905 cameras	0
cameras_st2205	libgphoto support for st2205 cameras	0
cameras_stv0674	libgphoto support for stv0674 cameras	0
cameras_stv0680	libgphoto support for stv0680 cameras	0
cameras_sx330z	libgphoto support for sx330z cameras	0
cameras_topfield	libgphoto support for Topfield PVR5000 cameras	0
cameras_toshiba_pdrm11	libgphoto support for toshiba_pdrm11 cameras	0
cameras_tp6801	libgphoto support for Tenx tp6801 cameras	0
caps	Use Linux capabilities library to control privilege	50
capstone	Enable disassembly support with <pkg>dev-libs/capstone</pkg>	6
cblas	Build with CBLAS <pkg>virtual/cblas</pkg>	2
cdb	Add support for the CDB database engine from the author of qmail	5
cdd	Build the ppl_lcdd program for vertex/facet enumeration accepting the same input format as the programs shipped with <pkg>sci-libs/cddlib</pkg> and <pkg>sci-libs/lrslib</pkg>	2
cdda	Add Compact Disk Digital Audio (Standard Audio CD) support	14
cddb	Access cddb servers to retrieve and submit information about compact disks	7
cdinstall	Copy files from the CD rather than asking the user to copy them, mostly used with games	8
cdio	Enable audio CDs reading via <pkg>dev-libs/libcdio-paranoia</pkg>	6
cdparanoia	Enable cdparanoia (audio CD ripper) support	2
cdr	Add support for CD writer hardware	11
cec	Allows control of CEC enabled TVs via HDMI	3
ceph	Enable <pkg>sys-cluster/ceph</pkg> support	3
cet	Enable Intel Control-flow Enforcement Technology (needs binutils 2.29 and gcc 8)	7
cg	Enable NVidia Cg binding	4
cgal	Adds support for CGAL (<pkg>sci-mathematics/cgal</pkg>)	3
cgi	Add CGI script support	11
cgroup-hybrid	Default to hybrid (legacy) cgroup hierarchy instead of unified (modern).	2
cgroups	Use cgroups to limit /dev access.	2
charts	Build chartshape plugin for creating business charts with <pkg>dev-libs/kdiagram</pkg>	4
chez	build using <pkg>dev-scheme/chez</pkg>	2
chm	Support chm format	4
cholmod	Add test support for CHOLMOD (<pkg>sci-libs/cholmod</pkg>)	2
chromaprint	Enable ChromaPrint / AcoustID support	6
chromecast	Enable Chromecast support using <pkg>dev-python/pychromecast</pkg>	3
chromium	Builds libffmpeg.so to enable media playback in Chromium-based browsers like Opera and Vivaldi.	2
chroot	Compile with chroot support	3
cjk	Add support for Multi-byte character languages (Chinese, Japanese, Korean)	14
clamav	Add support for Clam AntiVirus software (usually with a plugin)	9
clang	Force building using installed clang (rather than the default CC/CXX; required for testing).	26
clang-cuda	Use clang for cuda units compilation	3
classic	Support classic spelling by default	3
cli	Build sexp console application	21
client	Build and install frp client (frpc)	28
clipboard	Enable clipboard support	5
clock	Depend on the clock package for more accurate time measurement	2
cloud	Build the Cloud workbench, to access cloud providers (mostly Amazon S3).	2
cloudproviders	Enable the cloudproviders support	3
cluster	Enable clustering support (allows master-master clsync on multiple hosts). Not fully implemented yet.	3
codec2	Enable codec2 low bit rate speech codec support via <pkg>media-libs/codec2</pkg>	3
collada	Enable DAE file support via <pkg>dev-libs/collada-dom</pkg>	4
collectd_plugins_aggregation	Build the aggregation plugin (aggregates multiplte values into a single value)	0
collectd_plugins_amqp	Build the AMQP output plugin (transmits or receives values collected by collectd via the Advanced Message Queuing Protocol (AMQP))	0
collectd_plugins_apache	Build the apache input plugin (collects statistics from Apache's mod_status module)	0
collectd_plugins_apcups	Build the apcups input plugin (reads various statistics about a connected uninterruptible power supply (UPS))	0
collectd_plugins_ascent	Build the ascent input plugin (reads and parses the statistics page of Ascent)	0
collectd_plugins_battery	Build the battery input plugin (collects the battery's charge, the drawn current and the battery's voltage)	0
collectd_plugins_bind	Build the bind input plugin (collects statistics from bind instances)	0
collectd_plugins_buddyinfo	Build the buddyinfo input plugin (collects statistics from /proc/buddyinfo)	0
collectd_plugins_capabilities	Build the capabilities input plugin (collects platform capabilities decoded from the hardware subsystems)	0
collectd_plugins_ceph	Build the Ceph input plugin (collects statistics from the Ceph distributed storage system)	0
collectd_plugins_cgroups	Build the cgroups input plugin (collects CPU accounting information for processes in a cgroup)	0
collectd_plugins_check_uptime	Build a plugin to notify about uptime reset	0
collectd_plugins_chrony	Build the chrony input plugin (collects statistics from a chrony NTP server)	0
collectd_plugins_connectivity	Build the connectivity input plugin (monitors interface up/down status via netlink library)	0
collectd_plugins_conntrack	Build the conntrack input plugin (tracks the number of entries in Linux's connection tracking table)	0
collectd_plugins_contextswitch	Build the contextswitch input plugin (collects the number of context switches done by the operating system)	0
collectd_plugins_cpu	Build the cpu input plugin (collects the amount of time spent by the CPU in various states)	0
collectd_plugins_cpufreq	Build the cpufreq input plugin (collects the current CPU's frequency)	0
collectd_plugins_cpusleep	Build the cpusleep input plugin (measures time spent by CPU in deep sleep mode)	0
collectd_plugins_csv	Build the csv output plugin (writes to comma separated values (CSV) files)	0
collectd_plugins_curl	Build the curl input plugin (reads streams using net-misc/curl and then parses them according to the configuration)	0
collectd_plugins_curl_json	Build the curl_json input plugin (queries JavaScript Object Notation (JSON) data using net-misc/curl and parses it according to the user's configuration using dev-libs/yajl)	0
collectd_plugins_curl_xml	Build the curl_xml input plugin (reads files using net-misc/curl and parses it as Extensible Markup Language (XML))	0
collectd_plugins_dbi	Build the dbi input plugin (executes SQL statements on databases and reads back the result)	0
collectd_plugins_df	Build the df input plugin (collects file system usage information, i. e. basically how much space on a mounted partition is used and how much is available)	0
collectd_plugins_disk	Build the disk input plugin (collects performance statistics of disks and, where supported, partitions)	0
collectd_plugins_dns	Build the dns input plugin (collects statistics of your DNS traffic on port udp/53 using net-libs/libpcap)	0
collectd_plugins_drbd	Build the Linux's Distributed Replicated Block Device (DRBD) input plugin (reads Linux's DRBD statistics)	0
collectd_plugins_email	Build the email input plugin (opens a UNIX domain socket and starts accepting connections on that socket)	0
collectd_plugins_entropy	Build the entropy input plugin (collects the available entropy on a system)	0
collectd_plugins_ethstat	Build the ethstat input plugin (reads performance statistics directly from ethernet cards)	0
collectd_plugins_exec	Build the exec input/output plugin (executes scripts / applications and reads values back)	0
collectd_plugins_fhcount	Build the file handles input plugin (reports the number of used file handles)	0
collectd_plugins_filecount	Build the filecount input plugin (counts the number of files in a directory and all its subdirectories)	0
collectd_plugins_fscache	Build the fscache input plugin (collects information about the file-system based caching infrastructure for network file-systems and other slow media)	0
collectd_plugins_gps	Build the gps input plugin (collects number of satellites seen by a GPS receiver using sci-geosciences/gpsd)	0
collectd_plugins_gpu_nvidia	Build the NVIDIA GPU input plugin (collects stats from NVIDIA GPU)	0
collectd_plugins_hddtemp	Build the hddtemp input plugin (collects the temperature of disks from hddtemp daemon)	0
collectd_plugins_hugepages	Build the hugepages input plugin (collects the number of used and free hugepages on Linux)	0
collectd_plugins_interface	Build the interface input plugin (collects information about the traffic, packets per second and errors of interfaces)	0
collectd_plugins_ipc	Build the IPC input plugin (collects information related to shared memory)	0
collectd_plugins_ipmi	Build the ipmi input plugin (reads hardware sensors from servers using the Intelligent Platform Management Interface (IPMI))	0
collectd_plugins_iptables	Build the iptables input plugin (collects statistics from a ip_tables based packet filter)	0
collectd_plugins_ipvs	Build the IPVS input plugin (collects statistics from Linux IP Virtual Server)	0
collectd_plugins_irq	Build the irq input plugin (collects the number of times each interrupt has been handled by the operating system)	0
collectd_plugins_java	Build the java input plugin (embeds a JVM into collectd for writing plugins)	0
collectd_plugins_load	Build the load input plugin (collects the system load)	0
collectd_plugins_log_logstash	Build the Logstash output plugin (writes collectd logs and events as Logstash JSON formatted events)	0
collectd_plugins_logfile	Build the logfile output plugin (receives log messages from collectd and writes them to a text file)	0
collectd_plugins_logparser	Build the logparser plugin (allows for filtering and parsing log messages)	0
collectd_plugins_lua	Build the LUA language binding plugin (uses dev-lang/lua) for writing plugins	0
collectd_plugins_madwifi	Build the madwifi input plugin (collects information about Atheros wireless LAN chipsets from the MadWifi driver)	0
collectd_plugins_match_empty_counter	Build the match_empty_counter filter plugin	0
collectd_plugins_match_hashed	Build the match_hashed filter plugin	0
collectd_plugins_match_regex	Build the match_regex filter plugin	0
collectd_plugins_match_timediff	Build the match_timediff filter plugin	0
collectd_plugins_match_value	Build the match_value filter plugin	0
collectd_plugins_mbmon	Build the mbmon input plugin (collects information from mainboard sensors)	0
collectd_plugins_mcelog	Build the mcelog input plugin (subscribes to Machine Check Exceptions (MCE) and dispatches notifications)	0
collectd_plugins_md	Build the md input plugin (reports the number of disks in various states in Linux software RAID devices)	0
collectd_plugins_memcachec	Build the memcachec input plugin (queries one or more given pages from a memcached instance and parses the returned data according to user specification)	0
collectd_plugins_memcached	Build the memcached input plugin (collects statistics from memcached daemon)	0
collectd_plugins_memory	Build the memory input plugin (collects physical memory utilization)	0
collectd_plugins_modbus	Build the Modbus input plugin (reads register values from a Modbus "slave" via Modbus/TCP)	0
collectd_plugins_mqtt	Build the MQTT plugin (sends metrics to and/or receives metrics from an MQTT broker using app-misc/mosquitto)	0
collectd_plugins_multimeter	Build the multimeter input plugin (reads a voltage or current from a multimeter connected to a serial bus)	0
collectd_plugins_mysql	Build the mysql input plugin (collects values from 'SHOW STATUS' command of a MySQL server)	0
collectd_plugins_netlink	Build the netlink input plugin (collects statistics for interfaces, qdiscs, classes and filters using netlink socket)	0
collectd_plugins_network	Build the network input/output plugin (send values to other and/or receive values from from other collectd instances)	0
collectd_plugins_nfs	Build the nfs input plugin (collects information about the usage of the Network File System (NFS))	0
collectd_plugins_nginx	Build the nginx input plugin (collects number of requests handled and the number of current connections by connection state by the nginx daemon)	0
collectd_plugins_notify_desktop	Build the notify_desktop output plugin (uses x11-libs/libnotify to display notifications to the user)	0
collectd_plugins_notify_email	Build the notify_email output plugin (uses net-libs/libesmtp to send notifications to a configured email address)	0
collectd_plugins_notify_nagios	Build the notify_nagios output plugin (sends notifications to Nagios as a passive check result)	0
collectd_plugins_ntpd	Build the ntpd input plugin (collects statistics from a NTP server)	0
collectd_plugins_numa	Build the numa input plugin (collects statistics of the Linux Non-Uniform Memory Access (NUMA) subsystem)	0
collectd_plugins_nut	Build the nut input plugin (collects UPS statistics using the Network UPS Tools)	0
collectd_plugins_olsrd	Build the olsrd input plugin (reads information about the Optimized Link State Routing daemon)	0
collectd_plugins_onewire	Build the onewire (1-Wire) input plugin (collects temperature information from sensors)	0
collectd_plugins_openldap	Build the OpenLDAP input plugin (reads monitoring information from OpenLDAP's cn=Monitor subtree)	0
collectd_plugins_openvpn	Build the openvpn input plugin (reads the status file printed by OpenVPN)	0
collectd_plugins_oracle	Build the oracle input plugin (executes SQL statements against Oracle database systems)	0
collectd_plugins_ovs_events	Build an input plugin which reports link state changes from Open vSwitch (OVS)	0
collectd_plugins_ovs_stats	Build an input plugin which reports bridge and interface statistics from Open vSwitch (OVS)	0
collectd_plugins_pcie_errors	Build an input plugin which reports the PCIe errors	0
collectd_plugins_perl	Build the perl language binding plugin (embeds a Perl interpreter into collectd for writing plugins)	0
collectd_plugins_ping	Build the ping input plugin (measures network latency)	0
collectd_plugins_postgresql	Build the postgresql input plugin (executes SQL statements against a PostgreSQL database)	0
collectd_plugins_powerdns	Build the powerdns input plugin (collects statistics from the PowerDNS name server or recursor via control socket)	0
collectd_plugins_processes	Build the processes input plugin (collects the number of processes, grouped by their state or detailed statistics about selected processes)	0
collectd_plugins_procevent	Build the procevent input plugin (monitors process starts/stops via netlink library)	0
collectd_plugins_protocols	Build the protocols input plugin (collects information about the network protocols supported by the system)	0
collectd_plugins_python	Build the python language binding plugin (embeds a Python interpreter into collectd for writing plugins)	0
collectd_plugins_redis	Build the Redis input plugin (collects usage information from Redis instances)	0
collectd_plugins_routeros	Build the routeros input plugin (collects information from devices running RouterOS)	0
collectd_plugins_rrdcached	Build the rrdcached input/output plugin (connects to rrdcached and submits updates for RRD files)	0
collectd_plugins_rrdtool	Build the rrdtool output plugin (writes values to RRD-files)	0
collectd_plugins_sensors	Build the sensors input plugin (reads hardware sensors from lm-sensors)	0
collectd_plugins_serial	Build the serial input plugin (collects the traffic on serial interfaces)	0
collectd_plugins_sigrok	Build the sigrok input plugin (reads measurements from any supported hardware from sigrok project)	0
collectd_plugins_smart	Build the S.M.A.R.T input plugin (collects S.M.A.R.T statistics from disk drives)	0
collectd_plugins_snmp	Build the snmp input plugin (reads values from network devices using SNMP)	0
collectd_plugins_snmp_agent	Build an input plugin which implements an SNMP AgentX subagent that receives and handles queries from SNMP master agent and returns configured metrics	0
collectd_plugins_statsd	Build the statsd input plugin (accepts statsd-type metrics from a UDP socket)	0
collectd_plugins_swap	Build the swap input plugin (collects amount of memory currently written to swap)	0
collectd_plugins_synproxy	Build the Linux SYNPROXY input plugin (collects metrics from /proc/net/stat/synproxy)	0
collectd_plugins_sysevent	Build the rsyslog input plugin (collects system events from rsyslog)	0
collectd_plugins_syslog	Build the syslog output plugin (receives messages from collectd and dispatches them to syslog)	0
collectd_plugins_table	Build the table input plugin (parses table-like structured plain text)	0
collectd_plugins_tail	Build the tail input plugin (follows logfiles, e.g. tail -f)	0
collectd_plugins_tail_csv	Build the tail_csv input plugin (follows and parses CSV files, e.g. tail -f *.csv)	0
collectd_plugins_target_notification	Build the target_notification filter plugin	0
collectd_plugins_target_replace	Build the target_replace filter plugin	0
collectd_plugins_target_scale	Build the target_scale filter plugin	0
collectd_plugins_target_set	Build the target_set filter plugin	0
collectd_plugins_tcpconns	Build the tcpconns input plugin (collects numbers of TCP connections to or from a specified port)	0
collectd_plugins_teamspeak2	Build the teamspeak2 input plugin (collects traffic statistics from a teamspeak2 instance)	0
collectd_plugins_ted	Build the ted input plugin (connects to The Energy Detective and reads the current power over connected power lines)	0
collectd_plugins_thermal	Build the thermal input plugin (reads ACPI thermal zone information)	0
collectd_plugins_threshold	Build the threshold plugin (checks values against configured thresholds and creates notifications if values are out of bounds)	0
collectd_plugins_turbostat	Build the turbostat input plugin (reads CPU frequency and C-state residency on modern Intel turbo-capable processors)	0
collectd_plugins_ubi	Build the ubi input plugin (collects block state for flash memory devices with UBIFS)	0
collectd_plugins_unixsock	Build the unixsock input/output plugin (opens a UNIX domain socket and accepts connections)	0
collectd_plugins_uptime	Build the uptime input plugin (keeps track of the system uptime)	0
collectd_plugins_users	Build the users input plugin (counts the number of users currently logged into the system)	0
collectd_plugins_uuid	Build the uuid plugin (tries hard to determine the UUID of the system it is running on)	0
collectd_plugins_varnish	Build the varnish input plugin (collects information about Varnish)	0
collectd_plugins_virt	Build the (lib)virt input plugin (collects statistics about virtualized guests on a system)	0
collectd_plugins_vmem	Build the vmem input plugin (collects information about the virtual memory subsystem of the kernel)	0
collectd_plugins_vserver	Build the vserver input plugin (collects information about the virtual servers running on a system, using Linux-Vserver)	0
collectd_plugins_wireless	Build the wireless input plugin (collects signal quality, signal power and signal-to-noise ratio for wireless LAN cards)	0
collectd_plugins_write_graphite	Build the write_graphite output plugin (stores values in Carbon, the storage layer of Graphite)	0
collectd_plugins_write_http	Build the write_http output plugin (sends metrics to a web-server using HTTP POST requests)	0
collectd_plugins_write_influxdb_udp	Build the InfluxDB UDP output plugin (sends metrics to InfluxDB using UDP)	0
collectd_plugins_write_kafka	Build the Kafka output plugin (sends metrics to Apache Kafka)	0
collectd_plugins_write_log	Build the write_log output plugin (writes metrics to a file)	0
collectd_plugins_write_mongodb	Build the MongoDB output plugin (stores values in MongoDB)	0
collectd_plugins_write_prometheus	Builds the Prometheus output plugin (starts an internal webserver on port 9103 (configurable) and accepts scrape requests from Prometheus)	0
collectd_plugins_write_redis	Build the Redis output plugin (stores values in Redis)	0
collectd_plugins_write_sensu	Build the Sensu output plugin (sends metrics to Sensu Core, an open-source monitoring project)	0
collectd_plugins_write_stackdriver	Build the Stackdriver output plugin (stores metrics in Google Stackdriver)	0
collectd_plugins_write_syslog	Build the Syslog output plugin (sends metrics in CEE-enhanced syslog message format)	0
collectd_plugins_write_tsdb	Build the TSDB output plugin (writes metrics to OpenTSDB, an open-source distributed time-series database based on Apache HBase)	0
collectd_plugins_xencpu	Build the XEN CPU input plugin (collects XEN Hypervisor CPU stats using app-emulation/xen-tools)	0
collectd_plugins_zfs_arc	Build the ZFS ARC input plugin (reports information such as the cache size, the various hits and misses (also as a ratio) and the transferred data)	0
collectd_plugins_zookeeper	Build the zookeeper input plugin (reads data from Apache Zookeeper MNTR command)	0
color-management	Enable color management via <pkg>kde-misc/colord-kde</pkg>	3
colord	Support color management using x11-misc/colord	10
common-lisp	Install common-lisp files	2
compat	Build with compatibility interfaces for other crypt implementations	8
compress-xz	Compress firmware using xz (<pkg>app-arch/xz-utils</pkg>) before installation	3
compress-zstd	Compress firmware using zstd (<pkg>app-arch/zstd</pkg>) before installation	3
compute	Adds access to Compute and Auto Scaling related services.	2
concurrent	Build QtConcurrent module	2
connman	Add support for net-misc/connman	3
conntrack	Add support for Linux conntrack connection marking.	2
console	Adds support for line-editing in the console	3
constraints	Enable HTTPS TLS time constraint support	2
context	Add support for the ConTeXt format (<pkg>dev-texlive/texlive-context</pkg>)	3
contrib	Compile and install additional user contribued plugins.	10
control-socket	Enable AF_UNIX control socket support.	4
coreaudio	Build the CoreAudio driver on Mac OS X systems	8
cpu_flags_arm_asimd	Use the Advanced SIMD instructions (NEON with ARMv8 extensions)	0
cpu_flags_arm_asimddp	Use the Advanced SIMD dot product instructions	0
cpu_flags_arm_asimdfhm	Use the Advanced SIMD single- & half-precision multiply	0
cpu_flags_arm_asimdhp	Use the Advanced SIMD half-precision & vector arithmetics	0
cpu_flags_arm_crc32	Use the CRC32 instruction set	3
cpu_flags_arm_edsp	Use the enhanced DSP instructions (ARMv*E and ARMv6+)	0
cpu_flags_arm_i8mm	Use the AArch64 Int8 matrix multiplication instructions	0
cpu_flags_arm_iwmmxt2	Use the iwMMXt2 instruction set	0
cpu_flags_arm_neon	Use the NEON instruction set	34
cpu_flags_arm_neon-fp16	Use the NEON intruction set with half word loads / store support	0
cpu_flags_arm_sm4	Use the SM4 cryptography instruction set	0
cpu_flags_arm_sve2	Use the Scalable Vector Extension 2 instruction set	0
cpu_flags_arm_thumb	Enable Thumb instruction set (ARMv*T and ARMv6+)	2
cpu_flags_arm_thumb2	Enable Thumb-2 instruction set (ARMv*T2 and ARMv7+)	0
cpu_flags_arm_v8	Use instructions added in ARMv8	0
cpu_flags_arm_vfp-d32	Indicate that the FPU has 32 64-bit VFP (v3+) registers (16 otherwise)	0
cpu_flags_arm_vfpv4	Use the VFP version 4 instruction set	0
cpu_flags_ppc_altivec	Use the AltiVec/VMX instruction set	20
cpu_flags_ppc_vsx	Use the Vector Scalar Extension instruction set (POWER7 and later)	2
cpu_flags_ppc_vsx2	Use the Vector Scalar Extension v.2 instruction set (POWER8 and later)	3
cpu_flags_ppc_vsx3	Use the Vector Scalar Extension v.3 instruction set (POWER9 and later)	4
cpu_flags_ppc_vsx4	Use the Vector Scalar Extension v.4 instruction set (POWER10 and later)	0
cpu_flags_x86_3dnow	Use the 3DNow! instruction set	7
cpu_flags_x86_3dnowext	Use the Enhanced 3DNow! instruction set	3
cpu_flags_x86_aes	Enable support for Intel's AES instruction set (AES-NI)	11
cpu_flags_x86_amx_bf16	Use Advanced Matrix Extensions tile computational operations on bfloat16 numbers	0
cpu_flags_x86_amx_int8	Use Advanced Matrix Extensions tile computational operations on 8-bit integers	0
cpu_flags_x86_amx_tile	Use Advanced Matrix Extensions tile architecture support	0
cpu_flags_x86_avx	Adds support for Advanced Vector Extensions instructions	25
cpu_flags_x86_avx2	Adds support for Advanced Vector Extensions 2 instructions	25
cpu_flags_x86_avx512_bf16	Use AVX-512 BFloat16 instruction set	0
cpu_flags_x86_avx512_bitalg	Use AVX-512 Bit Algorithms instruction set	0
cpu_flags_x86_avx512_fp16	Use general-purpose numeric operations for 16-bit half-precision instruction set	0
cpu_flags_x86_avx512_vbmi2	Use AVX-512 Vector Bit Manipulation Instructions 2	0
cpu_flags_x86_avx512_vnni	Use vector neural network instructions for 8- and 16-bit multiply-add operations	0
cpu_flags_x86_avx512_vp2intersect	Use AVX-512 Intersect instruction set	0
cpu_flags_x86_avx512_vpopcntdq	Use AVX-512 Vector Population Count Doubleword and Quadword instruction set	0
cpu_flags_x86_avx512cd	Use AVX-512 conflict detection instructions	0
cpu_flags_x86_avx512f	Adds support for AVX-512 Foundation instructions	7
cpu_flags_x86_avx512ifma	Use AVX-512 Integer Fused Multiply-Add instruction set	0
cpu_flags_x86_avx512vbmi	Use AVX-512 vector byte manipulation instructions	0
cpu_flags_x86_avx_vnni	Use AVX (VEX-encoded) versions of the Vector Neural Network Instructions	0
cpu_flags_x86_bmi1	Enable the first group of advanced bit manipulation extensions (ANDN, BEXTR, BLSI, BLSMSK, BLSR, TZCNT)	0
cpu_flags_x86_bmi2	Enable the second group of advanced bit manipulation extensions (BZHI, MULX, PDEP, PEXT, RORX, SARX, SHLX, SHRX)	0
cpu_flags_x86_f16c	Adds support for F16C instruction set for converting between half-precision and single-precision floats	4
cpu_flags_x86_fma3	Use the Fused Multiply Add 3 instruction set ([fma] in cpuinfo)	6
cpu_flags_x86_fma4	Use the Fused Multiply Add 4 instruction set	6
cpu_flags_x86_mmx	Use the MMX instruction set	27
cpu_flags_x86_mmxext	Use the Extended MMX instruction set (a subset of SSE) ([mmxext] or [sse] in cpuinfo)	2
cpu_flags_x86_padlock	Use VIA padlock instructions ([phe] in cpuinfo)	3
cpu_flags_x86_pclmul	Use Carry-less Multiplication instructions ([pclmulqdq] in cpuinfo)	3
cpu_flags_x86_popcnt	Enable popcnt instruction support ([abm] or [popcnt] in cpuinfo)	4
cpu_flags_x86_rdrand	Use the RDRAND instruction for generating random numbers	3
cpu_flags_x86_sha	Use the SHA-NI instruction set	3
cpu_flags_x86_sse	Use the SSE instruction set	50
cpu_flags_x86_sse2	Use the SSE2 instruction set	74
cpu_flags_x86_sse3	Use the SSE3 instruction set ([pni] in cpuinfo, NOT ssse3)	14
cpu_flags_x86_sse4_1	Enable SSE4.1 instruction support	19
cpu_flags_x86_sse4_2	Enable SSE4.2 instruction support	13
cpu_flags_x86_sse4a	Enable SSE4a instruction support	0
cpu_flags_x86_ssse3	Use the SSSE3 instruction set (NOT sse3/pni)	9
cpu_flags_x86_vpclmulqdq	Use Vector Carry-Less Multiplication of Quadwords instruction set	0
cpu_flags_x86_xop	Enable the XOP instruction set	2
cpudetection	Enables runtime CPU detection (useful for binpkgs, compatibility on other CPUs). This only works on amd64/x86 at present. If this flag is enabled, GMP will work on a variety of amd64/x86 CPUs and load accelerated routines for use at runtime depending on the CPU in use. This makes it suitable for binary packages (binpkgs). If this flag is disabled, GMP will be tuned for the CPU being used at build-time and may not be usable on other machines.	5
cracklib	Support for cracklib strong password checking	5
cron	Adds file to enable hourly cron job to run logcheck"	13
crypt	Add support for encryption -- using mcrypt or gpg where applicable	52
cryptopp	Build algorithms that need Crypto++ support <pkg>dev-libs/crypto++</pkg>	2
cryptsetup	build the zkey-cryptsetup utility (requires USE=openssl)	4
cs		3
css	Enable reading of encrypted DVDs	4
ctags	Enable ctags plugin	2
cuda	Enable NVIDIA CUDA support (computation on GPU)	46
cuda-clang	Use clang for cuda units compilation	4
cudnn	Enable cuDNN usage for tests	3
cue	Enable cue sheet parsing	3
cups	Add support for CUPS (Common Unix Printing System)	33
curl	Add support for client-side URL transfer library	80
curl_quic_ngtcp2	Use ngtcp2	0
curl_quic_openssl	Use OpenSSL	0
curl_ssl_gnutls	Use GnuTLS	4
curl_ssl_openssl	Use OpenSSL	4
custom-cflags	Build with user-specified CFLAGS (unsupported)	25
custom-optimization	Build with user-specified compiler optimizations (-Os, -O0, -O1, -O2, -O3) from CFLAGS	3
custom-tune	Extra long compile time for tuning hardware specific low-level routines	2
cvs	Enable CVS (Concurrent Versions System) integration	2
cxx	Build support for C++ (bindings, extra libraries, code generation, ...)	40
da		3
daap	Enable dmap support through <pkg>net-libs/libdmapsharing</pkg>	2
daemon	Enable the backend caching key daemon	12
dane	Adds support for DNS-based Authentication of Named Entities	2
dap	Support for remote data access with the built-in OPeNDAP client	3
dash	Symlink to <pkg>app-shells/dash</pkg>	2
data	Database abstraction layer to easily send/retrieve data to/from various databases	7
dav1d	Enable support for the dav1d codec decoding	6
dbi	Enable dev-db/libdbi (database-independent abstraction layer) support	7
dbus	Enable dbus support for anything that needs it (gpsd, gnomemeeting, etc)	118
ddcutil	Use <pkg>app-misc/ddcutil</pkg> to query monitor settings	2
de		7
debug	Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces	688
debugger	Install jerry-debugger	6
debuginfod	Enable debuginfod support via <pkg>dev-libs/elfutils</pkg> libdebuginfod	11
dedicated	Add support for dedicated game servers (some packages do not provide clients and servers at the same time)	19
deduplicate	Remove firmware that is also provided by <pkg>sys-kernel/linux-firmware</pkg>	2
default-compiler-rt	Use compiler-rt + libunwind instead of libgcc as the default rtlib for clang	4
default-libcxx	Use libc++ instead of libstdc++ as the default stdlib for clang. Beware: this breaks ABI, producing binaries incompatible with those built with GCC or Clang using libstdc++. Do not set unless you know what you're doing.	3
default-lld	Use lld as the default linker for clang	3
demo	Use the free demo data instead of the full retail game data	6
demos	Install example floppy game files.	2
deploy	Modules required for "deploy" in DBIx::Class::Storage::DBI and "deploymen_statements" in DBIx::Class::Storage::DBI	2
deprecated	Enable deprecated LZMA1 support	15
designer	Build plugins for <pkg>dev-qt/qttools</pkg>[designer]	31
device-mapper	Enable support for device-mapper from <pkg>sys-fs/lvm2</pkg>	6
devtools	Install development tools like bsatool, esmtool and opencs.	3
dga	Add DGA (Direct Graphic Access) support for X	3
dhcp	Enable server support for querying virtual IP addresses for clients from a DHCP server. (IKEv2 only)	3
dia	Add support for diagrams (<pkg>app-office/dia</pkg>)	2
dialogs	Enable "askaccess" dialog box, by using <pkg>x11-libs/gtk+</pkg>	2
dicom	Enable DICOM medical image file support via <pkg>sci-libs/dcmtk</pkg>	3
diet	Compile against <pkg>dev-libs/dietlibc</pkg>	3
diff	Enable diff support	3
discid	Add support for reading disc IDs from audio CDs	3
discord	Enable Discord integration	7
display-manager	Pull in a graphical display manager	2
dist-kernel	Enable subslot rebuilds on Distribution Kernel upgrades	3
djvu	Support DjVu, a PDF-like document format esp. suited for scanned documents	11
dkim	Add DomainKeys Identified Mail support	3
dmenu	Use <pkg>x11-misc/dmenu</pkg> as default. Disable to use a different implementation.	3
dns	Enable DNS resolver via <pkg>net-libs/udns</pkg>	4
dns-over-tls	Enable support for DNS over TLS	2
dnssec	Use <pkg>dev-python/cryptography</pkg> to enable low-level DNSSEC RSA, DSA, ECDSA and EdDSA signature validation.	3
doc	Add extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally	1157
dot	Add support for DOT import (<pkg>media-gfx/graphviz</pkg>)	4
double	Build library for primary data type of double	2
double-precision	more precise calculations at the expense of speed	9
dracut	Install dracut module	3
drafts	Enable draft API support	3
dri	Enable direct rendering: used for accelerated 3D and some 2D, like DMA	4
drm	Use <pkg>x11-libs/libdrm</pkg> for more verbose diagnostics.	18
dtc	Use <pkg>sys-apps/dtc</pkg>	2
dts	Enable DTS Coherent Acoustics decoder support	5
dummy	Build the dummy port driver	2
dv	Enable support for a codec used by many camcorders	4
dvb	Add support for DVB (Digital Video Broadcasting)	12
dvbcsa	use <pkg>media-libs/libdvbcsa</pkg> free implementation of the DVB Common Scrambling Algorithm	2
dvd	Add support for DVDs	8
dvdr	Add support for DVD writer hardware (e.g. in xcdroast)	2
dxr3	Enable support for DXR3 mpeg acceleration cards.	2
dynamic	Support for dynamic loading of backends	2
dynamic-loading	Enable loading of dynamic libraries (modules) at runtime	2
e2fsprogs	Use file flags from <pkg>sys-fs/e2fsprogs</pkg> headers instead of <pkg>virtual/os-headers</pkg> headers	2
ech	Enable Encrypted Client Hello support	2
ecm	Enable support for the GMP-ECM library	4
ed25519	Enable ED25519 verification support via <pkg>dev-libs/nettle</pkg> and <pkg>net-libs/gnutls</pkg>	2
editor	Install wayland-editor example application	9
editorconfig	Use EditorConfig for file settings	2
eds	Enable support for Evolution-Data-Server (EDS)	7
efl	Build <pkg>dev-libs/efl</pkg> based pinentry	2
egl	Enable EGL (Embedded-System Graphics Library, interfacing between windowing system and OpenGL/GLES) support	14
egl-only	Use EGL instead of GLX	2
eigen	Build matrix manipulation with <pkg>dev-cpp/eigen</pkg>	8
el		4
elasticsearch	Build the Elasticsearch output module (requires <pkg>net-misc/curl</pkg>)	2
elf	Enable support for listing and extracting from ELF resource files with gresource tool	5
elfutils	Use libdwfl from <pkg>dev-libs/elfutils</pkg> for frame unwinding support	6
elibc_Cygwin	ELIBC setting for systems that use Cygwin	0
elibc_Darwin	ELIBC setting for systems that use the Darwin C library	0
elibc_SunOS	ELIBC setting for systems that use the Sun Solaris C library	0
elibc_bionic	ELIBC setting for systems that use Android's Bionic C library	0
elibc_glibc	ELIBC setting for systems that use the GNU C library	2
elibc_mingw	ELIBC setting for systems that use the Minimalist GNU for Windows library	0
elibc_musl	ELIBC setting for systems that use the musl C library	0
elogind	Enable session tracking via sys-auth/elogind	50
emacs	Add support for GNU Emacs	83
embed-data-files	Embed data files in binary for relocatable executable.	3
embedded	Embed the definitions of dhcp options in the dhcpcd executable	4
eme-free	Disable EME (DRM plugin) capability at build time	2
emf	EMF export support	2
emoji	Enable emoji loading for CLDR	4
en		3
enca	Enables support for charset discovery and conversion	3
enchant	Enable Enchant backend (using <pkg>app-text/enchant</pkg>) for spelling hinting	6
encode	Add support for encoding of audio or video files	7
eps	Eps image loader support	2
epub	Enable build-in DVI viewer using <pkg>net-libs/webkit-gtk</pkg>	6
es		5
eselect-ldso	Enable runtime library switching by eselect and ld.so.	8
espeak	Adds support for the espeak tts engine	3
ethernet	Enable ethernet emulation	2
evdev	Enable support for input devices via evdev	5
event	Enable the event plugin.	2
eventfd	Allow use of eventfd	3
examples	Install examples, usually source code	564
exec	Enable the exec plugin, to read output from external programs.	4
executable	Build skylighting-extract tool	19
exif	Add support for reading EXIF headers from JPEG and TIFF images	35
expat	Enable the use of dev-libs/expat for XML parsing	14
experimental	Enable experimental features	24
ext2	Enable the ext2 filter via <pkg>sys-fs/e2fsprogs</pkg>.	2
extensions	Build with Extensions module and enable other plugins	3
external-filters	Allow to filter content with scripts and programs. Experimental	2
extra	Install extra packages	10
extras	Install some extra themes	16
f16c		2
f16c:f16c		3
faad	Use <pkg>media-libs/faad2</pkg> for AAC decoding	3
fam	Enable FAM (File Alteration Monitor) support	5
fapi	Enable feature API tools	4
fastcgi	Add support for the FastCGI interface	4
fax	Enables fax support in the courier mail server	3
fbcon	Add framebuffer support for the console, via the kernel	15
fcitx	Enable support for <pkg>app-i18n/fcitx</pkg>	2
fdk	Build with LibFDK AAC support.	7
ffmpeg	Enable ffmpeg/libav-based audio/video codec support	66
ffmpeg-chromium	Use Chromium FFmpeg fork (<pkg>media-video/ffmpeg-chromium</pkg>) rather than mainline FFmpeg (<pkg>media-video/ffmpeg</pkg>)	8
ffmpegthumbnailer	Support for video thumbnail using <pkg>media-video/ffmpegthumbnailer</pkg>	3
fftw	Use FFTW library for computing Fourier transforms	32
fi	Finland tv listing grabber (0.6.1 add ampparit telsu)	4
fifo	Enable FIFO support (sh pipes)	2
file	Use <pkg>sys-apps/file</pkg>	2
filecaps	Use Linux file capabilities to control privilege rather than set*id (this is orthogonal to USE=caps which uses capabilities at runtime e.g. libcap)	7
fileinfo	Enable the File Information extension	2
filter	enable filter signal processing blocks	2
finger	Enable support for the finger protocol	2
fips	Enable FIPS provider	3
firebird	Add support for the Firebird relational database	0
firewalld	DBus interface to iptables/ebtables allowing for better runtime management of your firewall.	4
firmware	Install linux kernel firmware	6
fits	Enable support for NASA's <pkg>sci-libs/cfitsio</pkg> library	9
fixed-point	Enable fixed-point arithmetic operations	3
flac	Add support for FLAC: Free Lossless Audio Codec	62
flatfile	Enable authentication against /etc/passwd-style flat files	2
flatpak	Enable Flatpak support	7
flexiblas	Use <pkg>sci-libs/flexiblas</pkg> as the provider.	5
flint	Add support for <pkg>sci-mathematics/flint</pkg>	5
flite	Enable text-to-speech filter support via <pkg>app-accessibility/flite</pkg>	4
fltk	Add support for the Fast Light Toolkit gui interface	7
fluidsynth	Enable MIDI support with <pkg>media-sound/fluidsynth</pkg> (discouraged)	20
fontconfig	Support for configuring and customizing font access via media-libs/fontconfig	20
fontforge	Use <pkg>media-gfx/fontforge</pkg> to build fonts from source	5
fonts	Use builtin patched copy of open-sans fonts (overrides fontconfig)	4
fortran	Add support for fortran	31
fortune	Enable support for fortune cookies via <pkg>games-misc/fortune-mod</pkg>	2
fpm	Enable the FastCGI Process Manager SAPI	4
fr	France tv listing grabber	7
freeimage	Support images via <pkg>media-libs/freeimage</pkg>	2
freetype	Enable <pkg>media-libs/freetype</pkg> support	6
frei0r	Build the module for <pkg>media-plugins/frei0r-plugins</pkg>	3
fribidi	Enable bidirectional text support	8
frontend	Build "kawa" front-end program using <pkg>sys-libs/readline</pkg>	3
ftdi	Support FTDI devices	7
ftp	Add FTP (File Transfer Protocol) support	6
fuse	Install the <pkg>sys-fs/fuse</pkg> based acngfs, to use a userspace filesystem for the apt cache.	29
fuzzyhash	Support fuzzy hash computations (to detect malware, for example) using the <pkg>app-crypt/ssdeep</pkg> package.	2
g722	Include G.722 codec in the build	4
g729	Include G.729 codec via net-libs/bcg729	4
game	Enable Game music support	2
gamepad	Support using game controllers as input devices	4
games	Builds and installs some extra games	7
gbm	enable GPU-side screencopy (experimental)	4
gc	Enable garbage collection support via <pkg>dev-libs/boehm-gc</pkg>	2
gcr	Enables keystore handling using <pkg>app-crypt/gcr</pkg>	2
gcrypt	Enables strong encryption support	21
gd	Add support for media-libs/gd (to generate graphics on the fly)	18
gdal	Enable alternative terrain engine based on pagedLOD using <pkg>sci-libs/gdal</pkg>	7
gdb	Enable support for the remote GDB stub	3
gdbm	Add support for sys-libs/gdbm (GNU database libraries)	26
gdk-pixbuf	Enable additional image format support via the <pkg>x11-libs/gdk-pixbuf</pkg> library	9
generic	Enable support for generic time radios and GPSDOs	2
generic-uki	Install a generic initramfs and Unified Kernel Image alongside the distribution kernel	0
geoclue	Use enhanced location information from <pkg>app-misc/geoclue</pkg>	4
geoip	Add geoip support for country and city lookup based on IPs	24
geoip2	Add support for geo lookup based on IPs via <pkg>dev-libs/libmaxminddb</pkg>	2
geolocation	Enable physical position determination	12
geos	Enable <pkg>sci-libs/geos</pkg> library support	5
gettext	Use <pkg>sys-devel/gettext</pkg>	2
gflags	Use <pkg>dev-cpp/gflags</pkg> for flag parsing	3
ggi	Add support for media-libs/libggi (non-X video api/drivers)	3
gif	Add GIF image support	48
gimp	Build a plugin for the GIMP	5
git	Enable git (version control system) support	15
gitolite	Set home directory for git hosting via <pkg>dev-vcs/gitolite</pkg> or <pkg>dev-vcs/gitolite-gentoo</pkg>.	2
gkrellm	Enable building of <pkg>app-admin/gkrellm</pkg> module	2
glade	Build support for Glade 3's GtkBuilder implementation	7
gles	Emulate OpenGL 1.3 in terms of OpenGL ES 1.x	3
gles2	Enable GLES 2.0 (OpenGL for Embedded Systems) support (independently of full OpenGL, see also: gles2-only)	16
gles2-only	Use GLES 2.0 (OpenGL for Embedded Systems) or later instead of full OpenGL (see also: gles2)	18
gles3	Enable OpenGL ES 3.x Features.	2
glfw	Build all example files that uses (<pkg>media-libs/glfw</pkg>)	2
glib	Enable <pkg>dev-libs/glib</pkg> support	12
glpk	Add support for glpk (<pkg>sci-mathematics/glpk</pkg>)	9
glusterfs	Enable GlusterFS support via <pkg>sys-cluster/glusterfs</pkg>	5
glut	Build an OpenGL plugin using the GLUT library	5
glx	Enable GLX to interface OpenGL and X11	3
gme	Support various gaming console music formats	10
gmp	Add support for dev-libs/gmp (GNU MP library)	29
gnome	Add GNOME support	25
gnome-keyring	Enable support for storing passwords via gnome-keyring	3
gnome-online-accounts	Enable <pkg>net-libs/gnome-online-accounts</pkg> based Google authentication support	6
gnome-shell	Install <pkg>gnome-base/gnome-shell</pkg> and <pkg>x11-wm/mutter</pkg> for the standard GNOME 3 desktop mode	6
gnumeric	Add support for importing Gnumeric/OpenOffice/MS Excel spreadsheets into LyX.	2
gnuplot	Enable support for gnuplot (data and function plotting)	8
gnutls	Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)	88
go	Build the gccgo plugin to run Go applications.	4
gopher	Enable Gopher protocol support	2
gost	Enable gost algorithm	2
gpg	Enable <pkg>app-crypt/gnupg</pkg> key module	22
gpgme	Enable signatures handling with <pkg>app-crypt/gpgme</pkg>	4
gphoto2	Add digital camera support	8
gpm	Add support for sys-libs/gpm (Console-based mouse driver)	23
gps	Add support for Global Positioning System	7
gpsd_protocols_ashtech	Ashtech protocol support	0
gpsd_protocols_earthmate	Earthmate protocol support	0
gpsd_protocols_evermore	EverMore protocol support	0
gpsd_protocols_fury	Jackson Labs Fury and Firefly support	0
gpsd_protocols_fv18	FV-18 protocol support	0
gpsd_protocols_garmin	Garmin protocol support	0
gpsd_protocols_garmintxt	Garmin Simple Text protocol support	0
gpsd_protocols_geostar	Geostar Protocol support	0
gpsd_protocols_gpsclock	GPSclock protocol support	0
gpsd_protocols_greis	Javad GREIS protocol support	0
gpsd_protocols_isync	Isync protocol support	0
gpsd_protocols_itrax	iTrax protocol support	0
gpsd_protocols_navcom	Navcom protocol support	0
gpsd_protocols_nmea2000	NMEA2000/CAN support	0
gpsd_protocols_oncore	OnCore protocol support	0
gpsd_protocols_sirf	SiRF protocol support	0
gpsd_protocols_skytraq	Skytraq protocol support	0
gpsd_protocols_superstar2	SuperStarII protocol support	0
gpsd_protocols_tnt	True North protocol support	0
gpsd_protocols_tripmate	Tripmate protocol support	0
gpsd_protocols_tsip	Trimble TSIP protocol support	0
gpu	Enable Level0 GPU support in ispcrt.	3
grammar	Build and install grammar language files	2
graph	Create dot graphs in documentations	3
graphics	Add support for several graphics packages (pgf, tikz,...)	2
graphicsmagick	Build and link against GraphicsMagick instead of ImageMagick (requires USE=imagemagick if optional)	14
graphite	Enable <pkg>media-gfx/graphite2</pkg> complementary shaper	2
graphs	Build QtGraphs module	2
graphviz	Add support for the Graphviz library	11
grpc	Install documentation for QtGRPC (unpackaged)	5
grub	Enable grub configuration generator	4
grub_platforms_coreboot	Coreboot platform support	0
grub_platforms_emu	Emulation platform support	0
grub_platforms_ieee1275	IEEE1275 platform support	0
grub_platforms_loongson	MIPS loongson platform support	0
grub_platforms_multiboot	Multiboot platform support	0
grub_platforms_qemu	QEMU platform support	0
grub_platforms_qemu-mips	QEMU MIPS platform support	0
grub_platforms_uboot	U-Boot platform support	0
grub_platforms_xen	XEN (pvgrub2) platform support	0
grub_platforms_xen-32	Build 32-bit XEN (pvgrub2) platform support on amd64	0
grub_platforms_xen-pvh	XEN (pvhgrub2) platform support	0
gsasl	Use GNU SASL via <pkg>net-misc/gsasl</pkg> instead of Cyrus SASL (requires USE=sasl)	2
gsettings	Use gsettings (<pkg>dev-libs/glib</pkg>) to read the system font name	3
gsf	Enable <pkg>gnome-extra/libgsf</pkg> based data extractor and for ODT.	3
gsl	Use the GNU scientific library for calculations	18
gsm	Add support for the gsm lossy speech compression codec	9
gssapi	Include support for RPCSEC GSS	11
gstreamer	Add support for media-libs/gstreamer (Streaming media)	48
gtk	Add support for x11-libs/gtk+ (The GIMP Toolkit)	147
gtk-doc	Build and install gtk-doc based developer documentation for dev-util/devhelp, IDE and offline use	132
gtk2	Install the gtkpinger GUI utility based on <pkg>x11-libs/gtk+</pkg>:2	12
gtk3	Install GTK+3 theme	15
gtk4	Use <pkg>gui-libs/gtk</pkg> for GUI support.	8
gui	Enable support for a graphical user interface	139
guile	Add support for the guile Scheme interpreter	10
guile_single_target_2-2	Build only for GNU Guile 2.2.	0
guile_single_target_3-0	Build only for GNU Guile 3.0.	0
guile_targets_2-2	Build with GNU Guile 2.2	0
guile_targets_3-0	Build with GNU Guile 3.0	0
gzip	Compress files with Lempel-Ziv coding (LZ77)	3
gzip-el	Compress bundled Emacs Lisp source	2
handbook	Enable handbooks generation for packages by KDE	0
hardened	Activate default security enhancements for toolchain (gcc, glibc, binutils)	24
hardlink	build hardlink program	3
harfbuzz	Use <pkg>media-libs/harfbuzz</pkg> as text shaping engine	10
hddtemp	Enable monitoring of hdd temperature (app-admin/hddtemp)	5
hdf	Build hdf to hdf5 (and vice-versa) converter	5
hdf5	Add support for the Hierarchical Data Format v5	28
he		2
headers-only	Install only C headers instead of whole package. Mainly used by sys-devel/crossdev for toolchain bootstrap.	9
headless	Include the headless variant of the emulator	3
headless-awt	Don't install the X backend for AWT, needed by some GUIs (used to be X flag)	4
heif	Enable support for ISO/IEC 23008-12:2017 HEIF/HEIC image format	21
help	Build QtHelp module	6
hidapi	Use <pkg>dev-libs/hidapi</pkg> instead of <pkg>virtual/libusb</pkg> for talking to the device (advertised to be faster)	4
highlight	Enable syntax highlighting for certain plugins	6
hip	Enable AMD HIP support (computation on GPU)	6
hires	Support hi-resolution textures (requires <pkg>dev-libs/boost</pkg>)	2
homed	Enable portable home directories	2
hostname	Enable hostname	3
hscolour	Include coloured haskell sources to generated documentation (dev-haskell/hscolour)	0
html	Install HTML documentation	15
http	Install <pkg>dev-perl/libwww-perl</pkg> required for monitoring HTTP-based services such as Apache and nginx. Disabling the flag does not remove any plugin file.	23
http-client	Build support for HTTP client using <pkg>net-misc/curl</pkg>	2
http-server	Build support for HTTP server using <pkg>net-libs/libmicrohttpd</pkg>	3
http2	Enable support for the HTTP/2 protocol	10
http3	Install <pkg>net-libs/nghttp3</pkg> for enhanced HTTP3 analysis	3
httpd	Enable the HTTP/WebSockets server to display images	5
httpserver	Build QtHttpServer module	2
hu		4
hunspell	Enable <pkg>app-text/hunspell</pkg> spellchecking and morphological analysis	5
hwaccel	Force-enable hardware-accelerated rendering (Mozilla bug 594876)	2
hwloc	Enable CPU affinity support via hwloc	7
hybrid	Enable support for hybrid vaapi hardware acceleration on Intel Haswell and newer architectures	2
hyperscan	Enable high-performance regex matching with Hyperscan	2
hypre	Build with <pkg>sci-libs/hypre</pkg> conditioners	3
ibm	Add support for IBM ppc64 specific systems	4
ibus	Enable Intelligent Input Bus	9
ical	Enable support for <pkg>dev-libs/libical</pkg>	3
ico	Enable ico support via <pkg>media-gfx/icoutils</pkg>	2
icons	Enable support for icons in menus	8
iconv	Enable support for the iconv character set conversion library	30
icu	Enable ICU (Internationalization Components for Unicode) support, using dev-libs/icu	37
id	Whether report *.bind CHAOS info to clients, otherwise forward such requests upstream instead	4
ident	Enable support for the mod_ident module	2
idn	Enable support for Internationalized Domain Names	38
ieee-long-double	Use accelerated 128-bit IEEE long double ABI (ppc64le only)	2
ieee1394	Enable FireWire/iLink IEEE1394 support (dv, camera, ...)	7
ilbc	Enable the Internet Low Bitrate Codec (iLBC)	4
image	Install the <pkg>media-gfx/ristretto</pkg> image viewer.	4
imagemagick	Enable optional support for the ImageMagick or GraphicsMagick image converter	31
imagequant	Build with Image Quantization Library support	2
imaging	Add support for <pkg>dev-python/pillow</pkg>	2
imap	Add support for IMAP (Internet Mail Application Protocol)	5
imlib	Add support for imlib, an image loading and rendering library	8
index64	Enable 64-bit array indexing support	12
infiniband	Enable Infiniband RDMA transport support	3
ini	Install <pkg>dev-perl/Config-Tiny</pkg> to support decoding INI config files	2
initramfs	Include kernel modules in the initramfs, and re-install the kernel (only effective for distribution kernels)	5
inotify	Enable inotify filesystem monitoring support	10
input_devices_joystick	INPUT_DEVICES setting to build driver for joystick input devices	2
input_devices_libinput	INPUT_DEVICES setting to build driver for libinput input devices	2
input_devices_wacom	INPUT_DEVICES setting to build driver for wacom input devices	9
int-quality	Use rounding instead of fast truncation for integer output, where possible	2
int64	Use 64 bit indexes	8
interlaced	enable interlaced encoding support, this can decrease encoding speed by up to 2%	2
introspection	Add support for GObject based introspection	180
io-uring	Enable the use of io_uring for efficient asynchronous IO and system requests	14
iodbc	Add support for iODBC library	9
ios	Enable support for Apple's iDevice with iOS operating system (iPad, iPhone, iPod, etc)	6
ipc	Add support for Inter-Process Messaging	4
ipmi	Build support for collecting some ipmi stats	4
iptables	include support for iptables filtering	4
ipv6	Add support for IP version 6	84
ipython	Add support for <pkg>dev-python/ipython</pkg>	2
irc	Enable support for displaying everything from an irc channel using <pkg>net-libs/libircclient</pkg>	6
irda	Enables infrared support	3
iso	Install <pkg>app-cdr/cdrtools</pkg> in order to prepare iso images	8
ispc	Enable ispc backend	2
it	Italy tv listing grabber (RUV)	7
ja		2
jack	Add support for the JACK Audio Connection Kit	86
jaeger	Include the jaeger exporter	2
jansson	Enable JSON data manipulation via <pkg>dev-libs/jansson</pkg>	3
java	Add support for Java	51
javascript	Enable javascript support	10
jbig	Enable jbig-kit support for tiff, Hylafax, ImageMagick, etc	7
jemalloc	Use dev-libs/jemalloc for memory management	18
jit	Enable just-in-time compilation for improved performance. May prevent use of some PaX memory protection features in Gentoo Hardened.	24
joystick	Add support for joysticks in all packages	11
jpeg	Add JPEG image support	119
jpeg2k	Support for JPEG 2000, a wavelet-based image compression format	23
jpegxl	Add JPEG XL image support	26
json	Add support for json-persing via json-c	31
judy	Build Judy-based (<pkg>dev-libs/judy</pkg>) plugin implementing fast "exact" and especially "lev" strategies	2
jumbo-build	Combine source files to speed up build process.	5
jupyter	Add support for jupyter notebook	3
kafka	Build the Apache Kafka input/output module (requires <pkg>dev-libs/librdkafka</pkg>)	5
kate	Adds support for Ogg Kate subtitles via libkate.	3
kde	Add support for software made by KDE, a free software community	21
kdesu	Run as root using kdesu from <pkg>kde-plasma/kde-cli-tools</pkg>	2
kerberos	Add kerberos support	74
kernel	Enable kernel interface for PPPoL2TP	2
kernel_Darwin	KERNEL setting for system using the Darwin kernel (i.e.: Mac OS X).	0
kernel_Hurd	KERNEL setting for system using the GNU Hurd	0
kernel_SunOS	KERNEL setting for system using an SunOS (i.e.: Solaris) kernel	0
kernel_Winnt	KERNEL setting for systems on Windows (Cygwin, MinGW, Winnt, ...)	0
kernel_linux	KERNEL setting for system using the Linux kernel	3
keybinder	Enable support for global hotkeys using <pkg>dev-libs/keybinder</pkg>	4
keyboard	Enable key event translation with XKB and build keyboard engine	2
keyring	Enable support for freedesktop.org Secret Service API password store	32
keyutils	Stress test the kernel's key generation facilities via <pkg>sys-apps/keyutils</pkg>	4
kill	Enable support removing data via the API (dangerous)	4
kiosk	Enable the kiosk shell	2
klu	Add support for KLU (<pkg>sci-libs/klu</pkg>)	3
kmem	Enable Kernel Memory Accounting.	2
kmod	Enable kernel module loading via <pkg>sys-apps/kmod</pkg>	5
ko		4
ktls	Enable support for Kernel implementation of TLS (kTLS)	2
kvazaar	Enable H.265/HEVC encoding support via <pkg>media-libs/kvazaar</pkg>	3
kwallet	Enable encrypted storage of passwords with <pkg>kde-frameworks/kwallet</pkg>	8
kyotocabinet	Enable Kyoto Cabinet database backend for header caching	2
l0	Install the oneAPI Level Zero driver alongside the OpenCL one	2
l10n_		17
l10n_${X}		3
l10n_ach	Acoli	0
l10n_af	Afrikaans	0
l10n_am	Amharic	0
l10n_an	Aragonese	0
l10n_ar	Arabic	0
l10n_as	Assamese	0
l10n_ast	Asturian	0
l10n_az	Azerbaijani	0
l10n_be	Belarusian	0
l10n_bea	Beaver	0
l10n_bg	Bulgarian	0
l10n_bn	Bengali	0
l10n_bn-IN	Bengali (India)	0
l10n_bo	Tibetan	0
l10n_br	Breton	0
l10n_brx	Bodo (India)	0
l10n_bs	Bosnian	0
l10n_ca	Catalan	2
l10n_ca-valencia	Catalan (Valencian)	0
l10n_cak	Kaqchikel	0
l10n_ceb	Cebuano	0
l10n_ch	Chamorro	0
l10n_chr	Cherokee	0
l10n_ckb	Central Kurdish	0
l10n_co	Corsican	0
l10n_cop	Coptic	0
l10n_cs	Czech	4
l10n_csb	Kashubian	0
l10n_cu	Church Slavic	0
l10n_cy	Welsh	0
l10n_da	Danish	0
l10n_de	German	18
l10n_de-1901	German (traditional orthography)	0
l10n_de-AT	German (Austria)	0
l10n_de-CH	German (Switzerland)	0
l10n_de-DE	German (Germany)	0
l10n_dgo	Dogri (individual language)	0
l10n_doi	Dogri (macrolanguage)	0
l10n_dsb	Lower Sorbian	0
l10n_dv	Dhivehi	0
l10n_dz	Dzongkha	0
l10n_el	Modern Greek	0
l10n_en	English	9
l10n_en-AU	English (Australia)	0
l10n_en-CA	English (Canada)	0
l10n_en-US	English (United States)	0
l10n_en-ZA	English (South Africa)	0
l10n_eo	Esperanto	0
l10n_es	Spanish	11
l10n_es-419	Spanish (Latin America)	0
l10n_es-AR	Spanish (Argentina)	0
l10n_es-CL	Spanish (Chile)	0
l10n_es-ES	Spanish (Spain)	0
l10n_es-MX	Spanish (Mexico)	0
l10n_es-PE	Spanish (Peru)	0
l10n_et	Estonian	0
l10n_eu	Basque	0
l10n_fa	Persian	0
l10n_ff	Fulah	0
l10n_fi	Finnish	2
l10n_fil	Filipino	0
l10n_fo	Faroese	0
l10n_fr	French	14
l10n_fr-CA	French (Canada)	0
l10n_fur	Friulian	0
l10n_fy	Western Frisian	0
l10n_ga	Irish	0
l10n_gd	Scottish Gaelic	0
l10n_gez	Geez	0
l10n_gl	Galician	0
l10n_gn	Guarani	0
l10n_got	Gothic	0
l10n_grc	Ancient Greek (to 1453)	0
l10n_gu	Gujarati	0
l10n_gug	Paraguayan Guarani	0
l10n_gv	Manx	0
l10n_he	Hebrew	3
l10n_hi	Hindi	0
l10n_hil	Hiligaynon	0
l10n_hr	Croatian	0
l10n_hsb	Upper Sorbian	0
l10n_ht	Haitian	0
l10n_hu	Hungarian	2
l10n_hus	Huastec	0
l10n_hy	Armenian	0
l10n_ia	Interlingua	0
l10n_io	Ido	0
l10n_is	Icelandic	0
l10n_it	Italian	12
l10n_iu	Inuktitut	0
l10n_ja	Japanese	24
l10n_jbo	Lojban	0
l10n_jv	Javanese	0
l10n_ka	Georgian	0
l10n_kab	Kabyle	0
l10n_kek	Kekchí	0
l10n_kk	Kazakh	0
l10n_km	Central Khmer	0
l10n_kmr	Northern Kurdish	0
l10n_kmr-Latn	Northern Kurdish (Latin script)	0
l10n_kn	Kannada	0
l10n_ko	Korean	4
l10n_kok	Konkani (macrolanguage)	0
l10n_kpg	Kapingamarangi	0
l10n_ks	Kashmiri	0
l10n_ktu	Kituba (Democratic Republic of Congo)	0
l10n_ku	Kurdish	0
l10n_ky	Kirghiz	0
l10n_la	Latin	0
l10n_lb	Luxembourgish	0
l10n_lij	Ligurian	0
l10n_ln	Lingala	0
l10n_lo	Lao	0
l10n_lt	Lithuanian	0
l10n_lv	Latvian	0
l10n_mai	Maithili	0
l10n_mg	Malagasy	0
l10n_mi	Maori	0
l10n_mk	Macedonian	0
l10n_ml	Malayalam	0
l10n_mn	Mongolian	0
l10n_mni	Manipuri	0
l10n_mr	Marathi	0
l10n_ms	Malay (macrolanguage)	0
l10n_mt	Maltese	0
l10n_my	Burmese	0
l10n_nan	Min Nan Chinese	0
l10n_nb	Norwegian Bokmål	0
l10n_nd	North Ndebele	0
l10n_nds	Low German	0
l10n_ne	Nepali	0
l10n_nl	Dutch	4
l10n_nn	Norwegian Nynorsk	0
l10n_nr	South Ndebele	0
l10n_nso	Northern Sotho	0
l10n_ny	Chichewa	0
l10n_oc	Occitan	0
l10n_om	Oromo	0
l10n_or	Oriya (macrolanguage)	0
l10n_pa	Punjabi	0
l10n_pl	Polish	6
l10n_pon	Pohnpeian	0
l10n_pot	Potawatomi	0
l10n_ppk	Uma	0
l10n_prs	Dari	0
l10n_ps	Pushto	0
l10n_pt	Portuguese	2
l10n_pt-PT	Portuguese (Portugal)	0
l10n_qu	Quechua	0
l10n_rm	Romansh	0
l10n_rmq	Caló	0
l10n_ro	Romanian	0
l10n_ru	Russian	9
l10n_rw	Kinyarwanda	0
l10n_sa	Sanskrit	0
l10n_sat	Santali	0
l10n_sc	Sardinian	0
l10n_sco	Scots	0
l10n_sd	Sindhi	0
l10n_si	Sinhala	0
l10n_sid	Sidamo	0
l10n_sk	Slovak	0
l10n_skr	Saraiki	0
l10n_sml	Central Sama	0
l10n_sn	Shona	0
l10n_so	Somali	0
l10n_son	Songhai languages	0
l10n_sr	Serbian	0
l10n_sr-Latn	Serbian (Latin script)	0
l10n_ss	Swati	0
l10n_st	Southern Sotho	0
l10n_su	Sundanese	0
l10n_sv	Swedish	2
l10n_sw	Swahili (macrolanguage)	0
l10n_sw-TZ	Swahili (Tanzania)	0
l10n_syc	Classical Syriac	0
l10n_syr	Syriac	0
l10n_szl	Silesian	0
l10n_ta	Tamil	0
l10n_te	Telugu	0
l10n_tet	Tetum	0
l10n_tg	Tajik	0
l10n_th	Thai	0
l10n_ti	Tigrinya	0
l10n_tk	Turkmen	0
l10n_tl	Tagalog	0
l10n_tlh	Klingon	0
l10n_tn	Tswana	0
l10n_to	Tonga (Tonga Islands)	0
l10n_tr	Turkish	0
l10n_trs	Chicahuaxtla Triqui	0
l10n_ts	Tsonga	0
l10n_tsg	Tausug	0
l10n_tt	Tatar	0
l10n_ug	Uyghur	0
l10n_ur	Urdu	0
l10n_uz	Uzbek	0
l10n_ve	Venda	0
l10n_vec	Venetian	0
l10n_vi	Vietnamese	0
l10n_vls	Vlaams	0
l10n_wa	Walloon	0
l10n_xh	Xhosa	0
l10n_yi	Yiddish	0
l10n_yo	Yoruba	0
l10n_zh	Chinese	5
l10n_zh-CN	Chinese (China)	5
l10n_zh-TW	Chinese (Taiwan)	3
l10n_zu	Zulu	0
ladspa	Enable the ability to support ladspa plugins	12
lame	Add support for MP3 encoding using LAME	13
landlock	Use Landlock to restrict what the monitor API handlers can do on the system	2
lapack	Add support for the virtual/lapack numerical library	19
large-stack	Enables code to take advantage of large stack support	2
largefile	Enables support for large files	4
lash	Add LASH Audio Session Handler support	9
latex	Add support for LaTeX (typesetting package)	14
launcher	Install FLTK-based launcher that you probably don't need	11
lcd_devices_acoolsdcm	Add support for Alphacool USB display modules	0
lcd_devices_astusb	Add support for ASTUSB LCD modules	0
lcd_devices_bayrad	Add support for BayRAD LCD modules by EMAC	0
lcd_devices_beckmannegle	Add support for Beckmann+Egle "Mini Terminals" and "Compact Terminals"	0
lcd_devices_bwct	Add support for BWCT USB LCD displays	0
lcd_devices_cfontz	Add support for CrystalFontz displays	0
lcd_devices_cfontzpacket	Add support for CrystalFontz chipsets CFA-631, CFA-633 and CFA-635	0
lcd_devices_crystalfontz	Add support for modern Crystalfontz display modules	0
lcd_devices_curses	Add support for a ncurses based virtual display	0
lcd_devices_cwlinux	Add support for serial / USB displays CW12232 and CW1602 by CwLinux	0
lcd_devices_cwlnx	Add support for serial / USB displays CW12232 and CW1602 by CwLinux	0
lcd_devices_d4d	Add support for 4D Systems display graphics modules with SGC PmmC	0
lcd_devices_ddusbt	Add support for DD usb touch screen	0
lcd_devices_directgfx	Add support for output via SDL	0
lcd_devices_displaylink	Add support for displaylink based LCDs	0
lcd_devices_dpf	Add support for DPF display modulees	0
lcd_devices_dpfax	Add support for AX206 photo frames	0
lcd_devices_ea232graphic	Add support for the Electronic Assembly RS232 graphic driver	0
lcd_devices_ea65	Add support for the VFD in the AOpen XC Cube-AV EA65 media barebone	0
lcd_devices_efn	Add support for the English Font display Network based displays	0
lcd_devices_eyeboxone	Add support for the displays on Rightvision's EyeboxOne server	0
lcd_devices_framebuffer	Add support for output on a framebuffer	0
lcd_devices_futaba	Add support for Futaba M402SD06GL display module	0
lcd_devices_futabavfd	Add support for Futaba M402SD06GL display module	0
lcd_devices_fw8888	Add support for the Allnet FW8888 firewall appliance LCD	0
lcd_devices_g15	Add support for Logitech G15 Keyboard LCDs	0
lcd_devices_glcd2usb	Add support for GLCD2USB LCD module	0
lcd_devices_glcdlib	Add support for LCDs, which are supported by graphlcd-base	0
lcd_devices_glk	Add support for MatrixOrbital GLK chipset	0
lcd_devices_goldelox	Add support for Goldelox MD1 display modules	0
lcd_devices_i2500vfd	Add support for the Intra2net Intranator 2500 VFD display	0
lcd_devices_i2c	Add generic support for i2c based modules	0
lcd_devices_icp_a106	Add support for ICP A106 alarm/LCD boards for 19" racks	0
lcd_devices_imon	Add support for Soundgraph/Ahanix/Silverstone/Uneed/Accent iMON IR/VFD modules (Antec Fusion)	0
lcd_devices_imonlcd	Add support for Soundgraph iMON LCD modules (Antec Fusion)	0
lcd_devices_iowarrior	Add support for IO-Warrior displays	0
lcd_devices_irlcd	Add support for the USBtiny DIY USB to IR receiver	0
lcd_devices_irman	Add support for the IrMan IR remote	0
lcd_devices_irtrans	Add support for the 16x2 IRTrans VFD device	0
lcd_devices_joy	Add support for the joystick input driver, used on various LCD keypads	0
lcd_devices_jw002	Add support for PJRC JW002 24x8 LCD display	0
lcd_devices_ks0108	Add support for KS0108 based graphical LCDs	0
lcd_devices_l4m	Add support for Linux4Media displays	0
lcd_devices_lb216	Add support for RTN's LB216 display	0
lcd_devices_lc7981	Add support for the DG-16080 display family	0
lcd_devices_lcd2usb	Add support for the open lcd2usb connector to hd44780 displays	0
lcd_devices_lcdm001	Add support for the Kernelconcepts LCDM001 display	0
lcd_devices_lcdterm	Add support for LCDTerm serial-to-HD44780 adapter boards	0
lcd_devices_lcterm	Add support for Neumark's LCTerm serial LCD	0
lcd_devices_ledmatrix	Add support for SLM1606/8 LED Matrix displays	0
lcd_devices_lh155	Add support for Sharp LH155 based displays	0
lcd_devices_linux_input	Add support for the linux event device for inputting data from the input.	0
lcd_devices_lirc	Add support for various IR remotes supported by LIRC	0
lcd_devices_lis	Add support for the VLSystem L.I.S MCE 2005 VFD	0
lcd_devices_lph7508	Add support for the Pollin LPH7508	0
lcd_devices_luise	Add support for the Wallbraun Electronics LCD-USB-Interface to Hitachi SP14Q002	0
lcd_devices_lw_abp	Add support for the LW_ABP display module	0
lcd_devices_m50530	Add support for M50530 and compatible displays	0
lcd_devices_matrixorbital	Add support for Matrix Orbital LCDs	0
lcd_devices_matrixorbitalgx	Add support for Matrix Orbital graphical LCDs	0
lcd_devices_md8800	Add support for the VFD of the Medion MD8800 PC	0
lcd_devices_mdm166a	Add support for the Futaba / Targa USB Graphic Vacuum Fluorescent Display	0
lcd_devices_milfordinstruments	Add support for Milford Intruments LCDs	0
lcd_devices_ms6931	Add support for MSI-6931 displays in MSI rack servers	0
lcd_devices_mtc_s16209x	Add support for MTC_S16209x displays	0
lcd_devices_mtxorb	Add support for Matrix Orbital LCD* LKD* VFD* and VKD* displays	0
lcd_devices_mx5000	Add support for the Logitech MX5000 keyboard with an integrated LCD	0
lcd_devices_newhaven	Add support for various Newhaven displays	0
lcd_devices_nokcol	Add support for Nokias 3510i and 3530 display modules	0
lcd_devices_noritake	Add support for the Noritake GU128x32-311 graphical display	0
lcd_devices_noritakevfd	Add support for the Noritake VFD Device CU20045SCPB-T28A	0
lcd_devices_null	Add support for a NULL driver (for testing)	0
lcd_devices_olimex_mod_lcd1x9	Add support for the Olimex MOD-LCD1x9 LCD display	0
lcd_devices_pcd8544	Add support for PCD8544 and compilant display modules	0
lcd_devices_pertelian	Add support for the Pertelian X2040 displays	0
lcd_devices_phanderson	Add support for the PHAnderson serial-to-HD44780 controller	0
lcd_devices_picgraphic	Add support for PIC graphic displays	0
lcd_devices_picolcd	Add support for Mini-Box's picoLCD	0
lcd_devices_picolcdgraphic	Add support for Mini-Box's graphical picoLCD	0
lcd_devices_png	Add support for PNG output	0
lcd_devices_ppm	Add support for PNG output	0
lcd_devices_pyramid	Add support for the Pyramid LCD device	0
lcd_devices_rawserial	Add suppor for the rawserial interface on hd44780 LCD displays	0
lcd_devices_remote	Add suport for remote display modules	0
lcd_devices_routerboard	Add support for the Router Board LCD port	0
lcd_devices_rs232	Add support for generic RS232 based displays	0
lcd_devices_sample	Add support for the sample driver	0
lcd_devices_samsungspf	Add support for Samsung SPF displays	0
lcd_devices_sdeclcd	Add support for Watchguard FireBox firewall appliances displays	0
lcd_devices_sed1330	Add support for Seiko Epson SED1330/1335 graphical displays (S1D13300/S1D13305)	0
lcd_devices_sed133x	Add support for SED133x based display modules	0
lcd_devices_sed1520	Add support for the Seiko Epson SED1520 Controller	0
lcd_devices_sed153x	Add support for OPTREX 323 based display modules	0
lcd_devices_sed156x	Add support for Nokias 7110 display module	0
lcd_devices_serdisplib	Meta-driver to support drivers via dev-libs/serdisplib	0
lcd_devices_serialpos	Add support for character displays in serial point of sale ("POS") devices	0
lcd_devices_serialvfd	Add support for most NEC, Futaba and Noritake VFDs	0
lcd_devices_shuttlevfd	Add support for several Shuttle VFDs such as M1000, M2000, G5 3300m and SG33G5M	0
lcd_devices_simplelcd	Add support for a simple serial terminal display	0
lcd_devices_sli	Add support for a Wirz SLI display	0
lcd_devices_ssdoled	Add support for Bolymin BL160128A OLED display	0
lcd_devices_stv5730	Add support for STV5730A on-screen display chips	0
lcd_devices_stv8105	Add support for STV8105 on-screen display chips	0
lcd_devices_sureelec	Add support drivers from the 'SURE electronics' shop	0
lcd_devices_t6963	Add support for Toshiba T6963 based LCD displays	0
lcd_devices_teaklcm	Add support for TeakLCM displays	0
lcd_devices_text	Add support for TextMode displaying	0
lcd_devices_trefon	Add support for Trefon USB LCD displays	0
lcd_devices_tyan	Add support for LCDs of the Barebone GS series	0
lcd_devices_ula200	Add support for ULA200 USB devices that allow USB connection of HD44780s	0
lcd_devices_usbhub	Add support for USBHUB displays	0
lcd_devices_usblcd	Add support for USBLCD displays	0
lcd_devices_vlsys_m428	Add support for MonCaso 320 LCD displays	0
lcd_devices_vssdcp	Add support for network-based vssdcp protocol LCD displays	0
lcd_devices_wincornixdorf	Add support for the WincorNixdorf serial cashier displays BA63 and BA66	0
lcd_devices_x11	Add support for X11 displaying	0
lcd_devices_xosd	Add support for xosdlib	0
lcd_devices_yard2lcd	Add support for the Y.A.R.D. 2 LCD display and remote	0
lcms	Add lcms support (color management engine)	31
ldap	Add LDAP support (Lightweight Directory Access Protocol)	76
led	Synchronizes device LEDs with the Plasma accent color (ultimately requires rust)	2
legacy	Enable or disable building legacy code (3.0 compatible)	4
lerc	Add LERC suppport (Limited Error Raster Compression)	3
leveldb	Enable LevelDB backend	2
lfs	Support large files (&gt;2GB) on 32-bit systems	2
libaom	Enable AV1 de/encoding via <pkg>media-libs/libaom</pkg>.	3
libarchive	Symlink to bsdtar from <pkg>app-arch/libarchive</pkg>	4
libass	SRT/SSA/ASS (SubRip / SubStation Alpha) subtitle support	5
libatomic	Use libatomic instead of builtin atomic operations	2
libbsd	Use strlcpy() from <pkg>dev-libs/libbsd</pkg> instead of internal implementation.	2
libcaca	Add support for colored ASCII-art graphics	8
libcanberra	Enable support for <pkg>media-libs/libcanberra</pkg>	7
libconfig	Require <pkg>dev-libs/libconfig</pkg> to allow the daemon to read a configuration file at startup	2
libcxx	Install <pkg>llvm-runtimes/libcxx</pkg> for -stdlib=libc++	5
libdeflate	Use <pkg>app-arch/libdeflate</pkg> rather than <pkg>virtual/zlib</pkg> for lazy-loaded R objects.	5
libdispatch	Use <pkg>dev-libs/libdispatch</pkg> to speed up concurrent code execution	3
libdovi	Use <pkg>media-libs/libdovi</pkg> to read Dolby Vision metadata	2
libdrm	Enable kernel mode setting video output plugin via <pkg>x11-libs/libdrm</pkg>	2
libedit	Use the libedit library (replacement for readline)	23
libei	Enable emulated input using <pkg>dev-libs/libei</pkg>	2
libev	Support event loops via <pkg>dev-libs/libev</pkg>	4
libevent	Use libevent for event handling	11
libffi	Enable support for Foreign Function Interface library	4
libguestfs	Use <pkg>app-emulation/libguestfs</pkg>	2
libinput	Enable support for input devices via <pkg>dev-libs/libinput</pkg>	3
liblc3	Enable LC3-SWB audio support for HFP	4
libmount	Link mount.nfs with libmount	2
libmpv	Build DVD player using libmpv	3
libnet	Include code requiring <pkg>net-libs/libnet</pkg>	3
libnotify	Enable desktop notification support	41
libpfm	Activer le support de <pkg>dev-libs/libpfm</pkg>	2
libproxy	Support for automatic proxy configuration management through <pkg>net-libs/libproxy</pkg>.	11
libreoffice_extensions_nlpsolver	LIBREOFFICE_EXTENSIONS option to build non-linear solver for calc	0
libreoffice_extensions_scripting-beanshell	LIBREOFFICE_EXTENSIONS option to build beanshell scripts parser	0
libreoffice_extensions_scripting-javascript	LIBREOFFICE_EXTENSIONS option to build javascript scripts parser	0
libreoffice_extensions_wiki-publisher	LIBREOFFICE_EXTENSIONS option to build mediawiki integration	0
libretro	Build libretro port	3
libsamplerate	Build with support for converting sample rates using libsamplerate	24
libsoxr	Enable resampling with <pkg>media-libs/soxr</pkg>	3
libssh	Use <pkg>net-libs/libssh</pkg> to communicate with remote libvirtd hosts, for example: qemu+libssh://server/system	4
libssh2	Use <pkg>net-libs/libssh2</pkg> to communicate with remote libvirtd hosts, for example: qemu+libssh2://server/system	3
libtirpc	Build against <pkg>net-libs/libtirpc</pkg> for RPC support	4
libtomcrypt	Support crypto algorithms through <pkg>dev-libs/libtomcrypt</pkg> instead of <pkg>dev-libs/openssl</pkg>	2
libtracefs	Enable <pkg>dev-libs/libtracefs</pkg> support	2
libunibreak	Use <pkg>dev-libs/libunibreak</pkg> for hyphenation	4
libusb	Support libusb based capture sources such as mousejack, cc2540(ble), and nrf51822(ble)	4
libutf8proc	Use <pkg>dev-libs/libutf8proc</pkg> for manipulating unicode strings	4
libuv	Use <pkg>dev-libs/libuv</pkg> backend.	5
libvirt	Support managing virtual machines with <pkg>app-emulation/libvirt</pkg>.	7
libvisual	Enable visualization effects via <pkg>media-libs/libvisual</pkg>	2
libwww	Add libwww support (General purpose WEB API)	2
libxml2	Use <pkg>dev-libs/libxml2</pkg> to parse XML	8
libyuv	Enable fast YUV conversion via libyuv	2
lighttpd	install <pkg>www-servers/lighttpd</pkg> config	2
lilo	Enable support for directly booting kernels such as Linux	2
lirc	Add support for lirc (Linux's Infra-Red Remote Control)	15
livecd	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used during livecd building	9
lksh	variant that uses POSIX-compliant arithmetics with the host “long” data type and is automatically in POSIX mode when called as /bin/sh	2
llvm	Enables support for LLVM Address Sanitizer	13
llvm-libunwind	Use llvm-runtimes/libunwind instead of sys-libs/libunwind	20
llvm_slot_16	Use LLVM 16.	0
llvm_slot_17	Use LLVM 17.	0
llvm_slot_18	Use LLVM 18.	0
llvm_slot_19	Use LLVM 19.	0
llvm_slot_20	Use LLVM 20.	0
llvm_slot_22	Use LLVM 22.	0
llvm_slot_23	Use LLVM 23.	0
llvm_slot_24	Use LLVM 24.	0
llvm_targets_AArch64	AArch64 CPU target (arm64 in Gentoo)	0
llvm_targets_ARC	ARC (Argonaut RISC Core) embedded CPU target [EXPERIMENTAL]	0
llvm_targets_ARM	ARM CPU target	0
llvm_targets_AVR	8-bit Atmel AVR microcontroller target	0
llvm_targets_BPF	Berkeley Packet Filter target	0
llvm_targets_CSKY	C-SKY CPU target [EXPERIMENTAL]	0
llvm_targets_DirectX	DirectX target [EXPERIMENTAL]	0
llvm_targets_Hexagon	Qualcomm Hexagon DSP target	0
llvm_targets_Lanai	Lanai CPU target	0
llvm_targets_LoongArch	LoongArch CPU support [EXPERIMENTAL]	0
llvm_targets_M68k	Motorola 68000 target [EXPERIMENTAL]	0
llvm_targets_MSP430	MSP430 CPU target (experimental)	0
llvm_targets_Mips	MIPS CPU target (includes MIPS64)	0
llvm_targets_PowerPC	PowerPC CPU target (PPC32 and PPC64)	0
llvm_targets_RISCV	RISC-V CPU target	0
llvm_targets_Sparc	Sparc CPU target	0
llvm_targets_SystemZ	SystemZ (s390x) CPU target	0
llvm_targets_VE	NEC SX-Aurora TSUBASA vector engine target	0
llvm_targets_X86	X86 CPU target (includes amd64)	0
llvm_targets_XCore	XCore CPU target	0
llvm_targets_Xtensa	Tensilica Xtensa (ESP32) CPU target [EXPERIMENTAL]	0
lm-sensors	Add linux lm-sensors (hardware sensors) support	9
lmdb	Enable LMDB (Lightning Memory-Mapped Database) backend for header caching	15
local	Build "local" installation target	2
location	Install documentation for <pkg>dev-qt/qtlocation</pkg>	2
locking	Compile in support for locking the display	2
logger	build the logger program	5
logging	Enable logging	3
logrotate	Use <pkg>app-admin/logrotate</pkg> for rotating logs	2
loudness	Support loudness normalisation according to the EBU R128 standard using <pkg>media-libs/libebur128</pkg>	4
low-memory	Build using PyPy with the engine configured towards low memory footprint. This makes it possible to build PyPy using ~3.5G of RAM on amd64 and ~half of that on x86, at the cost of lengthened build time.	2
lowmem	Reduce runtime memory usage at the expense of performance (ecmult window size 4, gen precision 2)	2
lsp	Enable the Language Server Protocol plugin	2
lto	Enable Link-Time Optimization (LTO) to optimize the build	8
lua	Enable Lua scripting support	67
lua_single_target_lua5-1	Build for Lua 5.1 only	0
lua_single_target_lua5-3	Build for Lua 5.3 only	0
lua_single_target_lua5-4	Build for Lua 5.4 only	0
lua_single_target_luajit	Build for LuaJIT only	2
lua_targets_lua5-1	Build with Lua 5.1	0
lua_targets_lua5-3	Build with Lua 5.3	0
lua_targets_lua5-4	Build with Lua 5.4	0
lua_targets_luajit	Build with LuaJIT	0
luajittex	Add support for LuaJitTeX: LuaTeX based on LuaJIT which is usually faster.	2
lv2	Build lv2 plugins	16
lvm	Build VBoxVolInfo that needs devicemapper from <pkg>sys-fs/lvm2</pkg>.	8
lz4	Enable support for lz4 compression (as implemented in app-arch/lz4)	40
lzip	Enable support for lzip compression	6
lzma	Support for LZMA compression algorithm	60
lzo	Enable support for lzo compression	30
m17n-lib	Enable m17n-lib support	4
mad	Add support for mad (high-quality mp3 decoder library and cli frontend)	25
magic	Add support for file type detection via magic bytes (usually via libmagic from sys-apps/file)	12
mail	Add an extension to support e-mail functionality.	3
maildir	Add support for maildir (~/.maildir) style mail spools	4
man	Build and install man pages	52
map	Enable items GPS map display	4
mariadb	Prefer <pkg>dev-db/mariadb-connector-c</pkg> over <pkg>dev-db/mysql-connector-c</pkg>	12
markdown	Markdown support	8
mate	Install <pkg>x11-themes/mate-icon-theme</pkg> which is needed when this package is used in the MATE desktop environment.	4
math	Enable support for glibc's libm math library	4
mathml	Add support for mathml	2
matio	Enable support for matlab files using <pkg>sci-libs/matio</pkg>	3
matroska	Add support for the matroska container format (extensions .mkv, .mka and .mks)	2
maxminddb	Enable geolocation support via <pkg>dev-libs/libmaxminddb</pkg>	3
mbedtls	Use <pkg>net-libs/mbedtls</pkg> instead of <pkg>dev-libs/openssl</pkg>	15
mbim	Support QMI over Mobile Broadband Interface Model (MBIM)	2
mbox	Add support for mbox (/var/spool/mail) style mail spools	6
mdb	Enable support for Microsoft Access database using <pkg>app-office/mdbtools</pkg>	2
mecab	Use <pkg>app-text/mecab</pkg> for morphological analysis	3
media	Enable sound support for animations via <pkg>media-libs/mlt</pkg>	6
memcached	Add support for memcached	8
mercurial	Support mercurial sync-type.	3
mesh	Build the mesh module and workbench	3
metapost	Add support for metapost: A tool for creating graphics in scalable PostScript	2
metis	Enables metis support	8
metric	Use A4 instead of US Letter paper size by default for PostScript output. This option has effect only if libpaper USE flag is disabled	2
mhash	Add support for the mhash library	4
midi	Basic support for MIDI files	14
mikmod	Add libmikmod support to allow playing of SoundTracker-style music files	8
milter	Add sendmail mail filter (milter) support	2
mimalloc	Build using <pkg>dev-libs/mimalloc</pkg> as memory allocator	3
minimal	Install a very minimal build (disables, for example, plugins, fonts, most drivers, non-critical features)	168
minizip	Build with zip file compression support	3
mk		2
mkl	Enable support for Intel FFT <pkg>sci-libs/mkl</pkg>	8
mmap	Add mmap (memory map) support	5
mms	Support for Microsoft Media Server (MMS) streams	6
mng	Add support for libmng (MNG images)	8
mobi	Enable mobipocket support via <pkg>kde-apps/kdegraphics-mobipocket</pkg>	3
modemmanager	Enable support for mobile broadband devices using <pkg>net-misc/modemmanager</pkg>	7
modplug	Add libmodplug support for playing SoundTracker-style music files	17
module	Compile the actual WireGuard kernel module. Most certainly you want this enabled, unless you're doing something strange.	2
modules	Build the kernel modules	7
modules-compress	Install compressed kernel modules (if kernel config enables module compression)	0
modules-sign	Cryptographically sign installed kernel modules (requires CONFIG_MODULE_SIG=y in the kernel)	0
mongodb	Support returning data to a mongodb server.	10
monitor	Adds access to monitoring and operation related services.	5
mono	Build Mono bindings to support dotnet type stuff	8
motif	Add support for the Motif toolkit	11
mount	Use systemd mount/umount for operations.	3
mouse	Make elinks to grab all mouse events	2
mp3	Add support for reading mp3 files	41
mp4	Support for MP4 container format	8
mpc	Add support for multiprecision complex arithmetic (<pkg>dev-libs/mpc</pkg>)	2
mpd	Install the <pkg>media-sound/xfmpc</pkg> MPD client.	7
mpeg	Add libmpeg3 support to various packages	2
mpfr	Add support for multiprecision floating point rounding (<pkg>dev-libs/mpfr</pkg>)	5
mpg123	Enable mp3@64 cartridge support	7
mpi	Add MPI (Message Passing Interface) layer to the apps that support it	57
mplayer	Enable mplayer support for playback or encoding	3
mpris	Enable support for mpris	7
mpv	Support for video files using <pkg>media-video/mpv</pkg>	4
mqtt	Enable MQTT support	6
msgpack	Enable <pkg>dev-libs/msgpack</pkg> used for suggestion	2
mssql	Add support for Microsoft SQL Server database	5
mta	Enable this to install as system-wide MTA	4
mtp	Enable support for Media Transfer Protocol	8
multicall	Build all the programs as one little binary (to save space)	3
multilib	On 64bit systems, if you want to be able to compile 32bit and 64bit binaries	5
multimedia	Pull in <pkg>kde-apps/kdemultimedia-meta</pkg> packages	6
multitarget	Enable all possible targets in libbfd	4
multiuser	Enable multiuser support (by setting correct permissions)	2
mumps	Add support for mumps (<pkg>sci-libs/mumps</pkg>)	6
munin	Install a plugin for <pkg>net-analyzer/munin</pkg> to graph statistical data from ekeyd.	2
musepack	Enable support for the musepack audio codec	15
music	Install extra music	7
musicbrainz	Lookup audio metadata using MusicBrainz community service (musicbrainz.org)	3
mysql	Add mySQL Database support	120
mysqli	Add support for the improved mySQL libraries	3
nagios	Build against <pkg>net-analyzer/nagios-core</pkg> (the default)	2
nas	Add support for network audio sound	14
native-extensions	Build native (e.g. C, Rust) extensions in addition to pure (e.g. Python) code (usually speedups)	30
native-symlinks	Install generic symlinks like pkgconf and pkg-config. If this flag is disabled, only CHOST-prefixed pkg-config executables will be available to end users and ebuilds.	8
nautilus	Install the <pkg>gnome-base/nautilus</pkg> extension	8
nb		3
nbd	Allow using <pkg>sys-block/nbdkit</pkg> to access network disks	4
ncurses	Add ncurses support (console display library)	85
neXt	Enable neXt toolkit	2
net	Enable /dev/tcp/host/port redirection	4
netapi	build support for <pkg>net-fs/samba</pkg>s offline join feature	3
netcdf	Enable NetCDF data format support	10
netgen	Build support for the netgen mesher through <pkg>media-gfx/netgen</pkg>.	2
netlink	Use <pkg>dev-libs/libnl</pkg> to put wireless interfaces in monitor mode.	10
nettle	Use <pkg>dev-libs/nettle</pkg> for message digests, plus <pkg>dev-libs/gmp</pkg> for bittorrent (if enabled). If this flag is disabled, <pkg>dev-libs/libgcrypt</pkg> is used instead. This flag is ignored if <pkg>dev-libs/openssl</pkg> is used.	10
network	Build Qt6Network module	20
network-cron	Install a monthly cronjob to update the update-smartcard_list script	3
networking	Enable support for emulation of network cards.	3
networkmanager	Enable net-misc/networkmanager support	20
new-dynarec	Enable new dynamic recompiler from PCem 15, which should provide an even better emulation speed.	2
nfacct	Enable the nfacct plugin	2
nfc	Enable support for the Near Field Communication protocol	5
nflog	Build NFLOG input plugin to support stateless packet-based logging via nfnetlink_log	3
nfqueue	Enable NFQUEUE support for inline IDP	2
nfs	enable support for checking nfs mounts	12
nfsv4	Enable support for NFSv4 (includes NFSv4.1 and NFSv4.2)	2
nftables	Use <pkg>net-firewall/nftables</pkg> as firewall.	6
nginx	Enable mime-types support for <pkg>www-servers/nginx</pkg> package	4
nginx_modules_http_access	Add support for a simple host-based access control	0
nginx_modules_http_auth_basic	Add support for limiting access to a location by validating the username and password using the HTTP Basic Authentication	0
nginx_modules_http_auth_ldap	Add support for LDAP authentication module for NGINX	0
nginx_modules_http_auth_pam	Add support for authentication via PAM	0
nginx_modules_http_auth_request	Add support for client authorization based on the result of a subrequest	0
nginx_modules_http_autoindex	Add support for processing requests ending with the slash character ('/') and produciing a directory listing	0
nginx_modules_http_brotli	Add support for on-the-fly Brotli compression	0
nginx_modules_http_browser	Add support for creating variables whose values depend on the value of the "User-Agent" request header field	0
nginx_modules_http_cache_purge	Add support for purging content from NGINX's FastCGI and proxy caches	0
nginx_modules_http_charset	Add support for adding the specified charset to the "Content-Type" response header field and reencoding singe-byte charsets	0
nginx_modules_http_dav_ext	Add support for the additional WebDAV methods into the existing WebDAV module: PROPFIND & OPTIONS	0
nginx_modules_http_degradation	Add support for returning 204 or 444 code for some locations on low memory condition (reliable on FreeBSD only)	0
nginx_modules_http_echo	Add support for shell-style goodies in the NGINX configuration file	0
nginx_modules_http_empty_gif	Add support for emiting a single-pixel transparent GIF	0
nginx_modules_http_fancyindex	Add support for the fancy generation of file listings	0
nginx_modules_http_fastcgi	Add support for passing requests to a FastCGI server	0
nginx_modules_http_flv	Add support for the server-side pseudo-streaming of Flash Video (FLV) files	0
nginx_modules_http_geo	Add support for creating variables whose values depend on the client IP-address	0
nginx_modules_http_geoip	Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind databases	0
nginx_modules_http_geoip2	Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind GeoIP2 databases	0
nginx_modules_http_grpc	Add support for passing requests to a gRPC server	0
nginx_modules_http_gunzip	Add support for decompressing responses with "Content-Encoding: gzip" for clients that do not support "gzip" encoding method	0
nginx_modules_http_gzip	Add support for compressing responses using the "gzip" method	0
nginx_modules_http_gzip_static	Add support for sending precompressed files with the ".gz" filename extension instead of regular files	0
nginx_modules_http_headers_more	Add support for setting arbitrary input and output headers	0
nginx_modules_http_image_filter	Add support for transforming images in JPEG, GIF, PNG, and WebP formats	0
nginx_modules_http_javascript	Add support for implementing location and variable handlers in njs - a subset of the JavaScript language	0
nginx_modules_http_limit_conn	Add support for limiting the number of connections per a defined key, e.g. the number of connections from a single IP address	0
nginx_modules_http_limit_req	Add support for limiting the request processing rate per a defined key, e.g. the processing rate of requests coming from a single IP address	0
nginx_modules_http_lua	Add support for Lua scripting in NGINX	0
nginx_modules_http_map	Add support for creating variables whose values depend on values of other variables	0
nginx_modules_http_memc	Add support for an extended version of the standard memcached module that supports set, add, delete, and many more memcached commands	0
nginx_modules_http_memcached	Add support for obtaining responses from a memcached server	0
nginx_modules_http_metrics	Add support for exporting various metrics in an easy-parseable JSON format	0
nginx_modules_http_mirror	Add support for mirroring of the original request by creating background mirror subrequests	0
nginx_modules_http_mogilefs	Add support for MogileFS	0
nginx_modules_http_mp4	Add support for server-side pseudo-streaming for MP4 files	0
nginx_modules_http_naxsi	Add support for NAXSI WAF (Web Application Firewall)	0
nginx_modules_http_perl	Add support for implementing location and variable handlers in Perl and inserting Perl calls into SSI	0
nginx_modules_http_proxy	Add support for passing subrequests to another server	0
nginx_modules_http_push_stream	Add support for the stream HTTP push module, which supports EventSource, WebSocket, Long Polling, and Forever Iframe	0
nginx_modules_http_random_index	Add support for processing requests ending with the slash character ('/') by picking a random file in a directory to serve as an index file	0
nginx_modules_http_realip	Add support for setting the client address and optional port to those sent in the specified header field (e.g. "X-Real-IP" or "X-Forwarded-For")	0
nginx_modules_http_referer	Add support for blocking access to a site for requests with invalid values in the "Referer" header field	0
nginx_modules_http_scgi	Add support for passing requests to an SCGI server	0
nginx_modules_http_secure_link	Add support for checking authenticity of requested links, protecting resources from unauthorized access, and limiting link lifetime	0
nginx_modules_http_security	Add support for modsecurity: web application firewall and intrusion detection system	0
nginx_modules_http_slice	Add support for spliting a request into subrequests, each returning a certain range of response	0
nginx_modules_http_slowfs_cache	Add support for caching static files	0
nginx_modules_http_split_clients	Add support for creating variables suitable for A/B testing, also known as split testing	0
nginx_modules_http_ssi	Add support for processing SSI (Server Side Includes) commands in responses passing through NGINX	0
nginx_modules_http_ssl	Add support for HTTPS - SSL/TLS-encrypted HTTP	0
nginx_modules_http_sticky	Add support for sending a sticky cookie in order to always forward client to the same upstream server	0
nginx_modules_http_sub	Add support for modifying a response by replacing one specified string by another	0
nginx_modules_http_upload_progress	Add support for an upload progress system, that monitors RFC1867 POST uploads as they are transmitted to upstream servers	0
nginx_modules_http_upstream_check	Add support for performing health check of upstream servers	0
nginx_modules_http_upstream_hash	Add support for distributing upstream requests based on hashed key value	0
nginx_modules_http_upstream_ip_hash	Add support for distributing upstream requests based on the IP-address of the client	0
nginx_modules_http_upstream_keepalive	Add support for caching connections to upstream servers	0
nginx_modules_http_upstream_least_conn	Add support for passing upstream requests to the server with the least number of active connections	0
nginx_modules_http_upstream_random	Add support for passing upstream requests to a randomly selected server	0
nginx_modules_http_upstream_sticky	Add support for session affinity, i.e. passing requests from the same client to the same same server in a group of servers	0
nginx_modules_http_upstream_zone	Add support for defining a shared memory zone that keeps the group's configuration and run-time state that are shared between worker processes	0
nginx_modules_http_userid	Add support for setting cookies suitable for client identification	0
nginx_modules_http_uwsgi	Add support for passing requests to a uwsgi server	0
nginx_modules_http_v2	Add support for HTTP/2	0
nginx_modules_http_v3	Add experimental support for HTTP/3	0
nginx_modules_http_vhost_traffic_status	Add support for providing access to virtual host status information	0
nginx_modules_http_vod	Add support for streaming video using DASH, HDS, HLS, MSS	0
nginx_modules_mail_imap	Add support for proxying IMAP messages	0
nginx_modules_mail_pop3	Add support for proxying POP3 messages	0
nginx_modules_mail_smtp	Add support for proxying SMTP messages	0
nginx_modules_mail_ssl	Add SSL/TLS protocol support to a mail proxy server (implicit TLS, STARTTLS, etc.)	0
nginx_modules_stream_access	Add support for a simple host-based access control	0
nginx_modules_stream_geo	Add support for creating variables whose values depend on the client IP-address	0
nginx_modules_stream_geoip	Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind databases	0
nginx_modules_stream_geoip2	Add support for creating variables whose values depend on the client IP-address, using the precompiled MaxMind GeoIP2 databases	0
nginx_modules_stream_javascript	Add support for implementing location and variable handlers in njs - a subset of the JavaScript language	0
nginx_modules_stream_limit_conn	Add support for limiting the number of connections per a defined key, e.g. the number of connections from a single IP address	0
nginx_modules_stream_map	Add support for creating variables whose values depend on the values of other variables	0
nginx_modules_stream_pass	Add support for passing the accepted connection directly to any configured listening socket in "http", "stream", "mail", and other similar modules	0
nginx_modules_stream_realip	Add support for setting the client address and optional port to those sent in the specified header field (e.g. "X-Real-IP" or "X-Forwarded-For")	0
nginx_modules_stream_return	Add support for sending a specified value to the client and then closing the connection	0
nginx_modules_stream_set	Add support for setting a value for a variable	0
nginx_modules_stream_split_clients	Add support for creating variables suitable for A/B testing, also known as split testing	0
nginx_modules_stream_ssl	Add SSL/TLS protocol support to a stream proxy server	0
nginx_modules_stream_ssl_preread	Add support for extracting information from the ClientHello message without terminating SSL/TLS connection	0
nginx_modules_stream_upstream_hash	Add support for distributing upstream requests based on hashed key value	0
nginx_modules_stream_upstream_least_conn	Add support for passing upstream requests to the server with the least number of active connections	0
nginx_modules_stream_upstream_random	Add support for passing upstream requests to a randomly selected server	0
nginx_modules_stream_upstream_zone	Add support for defining a shared memory zone that keeps the group's configuration and run-time state that are shared between worker processes	0
nightly	Add &#39;-nightly-COMPILEDATE&#39; to the output of &#39;--version&#39;.	2
nis	Support for NIS/YP services	6
nl		3
nls	Add Native Language Support (using gettext - GNU locale utilities)	462
nmea	NMEA GPS driver	2
nntp	Add support for newsgroups (Network News Transfer Protocol)	4
non-free	Install non-free ponies (i.e. from the MLP franchise)	5
non-root	Force IKEv1/IKEv2 daemons to normal user privileges. This might impose some restrictions mainly to the IKEv1 daemon. Disable only if you really require superuser privileges.	2
normalize	Build the normalize modify module (requires <pkg>dev-libs/libee</pkg> and <pkg>dev-libs/liblognorm</pkg>)	2
notification	Notification for new mail in different ways	5
notify	Show what's playing via a notification	3
nova	Enable support for the OpenStack Nova API	2
nss	Enable NSS crypto engine	14
ntfs	Include the ability to read NTFS filesystems	3
ntlm	Add support for Microsoft's NTLM mechanism using <pkg>net-libs/libntlm</pkg>	5
ntp	Enable NTPD cooperation	2
numa	Build with support for NUMA nodes.	20
numpy	Build with support for <pkg>dev-python/numpy</pkg>	6
nvcontrol	Add NVCONTROL support for OpenGL options	2
nvdec	Support for NVDEC (NVCUVID) hardware accelerated video decoding	2
nvenc	Add support for NVIDIA Encoder/Decoder (NVENC/NVDEC) API for hardware accelerated encoding and decoding on NVIDIA cards (requires x11-drivers/nvidia-drivers)	7
nvidia	Enable reading of nvidia card temperature sensors via <pkg>x11-drivers/nvidia-drivers</pkg>	4
nvme	Build and install NVMe plugin	3
nvml	Enable the NVML device discovery	2
oauth	Enable OAuth2 authentication support	5
ocaml	Add support/bindings for the Ocaml language	7
ocamlopt	Enable ocamlopt support (ocaml native code compiler) -- Produces faster programs (Warning: you have to disable/enable it at a global scale)	248
oci8	Add Oracle 8 Database Support	2
ocr	Enable Optical Character Recognition support via <pkg>app-text/tesseract</pkg>	3
octave	Add bindings for <pkg>sci-mathematics/octave</pkg>	5
odbc	Add ODBC Support (Open DataBase Connectivity)	30
ods	Add ods import support	2
offensive	Enable potentially offensive items in packages	11
office_implementation_libreoffice	use the app-office/libreoffice{,-bin} implementation for extensions	0
ofono	Enable oFono telephony support	4
ofx	Enable support for importing (and exporting) OFX (Open Financial eXchange) data files	5
ogg	Add support for the Ogg container format (commonly used by Vorbis, Theora and flac)	19
old-kernel	Enable compatibility with older kernels	3
omemo	Enable OMEMO encryption	3
oniguruma	use <pkg>dev-libs/oniguruma</pkg> as regex implementation	3
openal	Add support for the Open Audio Library	21
openblas	Support <pkg>sci-libs/openblas</pkg> provider	2
opencascade	Enable OpenCASCADE support	5
opencl	Enable OpenCL support (computation on GPU)	27
openconnect	Build support for the OpenConnect VPN client	3
opencv	Use <pkg>media-libs/opencv</pkg> for additional image formats and OpenCL accelerated scaling	9
openexr	Support for the OpenEXR graphics file format	21
opengl	Add support for OpenGL (3D graphics)	129
openh264	Enable H.264 support using <pkg>media-libs/openh264</pkg>	8
openipmi	Enable openipmi things	2
openldap	Enable support for ldap as a database backend	2
openmp	Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"	116
openmpt	Enable mod/tracker music file support via <pkg>media-libs/libopenmpt</pkg>	6
openni	Adds support for Kinect-like 3D sensors devices with <pkg>dev-libs/OpenNI</pkg>	2
openni2	Adds support for Kinect-like 3D sensors devices with <pkg>dev-libs/OpenNI2</pkg>.	3
openssl	Install apr_crypto_openssl module	42
opentype-compat	Convert BDF and PCF bitmap fonts to OTB wrapper format	0
openvdb	Enable openvdb for volumetric processing, like the voxel remesher. Also enables volumetric GPU preview rendering for Nvidia cards.	3
openvpn	enable support for OpenVPN	2
optimisememory	To build libtcmalloc with smaller internal caches.	2
optimize	Enable optimization via CFLAGS	4
optix	Add support for NVIDIA's OptiX Raytracing Engine.	2
opus	Enable Opus audio codec support	35
oracle	Enable Oracle Database support	9
orc	Use dev-lang/orc for just-in-time optimization of array operations	9
osc	Enable support for Open Sound Control	9
osd	Overlay emulator messages using on-screen-display	4
oss	Add support for OSS (Open Sound System)	64
otp	Adds support for one-time passwords	2
otr	Enable support for encrypted conversations	3
pam	Add support for PAM (Pluggable Authentication Modules) - DANGEROUS to arbitrarily flip	107
pango	Enable Pango support using <pkg>x11-libs/pango</pkg>	10
parport	Enable parallel port SID support	5
parquet	Enables read/write parquet data format	4
passwd	Enable /etc/passwd authentication	2
passwdqc	Enable pam_passwdqc module on system auth stack for password quality validation. This module produces warnings, rejecting or providing example passwords when changing your system password. It is used by default by OpenWall GNU/*/Linux and by FreeBSD.	3
password	Enable save passwords to connect mail servers in user space	2
pax-kernel	Triggers a paxmarking of the main Spotify binary	7
pcap	Add support for network packet capture via <pkg>net-libs/libpcap</pkg>	22
pch	Enable precompiled header support for faster compilation at the expense of disk space and memory	10
pci	Enable PCI device discovery using <pkg>sys-apps/pciutils</pkg>	5
pcmcia	Add support for PCMCIA slots/devices found on laptop computers	2
pcre	Add support for Perl Compatible Regular Expressions	57
pcre-jit	Enable JIT for pcre	2
pcre2	Add support for Perl Compatible Regular Expressions 2	3
pcsc-lite	Enable smartcard support with <pkg>sys-apps/pcsc-lite</pkg>	5
pdal	Enable support for PDAL for point clouds via <pkg>sci-libs/pdal</pkg>	4
pdf	Add general support for PDF (Portable Document Format), this replaces the pdflib and cpdflib flags	51
pdfium	Build the QtPdf module based on chromium's PDFium library	4
performance	Enable CUTLASS Performance	2
perl	Add optional support/bindings for the Perl language	84
perl_features_ithreads	PERL_FEATURES setting enabling interpreter level threads, has some compatibility problems	2
pgo	Add support for profile-guided optimization for faster binaries - this option will double the compile time	11
pgp	Enable PGP support	2
pgplot	Enable PGPLOT plotting capabilities	2
php	Include support for the PHP language	7
pic	disable optimized assembly code that is not PIC friendly	3
pidgin	Add an extension to support <pkg>net-im/pidgin</pkg>	2
pie	Build programs as Position Independent Executables (a security hardening technique)	7
pim	Enable support for KDE PIM resources integration	4
pinentry	Support <pkg>app-crypt/pinentry</pkg> password input backend.	2
ping	Enable ping	2
pipewire	Enable support for the <pkg>media-video/pipewire</pkg> audio backend	30
pkcs11	Enable PKCS#11 support in certificate chooser via <pkg>app-crypt/gcr</pkg>	14
pkcs7	Enable PKCS7 verification support via <pkg>net-libs/gnutls</pkg>	2
pl		4
plasma	Build optional KDE plasma addons	7
player	Enable audio using aplay from <pkg>media-sound/alsa-utils</pkg>	2
playlist	Enable support for playlists through <pkg>dev-libs/totem-pl-parser</pkg>	3
plotutils	Add support for plotutils (library for 2-D vector graphics)	3
plugins	Build official plugins	23
plymouth	Add <pkg>sys-boot/plymouth</pkg> support	3
png	Add support for libpng (PNG images)	125
policykit	Enable PolicyKit (polkit) authentication support	31
poll	Use experimental patch to use poll rather than select (scalability patch)	4
pop	Enable support for POP3 mailboxes	2
pop3	Enable the pop3 plugin, to get notified about new mails.	4
poppler	Use <pkg>app-text/poppler</pkg> instead of <pkg>app-text/mupdf</pkg> for rendering PDF files	4
portaudio	Add support for the crossplatform portaudio audio API	32
portmidi	Add portmidi support	8
positioning	Build bindings for the QtPositioning module	4
posix	Add support for POSIX-compatible functions	2
postfix	Set <pkg>mail-mta/postfix</pkg> to used MTA	2
postgres	Add support for the postgresql database	109
postgres_targets_postgres14	Build against PostgreSQL 14	0
postgres_targets_postgres15	Build against PostgreSQL 15	0
postgres_targets_postgres16	Build against PostgreSQL 16	0
postgres_targets_postgres17	Build against PostgreSQL 17	0
postgres_targets_postgres18	Build against PostgreSQL 18	0
postproc	Enable additional post processing filters	4
postscript	Enable support for the PostScript language (often with ghostscript-gpl or libspectre)	25
ppd	Install tuned-ppd, a drop-in replacement for <pkg>sys-power/power-profiles-daemon</pkg>	2
prefix	Defines if a Gentoo Prefix offset installation is used	5
primesieve	Add support for <pkg>sci-mathematics/primesieve</pkg>	2
privsep	Enable support for privilege separation	2
profile	Add support for software performance analysis (will likely vary from ebuild to ebuild)	16
profiler	Enable CUTLASS Profiler	3
profiling	Enable rules profiling	3
programs	Builds also executable applications	2
proj	Add the <pkg>sci-libs/proj</pkg> library for reprojection features	2
projectm	Enable projectm music visualization plugin	2
projects	Build gnatcoll_projects	2
prometheus	Enable support for the Prometheus remote write backend	5
proprietary-codecs	Enable codecs for patent-encumbered audio and video formats.	8
protobuf	Build protobuf libraries and protoc compiler	3
proxy	Add support for being behind a proxy, such as HAProxy	5
psd	Enable PSD image loader	2
psl	Enable Public Suffix List (PSL) support. See https://daniel.haxx.se/blog/2024/01/10/psl-in-curl/.	4
pt		3
pt-BR		3
ptp	Controls Precision Time Protocol (PTP) helper. Written in Rust.	2
ptpax	Enable PT_PAX_FLAGS support.	2
pulseaudio	Add sound server support via media-libs/libpulse (may be PulseAudio or PipeWire)	123
purple	Enables the libpurple backend, based on <pkg>net-im/pidgin</pkg>.	3
pwquality	Use <pkg>dev-libs/libpwquality</pkg> for password quality checking in vncpasswd	4
python	Add optional support/bindings for the Python language	215
python_single_target_python3_12	Build for Python 3.12 only	0
python_single_target_python3_13	Build for Python 3.13 only	0
python_single_target_python3_14	Build for Python 3.14 only	0
python_single_target_python3_14t	Build for Python 3.14 freethreading only	0
python_single_target_python3_15	Build for Python 3.15 only	0
python_single_target_python3_15t	Build for Python 3.15 freethreading only	0
python_targets_python3_12	Build with Python 3.12	0
python_targets_python3_13	Build with Python 3.13	0
python_targets_python3_14	Build with Python 3.14	0
python_targets_python3_14t	Build with Python 3.14 freethreading	0
python_targets_python3_15	Build with Python 3.15	0
python_targets_python3_15t	Build with Python 3.15 freethreading	0
qch	Install API documentation in QCH format	3
qdbm	Add support for the qdbm (Quick Database Manager) library	3
qemu	Pull dependencies needed to manage QEMU-based virtual machines with Incus	6
qemu_softmmu_targets_aarch64	ARM64 system emulation target	0
qemu_softmmu_targets_alpha	system emulation target	0
qemu_softmmu_targets_arm	system emulation target	0
qemu_softmmu_targets_avr	system emulation target	0
qemu_softmmu_targets_cris	system emulation target	0
qemu_softmmu_targets_hppa	system emulation target	0
qemu_softmmu_targets_i386	system emulation target	0
qemu_softmmu_targets_loongarch64	system emulation target	0
qemu_softmmu_targets_m68k	system emulation target	0
qemu_softmmu_targets_microblaze	system emulation target	0
qemu_softmmu_targets_microblazeel	system emulation target	0
qemu_softmmu_targets_mips	system emulation target	0
qemu_softmmu_targets_mips64	system emulation target	0
qemu_softmmu_targets_mips64el	system emulation target	0
qemu_softmmu_targets_mipsel	system emulation target	0
qemu_softmmu_targets_nios2	system emulation target	0
qemu_softmmu_targets_or1k	OpenRISC system emulation target	0
qemu_softmmu_targets_ppc	system emulation target	0
qemu_softmmu_targets_ppc64	system emulation target	0
qemu_softmmu_targets_riscv32	system emulation target	0
qemu_softmmu_targets_riscv64	system emulation target	0
qemu_softmmu_targets_rx	Renesas RX system emulation target	0
qemu_softmmu_targets_s390x	system emulation target	0
qemu_softmmu_targets_sh4	system emulation target	0
qemu_softmmu_targets_sh4eb	system emulation target	0
qemu_softmmu_targets_sparc	system emulation target	0
qemu_softmmu_targets_sparc64	system emulation target	0
qemu_softmmu_targets_tricore	system emulation target	0
qemu_softmmu_targets_x86_64	system emulation target	0
qemu_softmmu_targets_xtensa	system emulation target	0
qemu_softmmu_targets_xtensaeb	system emulation target	0
qemu_user_targets_aarch64	ARM64 userspace emulation target	0
qemu_user_targets_aarch64_be	ARM64 big endian userspace emulation target	0
qemu_user_targets_alpha	userspace emulation target	0
qemu_user_targets_arm	ARM (little endian) userspace emulation target	0
qemu_user_targets_armeb	ARM (big endian) userspace emulation target	0
qemu_user_targets_cris	userspace emulation target	0
qemu_user_targets_hexagon	Qualcomm hexagon userspace emulation target	0
qemu_user_targets_hppa	userspace emulation target	0
qemu_user_targets_i386	userspace emulation target	0
qemu_user_targets_loongarch64	userspace emulation target	0
qemu_user_targets_m68k	userspace emulation target	0
qemu_user_targets_microblaze	userspace emulation target	0
qemu_user_targets_microblazeel	userspace emulation target	0
qemu_user_targets_mips	userspace emulation target	0
qemu_user_targets_mips64	userspace emulation target	0
qemu_user_targets_mips64el	userspace emulation target	0
qemu_user_targets_mipsel	userspace emulation target	0
qemu_user_targets_mipsn32	MIPS N32 ABI userspace emulation target	0
qemu_user_targets_mipsn32el	MIPS N32 ABI LE userspace emulation target	0
qemu_user_targets_nios2	userspace emulation target	0
qemu_user_targets_or1k	OpenRISC system emulation target	0
qemu_user_targets_ppc	PowerPC 32-bit big endian userspace emulation target	0
qemu_user_targets_ppc64	PowerPC 64-bit big endian userspace emulation target	0
qemu_user_targets_ppc64le	PowerPC 64-bit little endian userspace emulation target	0
qemu_user_targets_riscv32	userspace emulation target	0
qemu_user_targets_riscv64	userspace emulation target	0
qemu_user_targets_s390x	userspace emulation target	0
qemu_user_targets_sh4	userspace emulation target	0
qemu_user_targets_sh4eb	userspace emulation target	0
qemu_user_targets_sparc	userspace emulation target	0
qemu_user_targets_sparc32plus	userspace emulation target	0
qemu_user_targets_sparc64	userspace emulation target	0
qemu_user_targets_x86_64	userspace emulation target	0
qemu_user_targets_xtensa	userspace emulation target	0
qemu_user_targets_xtensaeb	userspace emulation target	0
qhull	Enable support for linear interpolation of gdal_grid with <pkg>media-libs/qhull</pkg>	4
qmail-spp	Add support for qmail SMTP plugins	3
qml	Enable QML/QtQuick support via <pkg>dev-qt/qtdeclarative</pkg>	26
qos	Enable support for the mod_qos module	2
qrcode	Install dependencies needed to generate QR Codes for WiFi login.	11
qrtr	Support QMI over IPC Router bus (QRTR)	2
qt5	Add support for the Qt 5 application and UI framework	6
qt6	Add support for the Qt 6 application and UI framework	70
qtmedia	Enable playback via <pkg>dev-qt/qtmultimedia</pkg>	5
quic	DNS-over-QUIC support	8
quick3d	Enable support for 3D graphs using <pkg>dev-qt/qtquick3d</pkg>	5
quirc	Enable QR decoding support via <pkg>media-libs/quirc</pkg>	3
quota	Enables quota compatibility	3
rabbitmq	Build the RabbitMQ output module (requires <pkg>net-libs/rabbitmq-c</pkg>)	5
racket	build using <pkg>dev-scheme/racket</pkg>	3
radius	Add support for RADIUS authentication	8
rar	RAR support	9
rav1e	Enable support for the rav1e codec encoding	5
raw	Add support for raw image formats	22
rbd	Enable rados block device backend support, see https://docs.ceph.com/en/mimic/rbd/qemu-rbd/	4
rcs	Adds support for family tree archives via <pkg>dev-vcs/rcs</pkg>	3
rdma	Enable RDMA capture support using <pkg>sys-cluster/rdma-core</pkg>	7
rdp	Enables RDP/Remote Desktop support	6
re2	Build with support for regular expressions using the re2 library	2
readline	Enable support for libreadline, a GNU line-editing library that almost everyone wants	123
recorder	Enable recording with <pkg>media-libs/libopenglrecorder</pkg>	2
redis	Add support for the Redis database via <pkg>dev-libs/hiredis</pkg>	19
redistributable	Install redistributable media kernel binaries (no source code) files (primarily needed for video encoding support)	2
reference	Use the reference implementation instead of the optimized one.	7
regex	String regular expression matching.	6
regis	Include support for ReGIS terminal	2
reiserfs	Include reiserfs reading ability	3
remote	Prepare group membership for <pkg>media-plugins/vdr-remote</pkg>.	5
remoteobjects	Build bindings for the QtRemoteObjects module	4
renderdoc	Enable support for capturing graphic's API calls using <pkg>media-gfx/renderdoc</pkg>	2
repl	Include support for running a pandoc Lua repl.	2
reports	All external software that is needed for graphical reports will be installed	2
resolvconf	Use resolvconf to handle /etc/resolv.conf updates	5
rfc3195	Build the rfc3195 input module (requires <pkg>dev-libs/liblogging</pkg>)	2
rnnoise	Enable use of <pkg>media-libs/rnnoise</pkg> for the neural network-based noise-reduction FX	3
ro		4
rocm	Enable Radeon Open Compute provider	8
roctracer	Enable roctracer (roctx) marker	5
romio	Build the ROMIO MPI-IO component	3
root	Build with ROOTIO enabled	6
rpc	support looking up RPC service info	7
rpm	Use <pkg>app-arch/rpm</pkg>	2
rrdtool	Enable rrdtool support	2
rsh	This allows the use of rsh (remote shell) and rcp (remote copy) for authoring websites. sftp is a much more secure protocol and is preferred.	3
rss	Enable support for RSS feeds	9
rsync	Enables linking with <pkg>net-libs/librsync</pkg> for delta compression support	3
rsyslog	Install configuration snippet for <pkg>app-admin/rsyslog</pkg>	2
rtc	Enables usage of the linux real time clock. The alternative is software emulation of rtc	2
rtlsdr	Add support for rtlsdr hardware	10
rtmp	Enables RTMPDump Streaming Media support	4
ru		4
rubberband	Enable audio pitch-shifting using <pkg>media-libs/rubberband</pkg>	10
ruby	Add support/bindings for the Ruby language	27
ruby_targets_ruby31	Build with MRI Ruby 3.1.x	2
ruby_targets_ruby32	Build with MRI Ruby 3.2.x	4
ruby_targets_ruby33	Build with MRI Ruby 3.3.x	4
ruby_targets_ruby40	Build with MRI Ruby 4.0.x	0
rust	Build the Rust implementation (if disabled, the "experimental" C implementation is used instead).	4
rust_sysroots_bpf	Berkeley Packet Filter target	0
rust_sysroots_wasm	WebAssembly target	0
rustls	Use Rustls instead of OpenSSL.	2
s3	Enable full Amazon S3 support	8
samba	Add support for SAMBA (Windows File and Printer sharing)	30
sample	Enable the sample plugin.	2
samples	Build viewer library	8
sane_backends_abaton	SANE_BACKENDS setting for building the abaton backend	0
sane_backends_agfafocus	SANE_BACKENDS setting for building the agfafocus backend	0
sane_backends_apple	SANE_BACKENDS setting for building the apple backend	0
sane_backends_artec	SANE_BACKENDS setting for building the artec backend	0
sane_backends_artec_eplus48u	SANE_BACKENDS setting for building the artec_eplus48u backend	0
sane_backends_as6e	SANE_BACKENDS setting for building the as6e backend	0
sane_backends_avision	SANE_BACKENDS setting for building the avision backend	0
sane_backends_bh	SANE_BACKENDS setting for building the bh backend	0
sane_backends_canon	SANE_BACKENDS setting for building the canon backend	0
sane_backends_canon630u	SANE_BACKENDS setting for building the canon630u backend	0
sane_backends_canon_dr	SANE_BACKENDS setting for building the canon_dr backend	0
sane_backends_canon_lide70	SANE_BACKENDS setting for building the canon_lide70 backend	0
sane_backends_canon_pp	SANE_BACKENDS setting for building the canon_pp backend	0
sane_backends_cardscan	SANE_BACKENDS setting for building the cardscan backend	0
sane_backends_coolscan	SANE_BACKENDS setting for building the coolscan backend	0
sane_backends_coolscan2	SANE_BACKENDS setting for building the coolscan2 backend	0
sane_backends_coolscan3	SANE_BACKENDS setting for building the coolscan3 backend	0
sane_backends_dc210	SANE_BACKENDS setting for building the dc210 backend	0
sane_backends_dc240	SANE_BACKENDS setting for building the dc240 backend	0
sane_backends_dc25	SANE_BACKENDS setting for building the dc25 backend	0
sane_backends_dell1600n_net	SANE_BACKENDS setting for building the dell1600n_net backend	0
sane_backends_dmc	SANE_BACKENDS setting for building the dmc backend	0
sane_backends_epjitsu	SANE_BACKENDS setting for building the epjitsu backend	0
sane_backends_epson	SANE_BACKENDS setting for building the epson backend	0
sane_backends_epson2	SANE_BACKENDS setting for building the epson2 backend	0
sane_backends_epsonds	SANE_BACKENDS setting for building the epsonds backend	0
sane_backends_escl	SANE_BACKENDS setting for building the escl backend	0
sane_backends_fujitsu	SANE_BACKENDS setting for building the fujitsu backend	0
sane_backends_genesys	SANE_BACKENDS setting for building the genesys backend	0
sane_backends_gt68xx	SANE_BACKENDS setting for building the gt68xx backend	0
sane_backends_hp	SANE_BACKENDS setting for building the hp backend	0
sane_backends_hp3500	SANE_BACKENDS setting for building the hp3500 backend	0
sane_backends_hp3900	SANE_BACKENDS setting for building the hp3900 backend	0
sane_backends_hp4200	SANE_BACKENDS setting for building the hp4200 backend	0
sane_backends_hp5400	SANE_BACKENDS setting for building the hp5400 backend	0
sane_backends_hp5590	SANE_BACKENDS setting for building the hp5590 backend	0
sane_backends_hpljm1005	SANE_BACKENDS setting for building the hpljm1005 backend	0
sane_backends_hpsj5s	SANE_BACKENDS setting for building the hpsj5s backend	0
sane_backends_hs2p	SANE_BACKENDS setting for building the hs2p backend	0
sane_backends_ibm	SANE_BACKENDS setting for building the ibm backend	0
sane_backends_kodak	SANE_BACKENDS setting for building the kodak backend	0
sane_backends_kodakaio	SANE_BACKENDS setting for building the kodak backend	0
sane_backends_kvs1025	SANE_BACKENDS setting for building the kvs1025 backend	0
sane_backends_kvs20xx	SANE_BACKENDS setting for building the kvs20xx backend	0
sane_backends_kvs40xx	SANE_BACKENDS setting for building the kvs20xx backend	0
sane_backends_leo	SANE_BACKENDS setting for building the leo backend	0
sane_backends_lexmark	SANE_BACKENDS setting for building the lexmark backend	0
sane_backends_ma1509	SANE_BACKENDS setting for building the ma1509 backend	0
sane_backends_magicolor	SANE_BACKENDS setting for building the magicolor backend	0
sane_backends_matsushita	SANE_BACKENDS setting for building the matsushita backend	0
sane_backends_microtek	SANE_BACKENDS setting for building the microtek backend	0
sane_backends_microtek2	SANE_BACKENDS setting for building the microtek2 backend	0
sane_backends_mustek	SANE_BACKENDS setting for building the mustek backend	0
sane_backends_mustek_pp	SANE_BACKENDS setting for building the mustek_pp backend	0
sane_backends_mustek_usb	SANE_BACKENDS setting for building the mustek_usb backend	0
sane_backends_mustek_usb2	SANE_BACKENDS setting for building the mustek_usb2 backend	0
sane_backends_nec	SANE_BACKENDS setting for building the nec backend	0
sane_backends_net	SANE_BACKENDS setting for building the net backend	0
sane_backends_niash	SANE_BACKENDS setting for building the niash backend	0
sane_backends_p5	SANE_BACKENDS setting for building the p5 backend	0
sane_backends_pie	SANE_BACKENDS setting for building the pie backend	0
sane_backends_pieusb	SANE_BACKENDS setting for building the pieusb backend	0
sane_backends_pixma	SANE_BACKENDS setting for building the pixma backend	0
sane_backends_plustek	SANE_BACKENDS setting for building the plustek backend	0
sane_backends_plustek_pp	SANE_BACKENDS setting for building the plustek_pp backend	0
sane_backends_pnm	SANE_BACKENDS settings for building the pnm test backend, considered a possible security risk	0
sane_backends_qcam	SANE_BACKENDS setting for building the qcam backend	0
sane_backends_ricoh	SANE_BACKENDS setting for building the ricoh backend	0
sane_backends_ricoh2	SANE_BACKENDS setting for building the ricoh2 backend	0
sane_backends_rts8891	SANE_BACKENDS setting for building the rts8891 backend	0
sane_backends_s9036	SANE_BACKENDS setting for building the s9036 backend	0
sane_backends_sceptre	SANE_BACKENDS setting for building the sceptre backend	0
sane_backends_sharp	SANE_BACKENDS setting for building the sharp backend	0
sane_backends_sm3600	SANE_BACKENDS setting for building the sm3600 backend	0
sane_backends_sm3840	SANE_BACKENDS setting for building the sm3840 backend	0
sane_backends_snapscan	SANE_BACKENDS setting for building the snapscan backend	0
sane_backends_sp15c	SANE_BACKENDS setting for building the sp15c backend	0
sane_backends_st400	SANE_BACKENDS setting for building the st400 backend	0
sane_backends_stv680	SANE_BACKENDS setting for building the stv680 backend	0
sane_backends_tamarack	SANE_BACKENDS setting for building the tamarack backend	0
sane_backends_teco1	SANE_BACKENDS setting for building the teco1 backend	0
sane_backends_teco2	SANE_BACKENDS setting for building the teco2 backend	0
sane_backends_teco3	SANE_BACKENDS setting for building the teco3 backend	0
sane_backends_test	SANE_BACKENDS setting for building the test backend	0
sane_backends_u12	SANE_BACKENDS setting for building the u12 backend	0
sane_backends_umax	SANE_BACKENDS setting for building the umax backend	0
sane_backends_umax1220u	SANE_BACKENDS setting for building the umax1220u backend	0
sane_backends_umax_pp	SANE_BACKENDS setting for building the umax_pp backend	0
sane_backends_xerox_mfp	SANE_BACKENDS setting for building the xerox_mfp backend	0
sanitize	Enable asan, msan and usan sanitizers. Your compiler must support them	3
sasl	Add support for the Simple Authentication and Security Layer	52
savedconfig	Use this to restore your config from /etc/portage/savedconfig ${CATEGORY}/${PN}. Make sure your USE flags allow for appropriate dependencies	5
scanner	Add support for scanner hardware (e.g. build the sane frontend in kdegraphics)	9
scim	Enable Smart Common Input Method	3
scotch	Enable matrix ordering with <pkg>sci-libs/scotch</pkg>	4
screen	Enable support for running domain U console in an <pkg>app-misc/screen</pkg> session	2
screencast	Enable support for remote desktop and screen cast using PipeWire	13
scripting	Adds scripting support	4
scripts	Install the scripts	7
sctp	Support for Stream Control Transmission Protocol	8
scxml	Install documentation for <pkg>dev-qt/qtscxml</pkg>	4
sddm	Install <pkg>x11-misc/sddm</pkg> display manager	2
sdk	Pull in <pkg>kde-plasma/plasma-sdk</pkg> for Plasma development	8
sdl	Add support for Simple Direct Layer (media library)	84
sdl2	Add support for Simple Direct Layer 2.0 (<pkg>media-libs/libsdl2</pkg>)	4
sdl3	Build against SDL3 using <pkg>media-libs/libsdl3</pkg>.	2
seccomp	Enable seccomp (secure computing mode) to perform system call filtering at runtime to increase security of programs	39
secureboot	Automatically sign efi executables using user specified key	0
security	Adds access to services related to ID management and security auditing.	2
selinux	!!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur	411
semantic-desktop	Cross-KDE support for semantic search and information retrieval	7
sendmail	Allow sudo to send emails with sendmail	2
sensors	Pull in bindings for the QtSensors module	5
sequoia	Symlink to <pkg>app-crypt/sequoia-chameleon-gnupg</pkg>.	2
serial	include serial port support	7
serialbus	Build QtSerialBus modules	2
serialport	Build QtSerialPort modules	4
server	Build server (mysqld)	59
session	Add persistent session support	9
sftp	Enables SFTP support with <pkg>net-libs/libssh</pkg>	10
shaderc	Use <pkg>media-libs/shaderc</pkg> to compile GLSL	3
shadow	Add shadow support	7
shapefile	Enable support for ESRI shapefiles	2
shaper	Support for traffic shaping	2
share	Enable support for a share menu using <pkg>kde-frameworks/purpose</pkg>	11
shared	Build shared library	18
shm	Obtain refclock info from shared memory-segment	6
shortcuts	Build the "shortcuts" plugin	3
shout	Enable broadcasting support via <pkg>media-libs/libshout</pkg>	5
sid	Enable SID (Commodore 64 audio) file support	7
sieve	Build plugin for sieve filter support	4
sixel	Enable sixel support	3
skey	Enable S/Key (Single use password) authentication support	2
skk	Enable support for <pkg>app-i18n/skk-jisyo</pkg>	2
slang	Add support for the slang text display library (it's like ncurses, but different)	9
slirp	Enable TCP/IP in hypervisor via <pkg>net-libs/libslirp</pkg>	2
smart	Pull in <pkg>kde-plasma/plasma-disks</pkg> for disk health monitoring	3
smartcard	Enable smartcard support	16
smime	Enable experimental S/MIME support	3
smp	Enable support for multiprocessors or multicore systems	4
sms	Enable SMS support (build smsd)	2
smtp	Provide SMTP support	6
snap	Enable support for snap packages using <pkg>app-containers/snapd</pkg>	2
snappy	Enable support for Snappy compression (as implemented in app-arch/snappy)	12
sndfile	Add support for libsndfile	28
sndio	Enable support for the <pkg>media-sound/sndio</pkg> backend	22
snmp	Add support for the Simple Network Management Protocol if available	32
soc	Apply additional patches for efficient playback on some SoCs (e.g. ARM, RISC-V)	4
sockets	Add support for tcp/ip sockets	3
socks5	Add support for the socks5 proxy	10
sodium	Use <pkg>dev-libs/libsodium</pkg> for cryptography	8
sound	Enable sound support	36
soup	Compile support for REST server (<pkg>net-libs/libsoup</pkg>)	2
source	Zip the sources and install them	15
sourceview	Enable GtkSourceView (<pkg>x11-libs/gtksourceview</pkg>) support	4
sox	Add support for Sound eXchange (SoX)	8
soxr	Enable SoX Resampler support via <pkg>media-libs/soxr</pkg>	5
spamassassin	Enables <pkg>mail-filter/spamassassin</pkg> support	6
spandsp	Use <pkg>media-libs/spandsp</pkg> for for G.722 and G.726 codec support in the RTP Player	2
sparse	Enable support for sparse matrix algebra with various packages from SuiteSparse	11
sparsehash	Add test support for GoogleHash (<pkg>dev-cpp/sparsehash</pkg>)	2
speech	Enable text-to-speech support	24
speex	Add support for the speex audio codec (used for speech)	20
spell	Add dictionary support	33
spf	Use the <pkg>mail-filter/libspf2</pkg> for Sender Policy Framework checking	2
sphinx	Enable document generation by <pkg>app-misc/sphinx</pkg>	2
spice	Enable Spice protocol support via <pkg>app-emulation/spice</pkg>	3
spirv	Build SPIR-V support	2
split-usr	Enable behavior to support maintaining /bin, /lib*, /sbin and /usr/sbin separately from /usr/bin and /usr/lib*	23
spqr	Add test support for SPQR (<pkg>sci-libs/spqr</pkg>)	2
sql	Enable storage of financial data in SQL Db via <pkg>dev-qt/qtbase</pkg>[sql]	9
sqlcipher	Enable SQLite3 database encryption support via <pkg>dev-db/sqlcipher</pkg>	2
sqlite	Add support for sqlite - embedded sql database	113
sr		3
srtp	Enable support for encrypted voice transmission (secure RTP)	2
sse4_2		5
ssh	Enable SSH based block device support via <pkg>net-libs/libssh2</pkg>	20
ssh-agent	Use KeePassXC to unlock SSH keys	2
ssl	Add support for SSL/TLS connections (Secure Socket Layer / Transport Layer Security)	291
sslv2	Support for the old/insecure SSLv2 protocol -- note: not required for TLS/https	2
sslv3	Support for the old/insecure SSLv3 protocol -- note: not required for TLS/https	2
ssp	When enabled, Embree compiles with stack protection against return address overrides. Stack protection will wield a minor performance decrease in return for higher security.	3
sssd	Add System Security Services Daemon support	2
standalone	Enable standalone mode with built-in DHCP client and DNS handling"	4
startup-notification	Enable application startup event feedback mechanism	12
static	!!do not set this during bootstrap!! Causes binaries to be statically linked instead of dynamically	109
static-libs	Build static versions of dynamic libraries as well	615
statistics	Enable compution of statistics	2
stats	Enable statistic reporting	6
stemmer	Enable language stemming support	6
stream	Add support for streaming Video to Android client	3
strip	Allow symbol stripping to be performed by the ebuild for special files	7
su	Install the su program	3
subversion	Enable subversion (version control system) support	9
sudo	Enable sudo helper integration	3
suid	Enable setuid root program(s)	36
sundials	Add support for sundials (<pkg>sci-libs/sundials</pkg>)	2
superlu	Add support for superlu (<pkg>sci-libs/superlu</pkg>)	4
sv		3
svg	Add support for SVG (Scalable Vector Graphics)	57
svm	Enable support for the Support Vector Machine library <pkg>sci-libs/libsvm</pkg>	2
svt-av1	Enable <pkg>media-libs/svt-av1</pkg> video codec support	6
swig	Enable SWIG usage, needed for Java and Python bindings	2
swing	Enable Swing Ant tasks	2
symengine	Add support for a <pkg>dev-python/symengine</pkg> backend	2
symlink	Force kernel ebuilds to automatically update the /usr/src/linux symlink	10
sync	Enable "task sync" support	2
syslog	Enable support for syslog	18
sysprof	Enable profiling data capture support using <pkg>dev-util/sysprof-capture</pkg>	17
system-av1	Use the system-wide <pkg>media-libs/dav1d</pkg> and <pkg>media-libs/libaom</pkg> library instead of bundled	3
system-bootstrap	Bootstrap using installed openjdk	2
system-ffmpeg	Use system ffmpeg instead of the bundled one	2
system-harfbuzz	Use the system-wide <pkg>media-libs/harfbuzz</pkg> instead of bundled and <pkg>media-gfx/graphite2</pkg> in most cases	4
system-icu	Use system <pkg>dev-libs/icu</pkg> instead of the bundled one	7
system-init	Installed as a provider of virtual/service-manager.	2
system-jpeg	Use the system-wide <pkg>media-libs/libjpeg-turbo</pkg> instead of bundled.	3
system-libevent	Use the system-wide <pkg>dev-libs/libevent</pkg> instead of bundled	3
system-libvpx	Use the system-wide <pkg>media-libs/libvpx</pkg> instead of bundled.	3
system-lua	Use <pkg>dev-lang/lua</pkg> instead of the bundled liblua	2
system-pipewire	Use system <pkg>media-video/pipewire</pkg> for WebRTC and screencast instead of bundled one	2
system-png	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)	3
system-sqlite	Use the system-wide <pkg>dev-db/sqlite</pkg> installation	5
system-webp	Use the system-wide <pkg>media-libs/libwebp</pkg> instead of bundled.	2
systemd	Enable use of systemd-specific libraries and features like socket activation or session tracking	262
systemtap	Enable SystemTap/DTrace tracing	14
systray	Enable System Tray Icon support	3
szip	Use the szip compression library	6
t1lib	Enable the Type-1 fonts for the build-in DVI viewer (<pkg>media-libs/t1lib</pkg>)	2
taglib	Enable tagging support with taglib	20
tbb	Enable Parallel backend with <pkg>dev-cpp/tbb</pkg>	18
tcl	Add support the Tcl language	28
tcmalloc	Use the dev-util/google-perftools libraries to replace the malloc() implementation with a possibly faster one	20
tcp	Support iSCSI over TCP	2
tcpd	Add support for TCP wrappers	45
tcpdump	Use <pkg>net-analyzer/tcpdump</pkg>	2
tdb	Enables Trivial Database support for caching purposes.	2
teamd	Enable Teamd control support	4
telemetry	Send anonymized usage information to upstream so they can better understand our users	16
telepathy	Load contacts from the Telepathy framework	2
telnet	Compile with Telnet server support	3
templates	Document templates	2
terminal	Install <pkg>x11-terms/qterminal</pkg> package	4
terminfo	Use the terminfo package for POSIX consoles.	2
test	Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)	2581
test-full	Allow tests that rely on options not normally enabled	24
test-install	Install testsuite for manual execution by the user	3
test-programs	Install standalone test programs	3
test-rust	Enable important test dependencies that require Rust toolchain	20
testprograms	Build and install programs for testing OpenCV (performance)	2
text	Add support for text backend	6
textures	Include high resolution (640x480) backgrounds, briefing images and fonts (Descent 1)	3
tfo	Enable TCP Fast Open client+server	3
tftp	Enables built in TFTP server for netbooting.	3
tga	Enables Targa video output	2
themes	Install optional themes	7
theora	Add support for the Theora Video Compression Codec	14
threaded	Build with the threaded runtime for improved performance. Users with bootstrap compilers which don&#39;t support the threaded runtime should disable this flag.	2
threads	Add threads support for various packages. Usually pthreads	123
thunar	Install the Thunar plugin.	2
tiff	Add support for the TIFF image format	75
time64	Use 64-bit time_t type instead of the regular 32-bit type. This flag is forced on time64 profiles, and masked elsewhere. It should be only used when detection of type width is not possible (e.g. for SRC_URI)	0
timezone	Add dependency over <pkg>dev-ruby/tzinfo</pkg> to enable the "time" plugin for rbot. If the USE flag is disabled the plugin is also disabled by default.	2
timidity	Build with Timidity++ (MIDI sequencer) support	10
tk	Add support for Tk GUI toolkit	45
tls-heartbeat	Enable the Heartbeat Extension in TLS and DTLS	2
tokyocabinet	Enable support for <pkg>dev-db/tokyocabinet</pkg> db backend	6
toolbar	Enable the xterm toolbar to be built	2
tools	Build cli tools such as gnutls-cli, certtool and oscptool	135
tpm	Enable TPM support via <pkg>app-crypt/tpm2-tss</pkg> and build tpm2d.	8
tr	Turkey (Digiturk) tv listing grabber	4
trace	Build with tracing capabilities	3
tracing	Build plugins for tracing requiring extra dependencies (AppStatisticsMonitor, CtfVisualizer, PerfProfiler, QmlProfiler)	3
tracker	Build the tracker search bar applet	8
trashquota	Count deleted messages as part of the maildir quota	2
tray	Enable support for tray	3
trayicon	Enable system tray icon	3
tre	Enable support for TRE, a lightweight, robust, and efficient POSIX compliant regexp matching library	5
tree-sitter	Support the <pkg>dev-libs/tree-sitter</pkg> parsing library	2
tremor	Use <pkg>media-libs/tremor</pkg> instead of <pkg>media-libs/libvorbis</pkg> for OGG Vorbis support	11
truetype	Add support for FreeType and/or FreeType2 fonts	67
tslib	Enable <pkg>x11-libs/tslib</pkg> for touchscreen events	2
tutorials	Builds and installs tutorials.	2
twolame	Enables twolame support (MPEG Audio Layer 2 encoder)	10
ubsan	Enable clang's Undefined Behavior Sanitizer functionality. Expect longer compile time.	2
uchardet	Use <pkg>app-i18n/uchardet</pkg>, which is upstreams default, instead of <pkg>dev-libs/icu</pkg>, which makes impossible to run tests.	5
ucx	Enable Unified Communication X library support	2
udev	Enable virtual/udev integration (device discovery, power and storage device support, etc)	85
udisks	Enable storage management support (automounting, volume monitoring, etc)	7
udunits	Add support for manipulating units of physical quantities	2
uefi	Enable support for the Unified Extensible Firmware Interface	9
uefi32	Compile a EFI32-bootable 32bit memtest image	2
uefi64	Compile a UEFI-bootable 64bit memtest image	2
ufw	Build <pkg>net-firewall/ufw</pkg> backend	2
uinput	Enable support for uinput	2
uk		3
ukify	Enable systemd-ukify	3
umfpack	Add test support for UMFPACK (<pkg>sci-libs/umfpack</pkg>)	2
unbound	Enable improved DNS core (SRV, NAPTR) by use of libunbound	3
unicode	Add support for Unicode	65
unsupported	enable unsupported and/or broken game engines (you're on your own)	3
unwind	Add support for call stack unwinding and function name resolution	28
upnp	Enable UPnP port mapping support	21
upnp-av	Enable UPnP audio/video streaming support	3
upower	Enable power management support	13
urandom	Use /dev/urandom instead of /dev/random	5
uring	Build with support for <pkg>sys-libs/liburing</pkg> AIO backend	4
usb	Add USB support to applications that have optional USB support (e.g. cups)	43
usbredir	Use <pkg>sys-apps/usbredir</pkg> to redirect USB devices to another machine over TCP	2
utempter	Include utmp management support via <pkg>sys-libs/libutempter</pkg>	6
utils	Install command-line PDF converters and various utilities	32
uuid	Use UUID for session identification instead of IP address and system time.	8
uwsgi_plugins_alarm_curl	Plugin to send a logline to a curl url.	0
uwsgi_plugins_alarm_xmpp	Plugin to send a logline via XMPP/Jabber (see http://uwsgi-docs.readthedocs.org/en/latest/AlarmSubsystem.html).	0
uwsgi_plugins_cache	Enable the caching framework	0
uwsgi_plugins_carbon	Send uWSGI's internal statistics to one or more Carbon servers	0
uwsgi_plugins_cheaper_busyness	Implement cheaper algorithm that adds or remove workers based on average utilization for given time period	0
uwsgi_plugins_clock_monotonic	Modular clock source, uses clock_gettime with CLOCK_REALTIME	0
uwsgi_plugins_clock_realtime	Modular clock source, uses clock_gettime with CLOCK_MONOTONIC	0
uwsgi_plugins_curl_cron	Call a curl url directly from a cron task	0
uwsgi_plugins_dumbloop	Run apps which do not require sockets	0
uwsgi_plugins_echo	Returns requests as they were sent	0
uwsgi_plugins_emperor_amqp	Enable an emperor controlled via AMQP	0
uwsgi_plugins_emperor_pg	Enable an emperor getting its configuration from a PostgreSQL database	0
uwsgi_plugins_emperor_zeromq	Enable an emperor controlled via ZeroMQ	0
uwsgi_plugins_fastrouter	Proxy/load-balancer/router speaking the uwsgi protocol	0
uwsgi_plugins_forkptyrouter	Pseudoterminal server to connect to instances running inside a jail/separate namespace	0
uwsgi_plugins_geoip	Export GeoIP information as routing variables (requires dev-libs/geoip)	0
uwsgi_plugins_graylog2	Send logs to a Graylog2 server in Graylog2's native GELF format	0
uwsgi_plugins_http	make uWSGI natively speak HTTP, using this plugin you do not need a front-end HTTP server	0
uwsgi_plugins_ldap	Lets you configure the uWSGI server via LDAP	0
uwsgi_plugins_legion_cache_fetch	caching for the legion subsystem	0
uwsgi_plugins_logcrypto	Send encrypted log messages via UDP	0
uwsgi_plugins_logfile	Enable logging to logfiles (requires USE=ssl)	0
uwsgi_plugins_logpipe	Log to stdin of a newly forked process	0
uwsgi_plugins_logsocket	Log to a unix socket	0
uwsgi_plugins_mongodblog	Write logs to a mongodb server	0
uwsgi_plugins_nagios	To monitor, and eventually get warning messages, via Nagios	0
uwsgi_plugins_notfound	Log 404 errors	0
uwsgi_plugins_pam	Support PAM authentication	0
uwsgi_plugins_ping	pings a uwsgi server	0
uwsgi_plugins_rados	serve objects stored in a Ceph cluster directly using the librados API	0
uwsgi_plugins_rawrouter	Enable routing requests to a specific plugin/application/function using the request modifiers	0
uwsgi_plugins_redislog	Log to a redis server	0
uwsgi_plugins_router_access	uWSGI internal routing, simple access support	0
uwsgi_plugins_router_basicauth	uWSGI internal routing, basicauth support	0
uwsgi_plugins_router_cache	uWSGI internal routing, cache support	0
uwsgi_plugins_router_expires	uWSGI internal routing, expires headers support	0
uwsgi_plugins_router_hash	uWSGI internal routing, URL hash support	0
uwsgi_plugins_router_http	uWSGI internal routing, http headers support	0
uwsgi_plugins_router_memcached	uWSGI internal routing, memcached support	0
uwsgi_plugins_router_metrics	uWSGI internal routing, metrics subsystem support	0
uwsgi_plugins_router_radius	uWSGI internal routing, radius auth support	0
uwsgi_plugins_router_redirect	uWSGI internal routing, simple redirect support	0
uwsgi_plugins_router_redis	uWSGI internal routing, redis support	0
uwsgi_plugins_router_rewrite	uWSGI internal routing, URL rewrite support	0
uwsgi_plugins_router_spnego	uWSGI internal routing, spnego auth support	0
uwsgi_plugins_router_static	uWSGI internal routing, static files serving support	0
uwsgi_plugins_router_uwsgi	uWSGI internal routing,	0
uwsgi_plugins_router_xmldir	uWSGI internal routing,	0
uwsgi_plugins_rpc	Allow calling functions on a remote uWSGI server/cluster	0
uwsgi_plugins_rrdtool	Store uWSGI stats in a rrd fashion	0
uwsgi_plugins_rsyslog	Send logs to Unix standard syslog residing on a remote server	0
uwsgi_plugins_signal	Enable the signal framework to allow event based inter process communication	0
uwsgi_plugins_spooler	Enable queue management that works like a printing/mail system, available for python/perl/ruby	0
uwsgi_plugins_sqlite	Configure uWSGI via a sqlite database	0
uwsgi_plugins_ssi	Fast templating system that has access to the uWSGI API	0
uwsgi_plugins_sslrouter	Permits routing/proxy of SSL requests	0
uwsgi_plugins_stats_pusher_statsd	Part of the metrics subsystem, lets you push metrics to a statsd server	0
uwsgi_plugins_symcall	Allows you to write native uWSGI request handlers without the need of developing a full uWSGI plugin	0
uwsgi_plugins_syslog	Enable logging to standard Unix syslog	0
uwsgi_plugins_systemd_logger	Enable logging via systemd journal	0
uwsgi_plugins_transformation_chunked	Filter the response generated by your application, encode the output in HTTP chunked	0
uwsgi_plugins_transformation_gzip	Filter the response generated by your application, compress in gzip	0
uwsgi_plugins_transformation_offload	Filter the response generated by your application, buffer streaming offload	0
uwsgi_plugins_transformation_tofile	Filter the response generated by your application, caching buffer to a static file	0
uwsgi_plugins_transformation_toupper	Filter the response generated by your application, transforming each character in uppercase	0
uwsgi_plugins_tuntap	Ad-hoc solution for giving network connectivity to Linux processes running in a dedicated network namespace	0
uwsgi_plugins_ugreen	Use green threads on top of the uWSGI async platform	0
uwsgi_plugins_webdav	Build the WebDAV server (note: attributes are stored in extended attributes)	0
uwsgi_plugins_xattr	Exposes extended file attributes as router variables	0
uwsgi_plugins_xslt	Apply XSL transformation on XML documents on the fly (requires dev-libs/libxslt)	0
uwsgi_plugins_zabbix	Send statistics to a zabbix server (uwsgi behaves directly as a zabbix agent)	0
uwsgi_plugins_zergpool	Allow grouping zerg instances and attach them to different zerg servers	0
v4l	Enable support for video4linux (using linux-headers or userspace libv4l libraries)	26
vaapi	Enable Video Acceleration API for hardware decoding	25
vala	Enable bindings for dev-lang/vala	83
valgrind	Enable annotations for accuracy. May slow down runtime slightly. Safe to use even if not currently using dev-debug/valgrind	51
vamp	Enables vamp plugins support (Audio analysing plugins)	2
vanilla	Do not add extra patches which change default behaviour; DO NOT USE THIS ON A GLOBAL SCALE as the severity of the meaning changes drastically	17
vc	Enable VectorCompiler for a better performance.	2
vcd	Video CD support	5
vde	Enable virtual networking through <pkg>net-misc/vde</pkg>.	5
vdpau	Enable the Video Decode and Presentation API for Unix acceleration interface	13
vdr	Build the VDR plugin	3
verify-provenance	Verify provenance of PyPI distfiles (verifies that the artifact comes from upstream source repository)	0
verify-sig	Verify upstream signatures on distfiles	12
vi		3
video	Enable video support using ffmpeg	10
video_cards_		5
video_cards_amdgpu	VIDEO_CARDS setting to build driver for AMDGPU video cards	12
video_cards_d3d12	VIDEO_CARDS setting to build driver for Microsoft WSL video cards	0
video_cards_exynos	VIDEO_CARDS setting to build driver for Samsung Exynos video cards	0
video_cards_freedreno	VIDEO_CARDS setting to build reverse-engineered driver for Qualcomm Adreno cards	3
video_cards_i965	VIDEO_CARDS setting to build driver for Intel i965 video cards	0
video_cards_imagination	VIDEO_CARDS setting to build driver for Imagination video cards	0
video_cards_intel	VIDEO_CARDS setting to build driver for Intel video cards	4
video_cards_lavapipe	VIDEO_CARDS setting to build Vulkan software rasterizer using LLVMpipe	0
video_cards_lima	VIDEO_CARDS setting to build driver for Mali 200/400 video cards	0
video_cards_nouveau	VIDEO_CARDS setting to build reverse-engineered driver for nvidia cards	5
video_cards_nvidia	VIDEO_CARDS setting to build driver for nvidia video cards	17
video_cards_nvk	VIDEO_CARDS setting to build nouveau vulkan driver for nvidia cards (Turing and newer)	0
video_cards_omap	VIDEO_CARDS setting to build DRM driver for TI OMAP video cards	0
video_cards_r100	VIDEO_CARDS setting to build only r100 based chips code for radeon	0
video_cards_r200	VIDEO_CARDS setting to build only r200 based chips code for radeon	0
video_cards_r300	VIDEO_CARDS setting to build only r300, r400 and r500 based chips code for radeon	0
video_cards_radeon	VIDEO_CARDS setting to build driver for ATI radeon video cards	2
video_cards_radeonsi	VIDEO_CARDS setting to build only Southern Islands based chips code for radeon	2
video_cards_v3d	VIDEO_CARDS setting to build driver for v3d video cards	0
video_cards_vesa	VIDEO_CARDS setting to build driver for vesa video cards	2
video_cards_via	VIDEO_CARDS setting to build driver for via video cards	0
video_cards_virgl	VIDEO_CARDS setting to build driver for virgil (virtual 3D GPU)	0
video_cards_virtualbox	VIDEO_CARDS setting to build driver for virtualbox emulation	0
video_cards_vivante	VIDEO_CARDS setting to build etnaviv driver for vivante video cards	0
video_cards_vmware	VIDEO_CARDS setting to build driver for vmware video cards	0
video_cards_zink	VIDEO_CARDS setting to build Zink OpenGL-over-Vulkan Gallium driver	0
videos	Install optional video files (used in some games)	7
vidix	Enable support for vidix video output.	2
vidstab	Enabled video stabilization with <pkg>media-libs/vidstab</pkg>	3
viewer	Build the GTK+-based video viewer.	3
vim	Install the vifm vim plugin and vim-compatible documentation	3
vim-syntax	Pulls in related vim syntax scripts	22
virtualkeyboard	Install documentation for <pkg>dev-qt/qtvirtualkeyboard</pkg>	2
visio	Add support for visio format using <pkg>media-libs/libvisio</pkg>	2
vmaf	Enable Netflix's Perceptual video quality assessment via <pkg>media-libs/libvmaf</pkg>	2
vmware	Enable bareos-fd VMware plugin	2
vnc	Enable VNC (remote desktop viewer) support	16
vocoder	Phase vocoder effect plugin	2
voice	Adds VoIP support	4
vorbis	Add support for the OggVorbis audio codec	74
vpx	Add support for VP8/VP9 codecs (usually via media-libs/libvpx)	15
vst	Support LinuxVST plugins	3
vte	Enable terminal support (<pkg>x11-libs/vte</pkg>) in the GTK+ interface	3
vtk	Build new 3D visualization module viz based on <pkg>sci-libs/vtk</pkg>	6
vulkan	Add support for 3D graphics and computing via the Vulkan cross-platform API	45
wallpapers	Install sway's default wallpaper image	2
wav	Enable wav audio codec support	8
wavpack	Add support for wavpack audio compression tools	21
wayland	Enable dev-libs/wayland backend	180
weather	Enable optional weather calendar support	3
web	Install client with Web UI	7
webcam	Enable webcam support via opencv	4
webchannel	Build bindings for the QtWebChannel module	4
webdav	Support for folder-sharing between guest and client using <pkg>net-libs/phodav</pkg>	9
webengine	Build browser integration for the editor, requires <pkg>dev-qt/qtwebengine</pkg>	36
webkit	Add support for the WebKit HTML rendering/layout engine	18
webp	Add support for the WebP image format	51
webrtc	Enable use of <pkg>media-plugins/gst-plugins-webrtc</pkg> for various voice-enhancement FX	3
webserver	Enable support to act as a webserver serving conkys output using <pkg>net-libs/libmicrohttpd</pkg>	2
websocket	Build with WebSocket API support.	2
websockets	Support the WebSocket protocol.	11
webui	Enable the Web UI	3
webview	Install documentation for <pkg>dev-qt/qtwebview</pkg>	2
wext	Enable support for the deprecated Wext (Wireless Extensions) API; needed for some older drivers (e.g. ipw2200, ndiswrapper)	2
widgets	Build Qt6Widgets module	9
wifi	Enable wireless network functions	12
wildmidi	Enable support for MIDI via <pkg>media-sound/wildmidi</pkg>	2
wmf	Add support for the Windows Metafile vector image format	6
wpg	Add support for wpg format using <pkg>app-text/libwpg</pkg>	2
wps	Add support for wps format using <pkg>app-text/libwps</pkg>	3
wrapper	Install a wrapper to allow using `podman` as a drop-in replacement for `docker`	2
wxwidgets	Add support for wxWidgets/wxGTK GUI toolkit	14
x264	Enable H.264 encoding using x264	13
x265	Support X265 Encoder	10
xapian	Enable Xapian search engine support	3
xattr	Add support for extended attributes (filesystem-stored metadata)	32
xcb	Support the X C-language Binding, a replacement for Xlib	2
xcb-errors	Better error reporting when using xwayland	2
xcf	Enable XCF image loader	2
xcomposite	Enable support for the Xorg composite extension	5
xcrypt	Enable crypt through <pkg>sys-libs/libxcrypt</pkg> package	2
xdg	Ensure XDG Semantics for returned paths via <pkg>x11-misc/xdg-user-dirs</pkg>	6
xdp	Enable support for AF_XDP high performance packet processing	7
xemacs	Add support for XEmacs	3
xen	Enable extended xen support	7
xface	Add xface support used to allow a small image of xface format to be included in an email via the header 'X-Face'	4
xfce	Enable support for XFCE panel	5
xfs	Enable XFS specific disk preallocation support via <pkg>sys-fs/xfsprogs</pkg>	5
xft	Build with support for XFT font renderer (x11-libs/libXft)	19
xim	Enable X11 XiM input method	5
xine	Add support for the XINE movie libraries	3
xinerama	Add support for querying multi-monitor screen geometry through the Xinerama API	46
xinetd	Add support for the xinetd super-server	11
xkb	Allow to generate kernel keymaps based on xkb database from <pkg>x11-libs/libxkbcommon</pkg>	4
xls	Add xls support	3
xlsx	Add xlsx support	3
xml	Add support for XML files	64
xmlrpc	Support for xml-rpc library	3
xmp	Enable support for Extensible Metadata Platform (Adobe XMP)	13
xmpp	Enable support for Extensible Messaging and Presence Protocol (XMPP) formerly known as Jabber	6
xosd	Sends display using the X On Screen Display library	3
xpm	Add support for XPM graphics format	19
xpresent	Enable <pkg>x11-libs/libXpresent</pkg> support	3
xps	Add support for XPS file format through <pkg>app-text/libgxps</pkg>.	3
xrandr	Enables support for Xrandr	13
xref	Install xref.lisp cross-referencing tool	3
xrender	Use XRender for alpha background pseudo-transparency.	4
xscreensaver	Add support for XScreenSaver extension	8
xslt	Enable the plugin for xslt	4
xtables_addons_account	ACCOUNT target is a high performance accounting system for large local networks	0
xtables_addons_asn	match a packet by its source or destination Autonomous System Number	0
xtables_addons_chaos	CHAOS target causes confusion on the other end by doing odd things with incoming packets	0
xtables_addons_condition	matches if a specific condition variable is (un)set	0
xtables_addons_delude	DELUDE target will reply to a SYN packet with SYN-ACK, and to all other packets with an RST	0
xtables_addons_dhcpmac	DHCPMAC target/match in conjunction with ebtables can be used to completely change all MAC addresses from and to a VMware-based virtual machine	0
xtables_addons_dnetmap	DNETMAP target allows dynamic two-way 1:1 mapping of IPv4 subnets	0
xtables_addons_echo	ECHO target sends back all packets it received	0
xtables_addons_fuzzy	matches a rate limit based on a fuzzy logic controller (FLC)	0
xtables_addons_geoip	match a packet by its source or destination country	0
xtables_addons_gradm	match packets based on grsecurity RBAC status	0
xtables_addons_iface	match allows to check interface states	0
xtables_addons_ipmark	IPMARK target allows mark a received packet basing on its IP address	0
xtables_addons_ipp2p	matches certain packets in P2P flows	0
xtables_addons_ipv4options	match against a set of IPv4 header options	0
xtables_addons_length2	matches the length of a packet against a specific value or range of values	0
xtables_addons_logmark	LOGMARK target will log packet and connection marks to syslog	0
xtables_addons_lscan	match detects simple low-level scan attemps based upon the packet's contents	0
xtables_addons_pknock	match implements so-called "port knocking", a stealthy system for network authentication	0
xtables_addons_proto	modifies the protocol number in IP packet header	0
xtables_addons_psd	match attempts to detect TCP and UDP port scans (derived from Solar Designer's scanlogd)	0
xtables_addons_quota2	match implements a named counter which can be increased or decreased on a per-match basis	0
xtables_addons_sysrq	SYSRQ target allows to remotely trigger sysrq on the local machine over the network	0
xtables_addons_tarpit	TARPIT target captures and holds incoming TCP connections using no local per-connection resources	0
xtpax	Enable XATTR_PAX_FLAGS support.	2
xv	Add in optional support for the Xvideo extension (an X API for video playback)	12
xvid	Add support for xvid.org's open-source mpeg-4 codec	4
xvmc	Enable support for XVideo Motion Compensation (accelerated mpeg playback).	2
xwayland	Enable X11 application support in Wayland sessions	5
xxhash	Enable xxHash support in fmhash module (requires <pkg>dev-libs/xxhash</pkg>)	10
yaml	Enable YAML parsing support	11
yubikey	Enable database unlocking via hardware keys supporting YubiKey-style HMAC-SHA1 protocol	3
z3	Enable Z3 contraint solver support	3
zeroconf	Support for DNS Service Discovery (DNS-SD)	49
zeromq	enable zeromq message passing blocks	8
zfs	Enable ZFS backend storage <pkg>sys-fs/zfs</pkg>	4
zh-TW		2
zip	Enable support for ZIP archives	18
zlib	Add support for zlib compression	150
zmq	Enable support for ZeroMQ through <pkg>net-libs/zeromq</pkg>	2
zstd	Enable support for ZSTD compression	82

Category USE flags

acct-user

Flag	Description	Packages
icingaweb2	Prepare group membership for <pkg>www-apps/icingaweb2</pkg>	2
mgraph	Prepare group membership for <pkg>net-mail/mailgraph</pkg>	2

app-accessibility

Flag	Description	Packages
mbrola	Adds support for mbrola voices	2

app-admin

Flag	Description	Packages
portage	Add support for package state enforcement using <pkg>sys-apps/portage</pkg>	2
puppetdb	Adds puppetdb support	2

app-alternatives

Flag	Description	Packages
busybox	Symlink to <pkg>sys-apps/busybox</pkg>	2
gnu	Symlink to GNU bc (<pkg>sys-devel/bc</pkg>)	3

app-arch

Flag	Description	Packages
natspec	Use <pkg>dev-libs/libnatspec</pkg> to correctly decode non-ascii file names archived in Windows.	3

app-backup

Flag	Description	Packages
logwatch	Install support files for <pkg>sys-apps/logwatch</pkg>	2
ndmp	Support for the NDMP protocol	2

app-containers

Flag	Description	Packages
rootless	Enable libsubid (subuid/subgid mapping) for rootless	3

app-crypt

Flag	Description	Packages
tofu	Enable support for Trust on First use trust model; requires <pkg>dev-db/sqlite</pkg>.	2
user-socket	try a socket directory which is not removed by init manager at session end	2
wks-server	Install the wks-server	2

app-dicts

Flag	Description	Packages
"en-AU"		2
"en-CA"		2
"en-GB"		2
"en-US"		2

app-doc

Flag	Description	Packages
htmlsingle	Install all-on-one-page HTML version.	2

app-editors

Flag	Description	Packages
cscope	Enable cscope interface	2

app-emacs

Flag	Description	Packages
wanderlust	Add support for <pkg>app-emacs/wanderlust</pkg>	2

app-emulation

Flag	Description	Packages
arm64ec	Enable x86_64 emulation using arm64ec	4
crossdev-mingw	Use <pkg>sys-devel/crossdev</pkg> for the toolchain rather than <pkg>dev-util/mingw64-toolchain</pkg> (requires manual setting up and is mostly unsupported, try disabling if have issues)	5
dos	Pull in <pkg>games-emulation/dosbox</pkg> to run DOS applications	2
dtrace	Install dtrace Extension Pack.	3
gecko	Enable mshtml support using <pkg>app-emulation/wine-gecko</pkg>	3
iscsi	Allow using an iSCSI remote storage server as pool for disk image storage	2
mingw	Build PE files using <pkg>dev-util/mingw64-toolchain</pkg> (more tested) rather than <pkg>llvm-core/clang</pkg> (newer)	3
osmesa	Allow images to be rendered in memory using the host CPU	2
vboxwebsrv	Build and install the VirtualBox webservice.	2
vmmraw	Enable 32-bit support on a 64-bit kernel.	2
wow64	Enable x86 (32-bit) emulation using wow64	4

app-i18n

Flag	Description	Packages
onlyplugin	Build only plugin	2
opencc	Enable support for <pkg>app-i18n/opencc</pkg>	3

app-misc

Flag	Description	Packages
lcd_devices_		2
lcd_devices_hd44780	Add support for Hitachi HD44780 and compatible displays	2
yq-symlink	Create a yq symlink to yq-python.	2

app-office

Flag	Description	Packages
goffice	Enable goffice plugin	2
holidays	Enable <pkg>kde-frameworks/kholidays</pkg> integration	2
libgda	Enable database support through <pkg>gnome-extra/libgda</pkg>.	2
offlinehelp	Install help files locally instead of using the LibreOffice Wiki	2

app-text

Flag	Description	Packages
dvi	Enable build-in DVI viewer	2
synctex	Enable search highlighting through synctex (<pkg>virtual/tex-base</pkg>)	3
system-mathjax	Use a system copy of mathjax	2
xetex	Add support for XeTeX macros (<pkg>dev-texlive/texlive-xetex</pkg>)	2

dev-ada

Flag	Description	Packages
static-pic	Build static library with pic code	20

dev-db

Flag	Description	Packages
jdbc	Enable the CONNECT engine to access foreign databases via JDBC	2
latin1	Use LATIN1 encoding instead of UTF8	2

dev-embedded

Flag	Description	Packages
gpiod	Build with libgpiod support via <pkg>dev-libs/libgpiod</pkg>	2

dev-games

Flag	Description	Packages
fox	Build examples using <pkg>x11-libs/fox</pkg> library	2
openinventor	Build OpenInventor plugin	2
osgapps	Build osg applications	2

dev-haskell

Flag	Description	Packages
binary-laws	Include infrastructure for testing class laws of binary type constructors. It is required that this flag match the value that the `unary-laws` flag was given when building `quickcheck-classes-base`. Disabling `unary-laws` while keeping `binary-laws` enabled is an unsupported configuration.	2
boundschecks	Enable bounds checking	2
devel	using tests for developers	3
exe	Enable @exe:yaml-test@ component	2
integer-gmp	Whether or not to use GMP for some functions	2
internalchecks	Enable internal consistency checks at the cost of a significant performance penalty	2
lukko	Use @lukko@ for file-locking	2
parsec	Add support for parsing with Parsec.	2
semigroupoids	You can disable the use of the `semigroupoids` package using `-f-semigroupoids`. This may be useful for accelerating builds in sandboxes for expert users.	3
semigroups	You can disable the use of the `semigroups` package using `-f-semigroups`. Disabing this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.	2
tagged	You can disable the use of the `tagged` package using `-f-tagged`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.	5
target-attributes	use GCC / clang function attributes instead of global target options.	2
template-haskell	Enable Template Haskell support	4
unary-laws	Include infrastructure for testing class laws of unary type constructors. It is required that this flag match the value that the `unary-laws` flag was given when building `quickcheck-classes-base`.	2
unsafechecks	Enable bounds checking in unsafe operations at the cost of a significant performance penalty	2
vector	Provide instances for vector	2

dev-java

Flag	Description	Packages
log4j	Add optional support for log4j	5

dev-lang

Flag	Description	Packages
clippy	Install clippy, Rust code linter	2
ensurepip	Install the ensurepip module that uses bundled wheels to bootstrap pip and setuptools (if disabled, it will be only possible to use venv `--without-pip`)	2
ffi	Enable the Foreign Function Interface (FFI) extension using <pkg>dev-libs/libffi</pkg>	2
moar	Build the MoarVM backend (experimental/broken)	2
rust-analyzer	Install rust-analyzer, A Rust compiler front-end for IDEs (language server)	2
rust-src	Install rust-src, needed by developer tools and for build-std (cross)	2
rustfmt	Install rustfmt, Rust code formatter	2

dev-libs

Flag	Description	Packages
conformance	Build conformance tests	2
cpu_flags_arm_aes	Use the AES cryptography instruction set	2
cpu_flags_arm_sha1	Use the SHA-1 cryptography instruction set	2
cpu_flags_arm_sha2	Use the SHA-2 cryptography instruction set	2
crnl-as-line-terminator	enable CR+NL as line terminator	2
pcre16	Build PCRE library for 16 bit characters (e.g. UTF-16).	2
pcre32	Build PCRE library for 32 bit characters (e.g. UTF-32).	2
rfc3779	Enable support for RFC 3779 (X.509 Extensions for IP Addresses and AS Identifiers)	2
stacktrace	Build the full Boost.Stacktrace dynamic library instead of relying on the header-only implementation	2
tls-compression	Enable support for discouraged TLS compression	2
verbose-debug	Support for verbose debug logging	2
weak-ssl-ciphers	Build support for SSL/TLS ciphers that are considered "weak"	2
xtest	Enable support for <pkg>x11-libs/libXtst</pkg>	2

dev-perl

Flag	Description	Packages
suggested	Install optional dependencies for extra tests	2
xs	Install <pkg>dev-perl/Text-CSV_XS</pkg> for accelerated decoding	8

dev-php

Flag	Description	Packages
igbinary	Enable support for the igbinary serializer	2

dev-python

Flag	Description	Packages
printsupport	Build QtPrintSupport module	3
pyqt6	Use <pkg>dev-python/pyqt6</pkg> as Qt for Python implementation	2
pyside6	Use <pkg>dev-python/pyside</pkg> as Qt for Python implementation	2
quick	Build QtQuick and QtQuickWidgets modules	4
spatialaudio	Build QtSpatialAudio module	3
testlib	Build bindings for the QtTest module	3

dev-qt

Flag	Description	Packages
eglfs	Build the EGL Full Screen/Single Surface platform plugin	2
qmlls	Build the qmlls tool using <pkg>dev-qt/qtlanguageserver</pkg>	2

dev-util

Flag	Description	Packages
bundled-jdk	Use bundled jdk	2
bundled-xvfb	Utilize the built in xvfb server. Requires purchased license from upstream.	3

games-action

Flag	Description	Packages
opl3-musicpack	Include alternate version of the game's music, recorded with the Yamaha YMF262 OPL3 soundchip	3
sc55-musicpack	Include alternate version of the game's music, recorded with the Roland Sound Canvas SC-55 MIDI module	3

games-emulation

Flag	Description	Packages
jgmodule	Build module for The Jolly Good API	3
mgba	Enables GBA controllers emulation with <pkg>games-emulation/mgba</pkg>	2
netplay	Enable netplay functionality	3

games-fps

Flag	Description	Packages
gog	Extract data files from the GOG.com version.	2
mumble	Adds player-location (positional audio) support to VoIP	2
rogue	Build support for the 'Ground Zero' Mission Pack (rogue)	2
xatrix	Build support for the 'The Reckoning' Mission Pack (xatrix)	2

games-strategy

Flag	Description	Packages
lobby	Enable the use of <pkg>net-libs/gloox</pkg> and the multiplayer lobby	2

kde-apps

Flag	Description	Packages
qalculate	Enable <pkg>sci-libs/libqalculate</pkg> backend support	2

kde-plasma

Flag	Description	Packages
ksysguard	Enable device notifier and system monitor applets as well as terminate applications runner	2
lock	Enable screen locking via <pkg>kde-plasma/kscreenlocker</pkg>	2

llvm-core

Flag	Description	Packages
multilib-symlinks	Install symlinks for all ABI CHOSTs. Note that this can result in gcc being overrode for native builds, as well as conflict with crossdev if used for the same targets.	3

llvm-runtimes

Flag	Description	Packages
llvm_targets_AMDGPU	AMDGPU target (supports R600 and GCN GPUs)	3
llvm_targets_NVPTX	NVIDIA PTX (GPU) target (32-bit and 64-bit)	3
offload	Install <pkg>llvm-runtimes/offload</pkg> for -fopenmp GPU offloading	2
ompt	Enable OpenMP Tools Interface support	2

mail-client

Flag	Description	Packages
autocrypt	Enable autocrypt.org support	2
notmuch	Enable support for <pkg>net-mail/notmuch</pkg>	2
ytnef	Enable optional TNEF attachments parser support using <pkg>net-mail/ytnef</pkg>	2

mail-mta

Flag	Description	Packages
dovecot-sasl	Adds support for Dovecot's authentication	2
eai	Add support for SMTPUTF8	2
gencertdaily	Generate SSL certificates daily instead of hourly	2
highvolume	Prepare netqmail for high volume servers	2

mate-extra

Flag	Description	Packages
applet	Enable building of the MATE applet.	2

media-fonts

Flag	Description	Packages
bdf	Install BDF fonts in addition to PCF	2
otf	Install OpenType font versions	7
ttf	Install TrueType font versions	7

media-gfx

Flag	Description	Packages
alembic	Add support for Alembic through <pkg>media-gfx/alembic</pkg>.	2
devil	Enables DevIL output plugin -Tdevil	2
fpx	Enable FlashPix support with <pkg>media-libs/libfpx</pkg>	2
manifold	Enable Manifold render backend via <pkg>sci-mathematics/manifold</pkg>	2
nanovdb	Enable nanoVDB support in Cycles. Uses less memory than regular openVDB when rendering.	2
q32	Set storage quantum size to 32 (~5*memory)	2
spacenav	Add support for space navigator devices through <pkg>dev-libs/libspnav</pkg>	2

media-libs

Flag	Description	Packages
10bit	Add support for building 10-bit and 12-bit AV1.	2
aacs	Add support for decryption of AACS	2
apps	Build the standalone denoise, self test, and benchmark binaries.	2
avx2:avx2		2
avx512dq		2
avx512f:avx512f		2
avx:avx		2
dumb	Enable <pkg>media-libs/dumb</pkg> module library support	2
gles1	include OpenGL ES 1.0 support	2
kms	Enable KMS support.	3
mod	basic support for MOD files	3
playtools	Install playwave and playmus tools (useful for testing)	3
ptex	Enable Ptex texture mapping system file support via <pkg>media-libs/ptex</pkg>	2
sse2		2
sse2:sse2		2
sse3:sse3		2
sse4_1:sse4.1		2
sse4_2:sse4.2		2
ssse3:ssse3		2
stb	Use bundled stb instead of <pkg>media-libs/libvorbis</pkg> for OGG Vorbis support	3
vis	Enables sparc vis support for libggi	2

media-radio

Flag	Description	Packages
hamlib	Enables support by the Hamlib amateur radio rig control library	3

media-sound

Flag	Description	Packages
acoustid	Build acoustic fingerprinting plugin using <pkg>media-libs/chromaprint</pkg>	2
aptx	aptX (HD) over Bluetooth (many Android compatible headphones)	2
calf	Enable use of <pkg>media-plugins/calf</pkg> for adding various FX	2
cover	Enable cover art fetching	2
dssi	Build the DSSI opcodes	4
id3tag	Enable support for ID3 tags via <pkg>media-libs/libid3tag</pkg>	6
ipod	Enable support for iPod device access	3
lastfm	Enable Last.fm streaming services support through <pkg>media-libs/liblastfm</pkg>	2
ldac	Enable support for AOSP <pkg>media-libs/libldac</pkg> dispatcher	2
mac	Enable support for decoding Monkey's Audio files	7
nsm	Build support for Non Session Manager	2
podcast	Enable gpodder.net podcast support via <pkg>media-libs/libmygpo-qt</pkg>	2
replaygain	Enable ReplayGain support, for relative volume adjustments	3
streaming	Enable playback of MPD HTTP streams using (<pkg>dev-qt/qtmultimedia</pkg>)	2
zamaudio	Enable use of <pkg>media-plugins/zam-plugins</pkg> for the maximizer FX	2

media-tv

Flag	Description	Packages
hdhomerun	Silicondust USA Inc.network-attached tuner support	2
xmltv	Support <pkg>media-tv/xmltv</pkg> TV listing - not used by Schedules Direct]	2

media-video

Flag	Description	Packages
amf	Enable AMD's Advanced Media Framework support via <pkg>media-video/amdgpu-pro-amf</pkg>	3
amrenc	Enable Adaptive Multi-Rate Audio encoding support via <pkg>media-libs/vo-amrwbenc</pkg>	2
appkit	Enable Apple AppKit framework	2
faac	Use external faac library for AAC encoding	2
gpl	Enable use of GPL licensed code, should be kept enabled unless LGPL binaries are needed	2
iec61883	Enable FireWire DV/HDV input device support via <pkg>media-libs/libiec61883</pkg>	2
libaribb24	Enable ARIB text and caption decoding via <pkg>media-libs/aribb24</pkg>	2
libilbc	Enable internet Low Bitrate Codec de/encoding support via <pkg>media-libs/libilbc</pkg>	2
libmpeg2	Build support for mpeg2 over <pkg>media-libs/libmpeg2</pkg> rather than using ffmpeg.	2
libplacebo	Enable use of GPU-accelerated filters from <pkg>media-libs/libplacebo</pkg>	3
librtmp	Enable Real Time Messaging Protocol support via <pkg>media-video/rtmpdump</pkg> in addition to FFmpeg's own implementation	2
live	Enables live.com streaming media support	2
qsv	Build with Intel Quick Sync Video support.	4
quicktime	Add support for OpenQuickTime	2
srt	Enable Secure Reliable Transport (SRT) support via <pkg>net-libs/srt</pkg>	4
system-service	Install systemd unit files for running as a system service. Not recommended.	2
vlc	Build with VLC media source support.	2
zimg	Enable libzimg support (for vf_fingerprint)	3
zvbi	Enable teletext decoding support via <pkg>media-libs/zvbi</pkg>	3

net-analyzer

Flag	Description	Packages
agent	Build "agent" installation target (see package description)	2
geoipv2	Enable support for GeoIP2 through <pkg>dev-libs/libmaxminddb</pkg>	2
gre	Enable GRE support	2
sguil	Enable sguil (The Analyst Console for Network Security Monitoring) support	3
smi	Build with <pkg>net-libs/libsmi</pkg> to load MIBs on the fly to decode SNMP packets	2

net-dns

Flag	Description	Packages
dnscrypt	Enable the ability to act as a DNSCrypt server	2
dnstap	Enable support for dnstap	7
doh	Enables dns-over-https	3
nsec3	Enable support for the NSEC3 Resource Record	2

net-fs

Flag	Description	Packages
ads	Enable Active Directory support and create cifs.idmap binary - idmap support	2

net-libs

Flag	Description	Packages
epoll	Support epoll() system call	2

net-mail

Flag	Description	Packages
maildrop	Filter spam using maildrop	2

net-misc

Flag	Description	Packages
adns	Add support for asynchronous DNS resolution	2
alaw	Install the sounds files for the alaw codec.	3
down-speed-100	Reduce speed to 100 Mbps in WOL-only modes	2
dri3	Build with DRI3 support	2
eee	Enable Energy-Efficient Ethernet by default	2
giga-lite	Enable support of "Giga Lite" (500 Mbps over just two CAT5 pairs) by default	2
hw-acceleration	Enable use of hardware acceleration by default. HW acceleration may cause problems on Realtek NICs!	2
iwd	Enable wifi support via <pkg>net-wireless/iwd</pkg>	2
ldns	Use LDNS for DNSSEC/SSHFP validation.	3
legacy-ciphers	Enable support for deprecated, soon-to-be-dropped DSA keys. See https://marc.info/?l=openssh-unix-dev&gt;m=170494903207436&gt;w=2.	2
metalink	Enable support for metalink.	3
multi-tx-q	Enable Multiple Tx Queue (&#34;RSS&#34; for sending)	2
pps	Support for the Linux Pulse Per Second (PPS) interface	2
s5-keep-mac	Keep set MAC address in S5 (switched off) by default	2
security-key	Include builtin U2F/FIDO support	2
siren14	Install the sounds files for the siren14 codec.	3
siren7	Install the sounds files for the siren7 codec.	3
sln16	Install the sounds files for the sln16 codec.	3
transcode	Install optional dependencies for transcoding support via <pkg>media-video/mplayer</pkg>	2
ulaw	Install the sounds files for the ulaw codec.	3
use-firmware	Enable support for automatic firmware loading	2
wol	Enable Wake-On-LAN by default	2
wol-s5	Enable start from S5 (switched off) by Wake-On-LAN by default	2
xmss	Enable XMSS post-quantum authentication algorithm	3

net-print

Flag	Description	Packages
foomatic	Build the included foomatic-rip printer driver. Strongly recommended.	2
ppds	Add support for automatically generated ppd (printing driver) files	2

net-wireless

Flag	Description	Packages
airspy	Build with Airspy support through <pkg>net-wireless/airspy</pkg>	3
bladerf	Add support for bladerf hardware	4
hackrf	use native backend which directly uses <pkg>net-libs/libhackrf</pkg>	4
plutosdr	Add support for Analog Devices ADALM-PLUTO hardware	2
sdrplay	use native backend which directly uses <pkg>net-wireless/sdrplay</pkg>	2
soapy	enable support for SoapySDR blocks	2
uhd	install UHD source and sink blocks	4
zerocopy	may cause a bus error on some ARM systems	2

sci-astronomy

Flag	Description	Packages
plplot	Build with <pkg>sci-libs/plplot</pkg> to allow diagnostic plots during processing	2

sci-biology

Flag	Description	Packages
emboss	Add support for the European Molecular Biology Open Software Suite	5

sci-electronics

Flag	Description	Packages
decode	Enable decoding of protocols while capturing	2
stpz	Rewrite .kicad_mod model refs from .step to .stpz to match <pkg>sci-electronics/kicad-packages3d</pkg>[stpz]	2

sci-libs

Flag	Description	Packages
cgns	Enables cgns output support	2
gfx942		2
gfx950		2
hipblaslt	Use <pkg>sci-libs/hipBLASLt</pkg> for some non-batched and strided batched problems	2
muparser	Add support for muparser (<pkg>dev-cpp/muParser</pkg>)	2
partition	Enable graph partitioning and graph-partition-based orderings through <pkg>sci-libs/metis</pkg> or <pkg>sci-libs/parmetis</pkg>	3
petsc	Add support for petsc (<pkg>sci-mathematics/petsc</pkg>)	3
pthread	Use pthread threadding model	2
qd	Use <pkg>sci-libs/qd</pkg> for quad-double datatype	3
scalapack	Add support for ScaLAPACK (<pkg>sci-libs/scalapack</pkg>)	2
slepc	Add support for slepc (<pkg>sci-mathematics/slepc</pkg>)	2

sci-mathematics

Flag	Description	Packages
clisp	Compile maxima with GNU CLISP (<pkg>dev-lisp/clisp</pkg>)	2
clozurecl	Add support for Clozure Common Lisp (<pkg>dev-lisp/clozurecl</pkg>)	2
cmucl	Add support for CMU Common Lisp (<pkg>dev-lisp/cmucl</pkg>)	2
complex-scalars	Make scalars complex	2
coq	Add <pkg>sci-mathematics/coq</pkg> support	2
ecl	Add support for Embeddable Common Lisp (<pkg>dev-lisp/ecl</pkg>)	2
gcl	Compile maxima with GNU Common Lisp (<pkg>dev-lisp/gcl</pkg>)	2
nauty	Use <pkg>sci-mathematics/nauty</pkg> to compute automorphism groups.	2
sbcl	Add support for Steel Bank Common Lisp (<pkg>dev-lisp/sbcl</pkg>)	2
sexp	Add support for outputting S-expressions with <pkg>dev-ml/ppx_sexp_conv</pkg>	2
zarith	Use Zarith (<pkg>dev-ml/zarith</pkg>) instead of Nums (<pkg>dev-ml/num</pkg>) for computations	2

sci-ml

Flag	Description	Packages
torch	Use pytorch	4

sci-physics

Flag	Description	Packages
fastjet	Adds support for <pkg>sci-physics/fastjet</pkg>	2
gdml	Enable geometry markup language for xml	2
geant3	Add compatibility for geant321 to geant4	2
hepmc3	Adds support for High Energy Physics Monte Carlo Generators 3 <pkg>sci-physics/hepmc</pkg>	2
highfive	Support <pkg>sci-libs/hdf5</pkg> and <pkg>sci-libs/highfive</pkg>	3
lhapdf	Support the use of external PDF sets via <pkg>sci-physics/lhapdf</pkg>	2
rivet	Support <pkg>sci-physics/rivet</pkg>	2

sci-visualization

Flag	Description	Packages
libcerf	Enable special functions from <pkg>sci-libs/libcerf</pkg>	2

sec-policy

Flag	Description	Packages
selinux_policy_types_mcs	Multi-Category Security policy	2
selinux_policy_types_mls	Multi-Level Security policy	2
selinux_policy_types_strict	Strict policy	2
selinux_policy_types_targeted	Targeted policy	2
unconfined	Enable support for the unconfined SELinux module	2

sys-apps

Flag	Description	Packages
boot	Install to /boot in addition to /usr/share/memtest86+/	3
kernel-install	Enable kernel-install	2
make-symlinks	Create all the appropriate symlinks in /bin and /sbin.	2
rtas	Add support for the Run Time Abstraction Services (RTAS)	3
sysv-utils	Install sysvinit compatibility symlinks for telinit, halt, poweroff, reboot, and shutdown	3

sys-boot

Flag	Description	Packages
bios	Enable legacy x86 BIOS/MBR boot support.	2

sys-cluster

Flag	Description	Packages
lttng	Add support for LTTng	2
munge	Enable authentication via munge	3

sys-devel

Flag	Description	Packages
default-gold	Set ld to point to ld.gold instead of ld.bfd	2
gold	Build ld.gold linker	2
gprofng	Enable the next-generation gprofng profiler	2

sys-fs

Flag	Description	Packages
dist-kernel-cap	Prevents upgrading to an unsupported kernel version when combined with USE=dist-kernel	2
rootfs	Enable dependencies required for booting off a pool containing a rootfs	2

sys-libs

Flag	Description	Packages
stack-realign	Realign the stack in the 32-bit build for compatibility with older binaries at some performance cost. Avoids crashes in older 32-bit binaries. Only affects x86/32-bit multilib builds on amd64.	3
tinfo	Build curses library (libncurses) sep from the low-level terminfo library (libtinfo) -- usually needed only for binary packages -- but it is binary compatible in either mode	2

sys-power

Flag	Description	Packages
modbus	Enable MODBUS support over USB	2

www-apps

Flag	Description	Packages
php_targets_php8-2	Build against PHP 8.2	2
php_targets_php8-3	Build against PHP 8.3	2
php_targets_php8-4	Build against PHP 8.4	2

www-client

Flag	Description	Packages
gmp-autoupdate	Allow Gecko Media Plugins (binary blobs) to be automatically downloaded and kept up-to-date in user profiles	3
mip	Install Microsoft Information Protection plugin.	3
widevine	Unsupported closed-source DRM capability (required by Netflix VOD)	4

x11-base

Flag	Description	Packages
xcsecurity	Build Security extension	2

x11-themes

Flag	Description	Packages
cinnamon	Install theme for <pkg>gnome-extra/cinnamon</pkg>	2

Local USE flags

acct-user

git

Flag	Description
gitea	Set home directory for git hosting via <pkg>www-apps/gitea</pkg>.

vdr

Flag	Description
graphlcd	Prepare group membership for <pkg>media-plugins/vdr-graphlcd</pkg>.
legacy-homedir	Keep old home directory /var/vdr of an existing installation. When this useflag is cleared, the home directory is switched to FHS conformant /var/lib/vdr

app-accessibility

at-spi2-core

Flag	Description
dbus-broker	Use DBus broker implementation instead of default DBus daemon
dbus-glib	Use dbus-glib for main loop integration

brltty

Flag	Description
beeper	support the console tone generator
fm	support for the sound card synthesizer
hid	support for opening and closing a HID device
louis	Use braille translator <pkg>dev-libs/liblouis</pkg>
pcm	support for sound card digital audio

espeak-ng

Flag	Description
klatt	Enables Klatt formant synthesis and implementation
sonic	Enable audio speed up support with <pkg>media-libs/sonic</pkg>

flite

Flag	Description
voices	Install synthetic voices

freetts

Flag	Description
jsapi	build Java Speech API (JSAPI)

orca

Flag	Description
braille	Enable braille support

app-admin

clsync

Flag	Description
clsync	Build clsync binary. Most likely you want it. However it is possible to build only libclsync without clsync itself.
extra-debug	Enable extra debugging. This will hurt performance badly. Be ready for tons of output.
extra-hardened	Enable extra security checks. This will hurt performance.
gio	Enable GIO for FS monitoring (glib based alternative to inotify interface, not recommended; if both are compiled, may be selected at runtime).
highload-locks	Allows to use spinlocks for short delays instead of mutexes, but only on SMP systems.
namespaces	Enable namespaces isolation.
socket-library	Build the control and monitoring socket library: libclsync.

conky

Flag	Description
apcupsd	Enable support for <pkg>sys-power/apcupsd</pkg>
bundled-toluapp	Enable support for bundled toluapp. This only makes sense in combination with the lua-* flags
cmus	Enable monitoring of music played by <pkg>media-sound/cmus</pkg>
colour-name-map	Include mappings of colour name
intel-backlight	Enable support for Intel backlight
iostats	Enable support for per-task I/O statistics
lua-cairo	Enable if you want Lua Cairo bindings
lua-cairo-xlib	Enable support for Cairo and Xlib interoperability for Lua
lua-imlib	Enable if you want Lua Imlib2 bindings
lua-rsvg	Enable if you want Lua RSVG bindings
moc	Enable monitoring of music played by <pkg>media-sound/moc</pkg>
mouse-events	Enable support for mouse events"
portmon	Enable support for tcp (ip4) port monitoring
thinkpad	Enable support for IBM/Lenovo notebooks
xinput	Enable support for Xinput 2 (slow)
xmms2	Enable monitoring of music played by <pkg>media-sound/xmms2</pkg>

conserver

Flag	Description
freeipmi	Compile in FreeIPMI support via <pkg>sys-libs/freeipmi</pkg>

diradm

Flag	Description
irixpasswd	Support for storing separate IRIX passwords

doas

Flag	Description
persist	Adds support for "persist" feature (experimental)

keepass

Flag	Description
aot	Generate native code at build time, rather than runtime.

keepassxc

Flag	Description
autotype	Add support to autotype the passwords into other applications
keeshare	Enable KeeShare sharing integration

logstash-bin

Flag	Description
x-pack	Enable additional features (may need a license)

pass

Flag	Description
importers	Allow importing passwords from other password managers using various contributed scripts.

passwordsafe

Flag	Description
qr	Enable QR code password display

perl-cleaner

Flag	Description
pkgcore	Use <pkg>sys-apps/pkgcore</pkg> instead of <pkg>sys-apps/portage</pkg> and <pkg>app-portage/portage-utils</pkg>.

puppet

Flag	Description
hiera	Enable hiera support

rsyslog

Flag	Description
clickhouse	Build the ClickHouse output module (requires <pkg>net-misc/curl</pkg>)
imdocker	Build the docker input module (requires <pkg>net-misc/curl</pkg>)
imhttp	Build the http input module (requires <pkg>www-servers/civetweb</pkg>)
impcap	Build the pcap input module (requires <pkg>net-libs/libpcap</pkg>)
kubernetes	Build the kubernetes modify plugin (requires <pkg>net-misc/curl</pkg>)
mdblookup	Build the MaxMind DB lookup message modify plugin using <pkg>dev-libs/libmaxminddb</pkg>
omhttp	Build the http output module (requires <pkg>net-misc/curl</pkg>)
omhttpfs	Build the httpfs output module (requires <pkg>net-misc/curl</pkg>)
omudpspoof	Build the udpspoof output module (requires <pkg>net-libs/libnet</pkg>)
relp	Build the Reliable Event Logging Protocol (RELP) output module (requires <pkg>dev-libs/librelp</pkg>)
rfc5424hmac	Build the rfc5424hmac modify module (requires <pkg>dev-libs/openssl</pkg>)
usertools	Installs the user tools (rsgtutil, rscryutil...) corresponding to the set USE flags

sagan

Flag	Description
libdnet	Add support for <pkg>dev-libs/libdnet</pkg>

salt

Flag	Description
cheetah	Enable support for <pkg>dev-python/cheetah3</pkg>
cherrypy	Enable support for using cherrypy.
genshi	Enable support for <pkg>dev-python/genshi</pkg>
gnupg	Enable support for gnupg via python-gnupg.
libcloud	Enable salt-cloud support via libcloud.
mako	Add support for using the mako template engine for parsing salt states.
neutron	Support the OpenStack neutron network service.
raet	Add support for the new RAET transport.

sudo

Flag	Description
secure-path	Replace PATH variable with compile time secure paths

sudo-rs

Flag	Description
system-names	Install as "sudo", "su" etc rather than sudo-rs

syslog-ng

Flag	Description
amqp	Enable support for AMQP destinations
pacct	Enable support for reading Process Accounting files (EXPERIMENTAL, Linux only)
spoof-source	Enable support for spoofed source addresses

sysstat

Flag	Description
dcron	Adjust cronjobs to work properly under <pkg>sys-process/dcron</pkg>

ulogd

Flag	Description
nfct	Build NFCT input plugin to support stateful flow-based logging via nfnetlink_conntrack

webalizer

Flag	Description
xtended	Include the 404 extension

xkcdpass

Flag	Description
l10n_no	Norwegian

app-alternatives

awk

Flag	Description
gawk	Symlink to <pkg>sys-apps/gawk</pkg>
mawk	Symlink to <pkg>sys-apps/mawk</pkg> (warning: mawk is not fully POSIX-compliant)
nawk	Symlink to <pkg>sys-apps/nawk</pkg>

bc

Flag	Description
gh	Symlink to bc-gh from <pkg>sci-calculators/bc-gh</pkg>

bzip2

Flag	Description
lbzip2	Symlink to <pkg>app-arch/lbzip2</pkg>.
pbzip2	Symlink to <pkg>app-arch/pbzip2</pkg>.

gpg

Flag	Description
freepg	Symlink to <pkg>app-crypt/freepg</pkg>.

gzip

Flag	Description
pigz	Symlink to <pkg>app-arch/pigz</pkg>.

lex

Flag	Description
flex	Symlink to <pkg>sys-devel/flex</pkg>.
reflex	Symlink to <pkg>sys-devel/reflex</pkg>.

lzip

Flag	Description
plzip	Symlink to <pkg>app-arch/plzip</pkg>.

ninja

Flag	Description
samurai	Symlink to dev-build/samurai.

sh

Flag	Description
ksh	Symlink to <pkg>app-shells/ksh</pkg>
mksh	Symlink to mksh from <pkg>app-shells/mksh</pkg>

yacc

Flag	Description
bison	Symlink to <pkg>app-alternatives/yacc</pkg>.
byacc	Symlink to <pkg>dev-util/byacc</pkg>.

app-antivirus

clamav

Flag	Description
clamapp	Build applications (clamscan, clamd, clamdscan, clamonacc (also has its own USE flag), sigtool, clambc, clamav-milter (also requires milter USE flag), clamdtop, clamsubmit, clamconf).
clamdtop	A Top like tool which shows what clamd is currently scanning amongst other things
clamonacc	Build the clamonacc on-access scanner
clamsubmit	A tool to submit false positives / negatives
libclamav-only	Bypass building of libfreshclam and the ClamAV CLI applications.
metadata-analysis-api	Enables collection of file property metadata using ClamAV API for analysis by ClamAV bytecode programs.
system-mspack	Use <pkg>dev-libs/libmspack</pkg> instead of the version bundled with ClamAV

clamtk

Flag	Description
nemo	Install the Nemo plugin.

app-arch

7zip

Flag	Description
jwasm	Use <pkg>dev-lang/jwasm</pkg> to include optimized code (doesn't support AES)
uasm	Use <pkg>dev-lang/uasm</pkg> to include optimized code

dpkg

Flag	Description
update-alternatives	Install update-alternatives

dump

Flag	Description
ermt	encrypted rmt support

libarchive

Flag	Description
blake2	Enable Blake2 hash support via <pkg>app-crypt/libb2</pkg>.

lrzip-next

Flag	Description
year2038	Enables support for 64-bit 'time_t' (sets D_TIME_BITS=64; glibc only)

rar

Flag	Description
all-sfx	Install all SFX (Self-Extracting) files rather than just the native format (allows creation of Windows EXEs on Linux ELF systems)

wimlib

Flag	Description
yasm	Use yasm assembler instead of nasm

xz-utils

Flag	Description
extra-filters	Build additional filters that are not used in any of the default xz presets. This includes delta and BCJ coders, additional match finders and SHA256 checks.

app-backup

bacula

Flag	Description
bacula-clientonly	Disable DB support, and just build a client
bacula-nodir	Disable building of director
bacula-nosd	Disable building of storage daemon
batch-insert	Enable batch insert into data base

bareos

Flag	Description
clientonly	Only install file-daemon (client)
director	Install director
scsi-crypto	Enable low level SCSI crypto support
storage-daemon	Install storage daemon (bareos-sd)

borgmatic

Flag	Description
apprise	Allow backup monitoring to send notification to a wide variety of services, using <pkg>dev-python/apprise</pkg>

btrbk

Flag	Description
lsbtr	Enable the lsbtr command-line tool
mbuffer	Use <pkg>sys-block/mbuffer</pkg> to enable progress bar and buffering/limiting functionality

dar

Flag	Description
dar32	Enables --enable-mode=32 option, which replace infinite by 32 bit integers
dar64	Enables --enable-mode=64 option, which replace infinite by 64 bit integers
whirlpool	Enables Whirlpool hashing support with <pkg>app-crypt/rhash</pkg>

tsm

Flag	Description
gpfs	Support the IBM General Parallel File System (GPFS)
journal	Support Journal based backups (JBB)

app-benchmarks

httperf

Flag	Description
idleconn	Build with the idleconn program

sysbench

Flag	Description
attachsql	Add support for AttachSQL.
drizzle	Add support for Drizzles.

app-cdr

brasero

Flag	Description
libburn	Enable <pkg>dev-libs/libburn</pkg> backend

cdemu

Flag	Description
cdemu-daemon	Pull <pkg>app-cdr/cdemu-daemon</pkg> dependency, useful in chroot environment (bug #315491). Do not disable until you know what you are doing.

app-containers

containerd

Flag	Description
cri	Support for Kubernetes CRI

crun

Flag	Description
criu	Enable CRIU based checkpoint/restore support

docker

Flag	Description
container-init	Makes the a staticly-linked init system tini available inside a container.
overlay2	Enables dependencies for the "overlay2" graph driver, including necessary kernel flags.

docker-credential-helpers

Flag	Description
pass	Build pass helper for the pass utility.

incus

Flag	Description
fuidshift	Install the fuidshift binary - currently conflicts with app-containers/lxd

snapd

Flag	Description
forced-devmode	Automatically disable application confinement if feature detection fails.

app-crypt

ccid

Flag	Description
twinserial	Enable twinserial reader

certbot

Flag	Description
certbot-
certbot-apache	Enable Apache plugin.
certbot-dns-dnsimple	Enable DNSimple Authenticator plugin.
certbot-dns-dnsmadeeasy	Enable DNS Made Easy DNS Authenticator plugin.
certbot-dns-gehirn	Enable Gehirn Infrastructure Service DNS Authenticator plugin.
certbot-dns-google	Enable Google Cloud DNS Authenticator plugin.
certbot-dns-linode	Enable Linode DNS Authenticator plugin plugin.
certbot-dns-luadns	Enable LuaDNS Authenticator plugin.
certbot-dns-nsone	Enable NS1 DNS Authenticator plugin.
certbot-dns-ovh	Enable OVH DNS Authenticator plugin.
certbot-dns-rfc2136	Enable RFC 2136 DNS Authenticator plugin.
certbot-dns-route53	Enable Route53 DNS Authenticator plugin.
certbot-dns-sakuracloud	Enable Sakura Cloud DNS Authenticator plugin.
certbot-nginx	Enable Nginx plugin.

eid-mw

Flag	Description
p11-kit	Support for <pkg>app-crypt/p11-kit</pkg>.

gnupg

Flag	Description
alternatives	Install renamed, for compatibility with <pkg>app-alternatives/gpg</pkg>.

hashcat

Flag	Description
brain	Enable the hashcat brain

heimdal

Flag	Description
hdb-ldap	Adds support for LDAP as a database backend

johntheripper-jumbo

Flag	Description
cpu_flags_x86_avx512bw	Use AVX-512 byte- and word instructions

libb2

Flag	Description
native-cflags	Use CFLAGS as determined by configure script. These flags will enable all CPU specific features it find available, to further optimise the implementation. This discards any existing CFLAGS set in make.conf or similar.

mit-krb5

Flag	Description
pkinit	Enable pkinit support for the initial ticket

onak

Flag	Description
hkp	Proxying backend support

ophcrack

Flag	Description
tables	Require the additional tables used to carry out cracking (<pkg>app-crypt/ophcrack-tables</pkg>)

ophcrack-tables

Flag	Description
vistafree	Installs the free Vista ophcrack tables
xpfast	Installs the fast XP ophcrack tables
xpsmall	Installs the small free XP ophcrack tables

qca

Flag	Description
softstore	Enable softstore plugin

tpm2-tss

Flag	Description
policy	Enable policy library (requires openssl as crypto backend)

uacme

Flag	Description
ualpn	Build uapln - lightweight proxying ACMEv2 tls-alpn-01 responder

app-dicts

myspell-de

Flag	Description
"de-AT"
"de-CH"
"de-DE"

myspell-en

Flag	Description
"en-ZA"

myspell-large-en

Flag	Description
"en"

myspell-pt

Flag	Description
preao	Use the pre ortographic agreement version of the dictionary

app-doc

devmanual

Flag	Description
offline	Use alternative minimal stylesheet instead of Tyrian theme

kicad-doc

Flag	Description
l10n_id	Indonesian

php-docs

Flag	Description
${IUSE/+l10n_en/+l10n_en}

pms

Flag	Description
twoside	Enable two-sided layout suitable for printing

app-editors

bluefish

Flag	Description
gucharmap	Enable gucharmap dictionary plugin

emacs

Flag	Description
gfile	Use gfile (<pkg>dev-libs/glib</pkg>) for file notification
mailutils	Retrieve e-mail using <pkg>net-mail/mailutils</pkg> instead of the internal movemail substitute
toolkit-scroll-bars	Use the selected toolkit's scrollbars in preference to Emacs' own scrollbars
wide-int	Prefer wide Emacs integers (typically 62-bit). This option has an effect only on 32-bit systems, where it increases the maximum buffer size from 0.5 to 2 GiB, at the cost of 10% to 30% Lisp slowdown.
xwidgets	Enable use of GTK widgets in Emacs buffers (requires GTK3)

enter-tex

Flag	Description
latexmk	Install <pkg>dev-tex/latexmk</pkg> (used by default for the build tools)

gedit-plugins

Flag	Description
charmap	Insert special characters just by clicking on them

gvim

Flag	Description
netbeans	Include netbeans external editor integration support

jasspa-microemacs

Flag	Description
nanoemacs	Build NanoEmacs instead of MicroEmacs

joe

Flag	Description
xterm	Enable full xterm clipboard support

nano

Flag	Description
justify	Enable justify/unjustify functions for text formatting.

neovim

Flag	Description
nvimpager	Install nvimpager symlink to less.sh macro

vim

Flag	Description
vim-pager	Install vimpager and vimmanpager links

xemacs

Flag	Description
bignum	Support for OpenSSL bignum implementation

app-emacs

auctex

Flag	Description
preview-latex	Use bundled preview-latex

bbdb

Flag	Description
tex	Install plain TeX support files
vm	Add support for <pkg>app-emacs/vm</pkg>

calfw

Flag	Description
howm	Add support for the <pkg>app-emacs/howm</pkg> note-taking tool

flim

Flag	Description
oauth2	Support OAuth2 authentication (<pkg>app-emacs/oauth2</pkg>)

gap-mode

Flag	Description
completion	Install GAP backend for <pkg>app-emacs/company-mode</pkg> to "complete anything."
lint	Support automatically linting GAP code via <pkg>app-emacs/flycheck</pkg> and <pkg>dev-gap/gaplint</pkg>.

org-mode

Flag	Description
odt-schema	Install non-free schema files for OpenDocument Text exporter

remember

Flag	Description
planner	Include support for <pkg>app-emacs/planner</pkg>

wikipedia-mode

Flag	Description
outline-magic	Enable support for outline-mode extensions (<pkg>app-emacs/outline-magic</pkg>)

app-emulation

86Box

Flag	Description
munt	Enable MIDI MT-32 support through <pkg>media-libs/munt-mt32emu</pkg>.

aranym

Flag	Description
pmmu	Build full PMMU variant, required for running mainline Linux
standard	Build standard (no JIT or PMMU) variant

bochs

Flag	Description
3dnow	Enable support for emulating 3DNow! instructions (incomplete)
x86-64	Enable support for emulation of 64-bit CPUs

dxvk

Flag	Description
d3d10	Enable support for DirectX 10 (d3d10.dll)
d3d11	Enable support for DirectX 11 (d3d11.dll)
d3d8	Enable support for DirectX 8 (d3d8.dll)
d3d9	Enable support for DirectX 9 (d3d9.dll)
dxgi	Enable support for the DirectX Graphics Infrastructure (dxgi.dll)

faudio

Flag	Description
dumpvoices	FAudio dumps buffer data to individual files with RIFF/XWMA headers, usable with players like ffplay/testxwma.

fs-uae

Flag	Description
fmv	Enable support for CD32 FMV (full motion video)
glew	Enable support for The OpenGL Extension Wrangler Library (<pkg>media-libs/glew</pkg>)

fs-uae-launcher

Flag	Description
lha	Enable LHA archive support

fuse

Flag	Description
backend-X	Use X11 rendering backend
backend-fbcon	Use framebuffer rendering backend
backend-gtk3	Use Gtk+ rendering backend
backend-sdl	Use SDL1 rendering backend
backend-sdl2	Use SDL2 rendering backend
memlimit	Add compile-time memory usage limiting

grub-xen-host

Flag	Description
pvh	Build an additional grub bin for pvh.

hercules-sdl

Flag	Description
object-rexx	Enable REXX support via Open Object Rexx (<pkg>dev-lang/oorexx</pkg>)
regina-rexx	Enable REXX support via Regina Rexx (<pkg>dev-lang/regina-rexx</pkg>)

libcacard

Flag	Description
passthrough	Enable smartcard passthrough support via <pkg>sys-apps/pcsc-lite</pkg>

libguestfs

Flag	Description
erlang	Build Erlang bindings

libvirt

Flag	Description
iscsi-direct	Allow using libiscsi for iSCSI storage pool backend
libvirtd	Builds the libvirtd daemon as well as the client utilities instead of just the client utilities
lxc	Support management of Linux Containers virtualisation (<pkg>app-containers/lxc</pkg>)
parted	Allow using real disk partitions as pool for disk image storage, using <pkg>sys-block/parted</pkg> to create, resize and delete them.
virt-network	Enable virtual networking (NAT) support for guests. Includes all the dependencies for NATed network mode. Effectively any network setup that relies on libvirt to setup and configure network interfaces on your host. This can include bridged and routed networks ONLY if you are allowing libvirt to create and manage the underlying devices for you. In some cases this requires enabling the 'netcf' USE flag (currently unavailable).
virtiofsd	Drag in virtiofsd dependency <pkg>app-emulation/virtiofsd</pkg>
virtualbox	Support management of VirtualBox virtualisation (<pkg>app-emulation/virtualbox</pkg>)
wireshark-plugins	Build the <pkg>net-analyzer/wireshark</pkg> plugin for the Libvirt RPC protocol

nemu

Flag	Description
network-map	Adds possibility of exporting network map to SVG
ovf	Adds support for OVA/OVF import
remote-api	Adds API for remote control

open-vm-tools

Flag	Description
deploypkg	Build deploypkg plugin
dnet	Enable support for nicinfo
gtkmm	Compile with Gtkmm and sigc++ (Recommended)
multimon	Enable multimon (Requires X)
resolutionkms	Build the linux/unix resolutionkms module
vgauth	Build vgauth

q4wine

Flag	Description
wineappdb	Enable Wine AppDB browser support

qemu

Flag	Description
fdt	Enables firmware device tree support
multipath	Enable multipath persistent reservation passthrough via <pkg>sys-fs/multipath-tools</pkg>.
passt	Enable TCP/IP in hypervisor via <pkg>net-misc/passt</pkg>
pin-upstream-blobs	Pin the versions of BIOS firmware to the version included in the upstream release. This is needed to sanely support migration/suspend/resume/snapshotting/etc... of instances. When the blobs are different, random corruption/bugs/crashes/etc... may be observed.
sdl-image	SDL Image support for icons
static-user	Build the User targets as static binaries
vhost-net	Enable accelerated networking using vhost-net, see https://www.linux-kvm.org/page/VhostNet
virgl	Enable experimental Virgil 3d (virtual software GPU)
virtfs	Enable VirtFS via virtio-9p-pci / fsdev. See https://wiki.qemu.org/Documentation/9psetup

virt-what

Flag	Description
dmi	Use <pkg>sys-apps/dmidecode</pkg> to read firmware data

xe-guest-utilities

Flag	Description
xenstore	Use xenstore binaries bundled by Citrix instead of building <pkg>app-emulation/xen-tools</pkg>

xen

Flag	Description
boot-symlinks	Symlink xen.gz variants in /boot, disable on fat filesystems
flask	Enable the Flask XSM module from NSA

xen-tools

Flag	Description
hvm	Enable support for hardware based virtualization (VT-x,AMD-v)
ipxe	Enable ipxe support
ovmf	Enable support to boot UEFI guest vm, needed by hvm
pygrub	Install the pygrub boot loader
qemu-traditional	Build the old qemu traditional device model (useful only if you cannot change to the new device model e.g. Windows VMs)
rombios	Enable rombios support, needed by ipxe
system-ipxe	Using <pkg>sys-firmware/ipxe</pkg> instead of the bundled one
system-qemu	Using <pkg>app-emulation/qemu</pkg> instead of the bundled one
system-seabios	Using <pkg>sys-firmware/seabios</pkg> instead of the bundled one

xtrs

Flag	Description
ls-dos	Install LS-DOS disk images for Model 4P

app-forensics

aide

Flag	Description
e2fs	Enable support for checking file attributes on ext2/ext3/ext4 filesystems

sleuthkit

Flag	Description
aff	Enable extra aff formats
ewf	Enable libewf support

volatility3

Flag	Description
disasm	support plugins that perform malware analysis and disassemble code
jsonschema	improve error messages regarding improperly configured ISF files
leechcore	support memory acquisition via leechcore
yara	support YARA pattern matching engine

yara

Flag	Description
cuckoo	Enable cockoo module
dex	Enable dex module
dotnet	Enable dotnet module
macho	Enable macho module

app-i18n

enca

Flag	Description
recode	Enable support for the GNU recode library

fcitx

Flag	Description
presage	Enable presage for word predication (not stable)
system-yoga	Use the system-wide <pkg>dev-libs/yoga</pkg>instead of bundled.

fcitx-chinese-addons

Flag	Description
cloudpinyin	Build cloud pinyin addon

fcitx-configtool

Flag	Description
config-qt	Enable fcitx5-config-qt
kcm	Enable KDE KCM support

fcitx-gtk

Flag	Description
snooper	Enable key snooper for gtk app

fcitx-lua

Flag	Description
dlopen	Use dlopen to load lua library

fcitx-qt

Flag	Description
staticplugin	Build plugin as static

ibus-handwrite

Flag	Description
zinnia	Enable support for <pkg>app-i18n/zinnia</pkg>

imsettings

Flag	Description
xfconf	Enable support for <pkg>xfce-base/xfconf</pkg>

man-pages-l10n

Flag	Description
(cs
vi)

mozc

Flag	Description
fcitx5	Enable support for <pkg>app-i18n/fcitx</pkg> 5
renderer	Enable native candidate window

scim-anthy

Flag	Description
kasumi	Use Anthy dictionary maintenance tool (<pkg>app-dicts/kasumi</pkg>)

skk-jisyo

Flag	Description
ruby_targets_ruby34	Build with MRI Ruby 3.4.x

tomoe

Flag	Description
hyperestraier	Enable support for <pkg>app-text/hyperestraier</pkg>

uim

Flag	Description
eb	Enable support for <pkg>dev-libs/eb</pkg>

app-laptop

pbbuttonsd

Flag	Description
ibam	Enable support for Intelligent Battery Monitoring

thinkfan

Flag	Description
atasmart	include libatasmart support to get disc temperature

tp_smapi

Flag	Description
hdaps	Install a compatible HDAPS module

app-metrics

collectd

Flag	Description
collectd_plugins_
collectd_plugins_${plugin}

app-misc

FreeSSM

Flag	Description
small-resolution	Build the app for small resolution screeens

blink1

Flag	Description
mini-tool	Build and install command-line mini-tool blink1-mini-tool (normally used for embedded devices)
tool	Build and install command-line tool blink1-tool

ddcutil

Flag	Description
usb-monitor	Adds support for monitors attached via USB.
user-permissions	Adds a udev rules to allow non-root users in the i2c group to access the /dev/i2c-* devices. If usb-monitor is selected, users will need to be added to the video group to access the USB monitor. Otherwise, only root will be able to use ddcutil.

digitemp

Flag	Description
ds2490	Build support for the ds2490 sensor
ds9097	Build support for the ds9097 sensor
ds9097u	Build support for the ds9097u sensor

ebusd

Flag	Description
knx	Enable support for connecting to KNX.

fastfetch

Flag	Description
chafa	Enables text/graphics renderer with <pkg>media-gfx/chafa</pkg>

gramps

Flag	Description
geo	Enable rendering of geographical data using <pkg>sci-geosciences/osm-gps-map</pkg>

graphlcd-base

Flag	Description
lcd_devices_ax206dpf	Add support for AX206 DPF LCD modules
lcd_devices_picolcd_256x64	Add support for Mini-Box's picoLCD with a higher resolution
lcd_devices_vnc	Add support for output on a vnc connection

jdupes

Flag	Description
dedupe	Enable deduplication support

jp

Flag	Description
jpp	Install jpp which is an extended superset of the jp CLI for JMESPath

jpipe

Flag	Description
jp-symlink	Install a jp symlink that points to jpipe.
jpp-symlink	Install a jpp symlink that points to jpipe.

kryoflux-dtc

Flag	Description
fast-firmware	Install fast firmware instead of slow firmware.

lcd4linux

Flag	Description
button-exec	Enable the Button plugin, to execute something on keypress.
cpuinfo	Enable the cpuinfo plugin.
diskstats	Enable the diskstats plugin.
huawei	Enable the huawei plugin, to read from a huawei device.
i2c-sensors	Enable the i2c_sensors plugin, to read sensor data.
isdn	Enable the isdn plugin, to get information about ISDN.
kvv	Enable the kvv plugin, to get realtime train schedule from the Karlsruher Verkehrsverbund.
lcd_devices_hd44780-i2c	Enable hd44780 via i2c instead of parallel port driver
loadavg	Enable the loadavg plugin, to get stats load
meminfo	Enable the meminfo plugin, to get memory statistics.
mpris-dbus	Enable the mpris plugin, to read data via dbus for mpris.
netdev	Enable the netdev plugin, to get interface statistics.
netinfo	Enable the netinfo plugin, to get more interface statistic.
outb	Enable raw i/o access.
proc-stat	Enable the proc_stat plugin, to read data from the proc file system.
qnaplog	Enable the qnaplog plugin, to read a log from a QNAP device.
raspi	Enable the raspi plugin, to read sensor data from a Raspberry Pi.
statfs	Enable the statfs plugin, to get statistics about the file system.
uname	Enable the uname plugin, to get the output of uname.
uptime	Enable the uptime plugin.
w1retap	Enable the w1retap plugin.
wireless	Enable the wireless plugin, to get wireless statistics.

lcdproc

Flag	Description
${IUSE/+lcd_devices_glcd/+lcd_devices_glcd}
ethlcd	Enable support for ethlcd in the hd44780 driver.
extra-charmaps	Enable extra language specific charmaps.
lcd_devices_glcd	Add support for various graphical LCDs, like GLCD2USB
menu	Enable menu support in the lcdproc client.
test-menu	Enable test menu support for the lcdproc server.

lirc

Flag	Description
devinput	Support the devinput input device
inputlirc	Add a dependency on <pkg>app-misc/inputlircd</pkg>

localsearch

Flag	Description
iptc	Enable extraction of IPTC data from pictures

mc

Flag	Description
edit	Compile and install the mcedit application

mosquitto

Flag	Description
bridge	Enable bridge support in the MQTT broker.
persistence	Store messages and subscriptions to a file.
srv	Include SRV lookup support.

nnn

Flag	Description
8contexts	Enable 8 contexts (instead of 4)
colemak	Key bindings for Colemak keyboard layout
gitstatus	Add git status column to the detail view
namefirst	Print filenames first in the detail view
nerdfonts	Display icons using nerdfonts icons
qsort	Use Alexey Tourbin's quick sort implementation
restorepreview	Add pipe to close and restore preview-tui for internal undetached edits

note

Flag	Description
dbm	Add support for generic DBM databases
general	Add support for ascii flatfile backend

ola

Flag	Description
rdm-tests	Install RDM responder tests

recoll

Flag	Description
camelcase	Enable indexing for camelCase sentences and words
semantic	Enable the semantic search functions

screen

Flag	Description
nethack	Express error messages in nethack style

sphinx

Flag	Description
id64	use 64-bit document and word IDs

tinysparql

Flag	Description
localsearch	Install the <pkg>app-misc/localsearch</pkg> package for actual data mining support for tinysparql

vcontrold

Flag	Description
vclient	Build the vclient helper program to talk to vcontrold
vsim	Build the vsim helper program (simulates the heating's answers, for development and debugging)

vifm

Flag	Description
extended-keys	Support for extended keys (arrows, home etc)

worker

Flag	Description
avfs	Enable support for <pkg>sys-fs/avfs</pkg>

app-office

abiword

Flag	Description
collab	Enable collaborative editing plugin
redland	Enables support redland and raptor libs.
thesaurus	Enable thesaurus support
wordperfect	Enable wordperfect file support via <pkg>app-text/libwpd</pkg>

auto-multiple-choice

Flag	Description
l10n_${lala}

calcurse

Flag	Description
caldav	Support CalDAV

calligra

Flag	Description
${CAL_FTS[@]})
'calligra_features_%s
import-filter	Enable support for various import filter file formats like WordPerfect, Visio and Apple Keynote
okular	Enable bindings for <pkg>kde-apps/okular</pkg>

gnucash

Flag	Description
aqbanking	Connect to some internet banks via AqBanking
quotes	Enable online stock quote retrieval

kmymoney

Flag	Description
hbci	Enable HBCI support using <pkg>net-libs/aqbanking</pkg>

libreoffice

Flag	Description
${LO_EXTS})
'libreoffice_extensions_%s
coinmp	Use <pkg>sci-libs/coinor-mp</pkg> as alternative solver
googledrive	Enable support for remote files on Google Drive
odk	Build the Office Development Kit
pdfimport	Enable PDF import via the Poppler library

lyx

Flag	Description
monolithic-build	This should speed up compilation significantly when you have enough RAM (> 600 MB)
rtf	Add support for RTF import/export packages

sc-im

Flag	Description
plots	Add <pkg>sci-visualization/gnuplot</pkg> for plotting support
tmux	Use <pkg>app-misc/tmux</pkg> for clipboard copy/paste

scribus

Flag	Description
osg	3D rendering via <pkg>dev-games/openscenegraph</pkg>

texstudio

Flag	Description
qtermwidget	Enable terminal pane using <pkg>x11-libs/qtermwidget</pkg>

app-pda

gtkpod

Flag	Description
clutter	Enable clutter support for displaying coverart

app-portage

conf-update

Flag	Description
colordiff	Use colors when displaying diffs (<pkg>app-misc/colordiff</pkg>)

elogv

Flag	Description
"de"
"es"
"it"
"pl"

gemato

Flag	Description
pretty-log	Pull <pkg>dev-python/rich</pkg> to enable pretty logs

kuroneko

Flag	Description
scraper	Include the dependencies necessary for Bugzilla scraping.

nattka

Flag	Description
depgraph-order	Process packages in depgraph order whenever possible.

portage-utils

Flag	Description
gpkg	Build GLEP-78 gpkg support in qpkg
gtree	Build gtree repository cache support
qmanifest	Build qmanifest applet, this adds additional dependencies for GPG, OpenSSL and BLAKE2B hashing

app-shells

bash

Flag	Description
bashlogger	Log ALL commands typed into bash; should ONLY be used in restricted environments such as honeypots
mem-scramble	Build with custom malloc/free overwriting allocated/freed memory

bash-completion

Flag	Description
eselect	Support blacklisting of completions via 'eselect bashcomp'. This enables custom Gentoo patching of upstream completion loader.

nushell

Flag	Description
mcp	Build MCP server
system-clipboard	System clipboard support in `reedline`

app-text

blogc

Flag	Description
make	Build blogc-make tool

calibre

Flag	Description
font-subsetting	Enable font subsetting support
unrar	Enable support for comic books compressed with the non-free Rar format

crm114

Flag	Description
mew	Add support for using the mewdecode mime decoder (<pkg>app-emacs/mew</pkg>)
normalizemime	Add support for using the normalizemime (<pkg>mail-filter/normalizemime</pkg>)

dblatex

Flag	Description
inkscape	Use inkscape to convert SVG. Disable to use <pkg>gnome-base/librsvg</pkg> instead.

docbook-sgml-utils

Flag	Description
jadetex	Add support for processing tex files produced by the TeX backend of Jade

doxygen

Flag	Description
doxysearch	build doxyindexer and doxysearch.cgi

ebook-tools

Flag	Description
lit2epub	Install lit2epub script

enchant

Flag	Description
nuspell	Adds support for <pkg>app-text/nuspell</pkg> spell checker
voikko	Adds support for <pkg>dev-libs/libvoikko</pkg> spell checker

groonga

Flag	Description
apache-arrow	Enable support for Apache Arrow
cpu_flags_x86_{avx,avx2,avx512dq}
exact-alloc-count	Atomic counting for memory alloc count
futex	Use futex
nfkc	Use nfkc based utf8 normalization
suggest-learner	Build groonga-suggest-learner to learn suggest result from groonga-suggest-httpd or query logs
uyield	Build for detecting race conditions

lcdf-typetools

Flag	Description
kpathsea	Enable integration with kpathsea search library (TeX related)

mandoc

Flag	Description
system-man	set as the default man provider

msort

Flag	Description
heap	Use heap instead of alloca()
libuninum	Use <pkg>dev-libs/libuninum</pkg> for conversion.

pandoc

Flag	Description
trypandoc	Build trypandoc cgi executable.

pandoc-bin

Flag	Description
pandoc-symlink	Install pandoc symlink that points to pandoc-bin

papers

Flag	Description
comics	Enable comics support

pdfgrep

Flag	Description
unac	Removing accents and ligatures before search

qpdf

Flag	Description
zopfli	Support using <pkg>app-arch/zopfli</pkg> for stronger zlib-compatible compression.

qpdfview

Flag	Description
fitz	Use experimental fitz rendering, provided by <pkg>app-text/mupdf</pkg>, instead of poppler

sdcv

Flag	Description
darkterm	Improve readability of color output on terminals with dark background.

sword

Flag	Description
clucene	Use <pkg>dev-cpp/clucene</pkg> for lucene search support

tesseract

Flag	Description
float32	Support float for model training and text recognition (faster, requires less RAM)
training	Install training applications to add support for new languages.

texlive

Flag	Description
humanities	Add LaTeX support for the humanities (<pkg>dev-texlive/texlive-humanities</pkg>)
luatex	Install TeX Live packages that require luatex
pdfannotextractor	Add <pkg>dev-tex/pdfannotextractor</pkg> support, for extracting annotations from PDF files
pstricks	Add pstricks packages (<pkg>dev-texlive/texlive-pstricks</pkg>)
publishers	Add support for publishers (<pkg>dev-texlive/texlive-publishers</pkg>)
science	Add typesetting support for natural and computer sciences (<pkg>dev-texlive/texlive-mathscience</pkg>)
tex4ht	Add support for <pkg>dev-tex/tex4ht</pkg> (for converting (La)TeX to (X)HTML, XML and OO.org)
texi2html	Add support for <pkg>app-text/texi2html</pkg> which converts texi files to HTML

texlive-core

Flag	Description
xindy	Add support for Xindy: A general-purpose index processor.

webgen

Flag	Description
builder	Enable programmatic HTML/XML generation

writerperfect

Flag	Description
abiword	Add support for abiword format using <pkg>app-text/libabw</pkg>
ebook	Add support for various ebook formats using <pkg>app-text/libebook</pkg>
freehand	Add support for freehand format using <pkg>media-libs/libfreehand</pkg>
keynote	Add support for keynote format using <pkg>app-text/libetonyek</pkg>
mspub	Add support to mspub format using <pkg>app-text/libmspub</pkg>
mwaw	Add support to mwaw formats using <pkg>app-text/libmwaw</pkg>
pagemaker	Add support to pagemaker formats using <pkg>media-libs/libpagemaker</pkg>
qxp	Add support for QuarkXpress documents using <pkg>app-text/libqxp</pkg>
wpd	Add support for wpd format using <pkg>app-text/libwpd</pkg>
zmf	Add support for Zoner Callisto/Draw documents format using <pkg>media-libs/libzmf</pkg>

xpdf

Flag	Description
cmyk	Include support for CMYK rasterization
i18n	Enable support non-UTF8 national charsets
libpaper	Use <pkg>app-text/libpaper</pkg> to get paper preferences
opi	Include support for OPI (Open Prepress Interface) comments
textselect	Allow text selection

zathura-meta

Flag	Description
cb	Install plug-in for ComicBook support

app-vim

gentoo-syntax

Flag	Description
ignore-glep31	Remove GLEP 31 (UTF-8 file encodings) settings

dev-ada

aws

Flag	Description
wsdl	Used to convert ada to wsdl

gnatcoll-db

Flag	Description
db2ada	Build gnatcoll_db2ada
gnatinspect	Build gnatinspect

dev-build

bazelisk

Flag	Description
bazel-symlink	Install bazel symlink that points to bazelisk

muon

Flag	Description
libpkgconf	Enable looking up packages via <pkg>dev-util/pkgconf</pkg>.

dev-cpp

abseil-cpp

Flag	Description
test-helpers	Build libraries that you can use to write tests against Abseil code.

aws-sdk-cpp

Flag	Description
${!AWS_GROUPS[*]}
analytics	Adds access to big data and analysis related services.
database	Adds access functionality to RDB, NoSQL, TimeStream, and Ledger related services.
devops	Adds access to CI/CD and developer related services.
iot	Adds access to IoT and edge services.
management	Adds access to operational management related services.
messaging	Adds access to messaging and notification services.
ml	Adds access to machine learning and AI related services.
storage	Adds access to services related to object, block, and file storage.
uncategorized	Add access to services that do not easily fit into existing groups.

eigen

Flag	Description
"adolc"
"boost"
"cholmod"
"fftw"
"klu"
"metis"
"opengl"
"openmp"
"pastix"
"pocketfft"
"sparsehash"
"spqr"
"superlu"
"umfpack"
altivec:ALTIVEC
avx2:AVX2
avx512dq:AVX512DQ
avx512f:AVX512
avx:AVX
f16c:FP16C
fma3:FMA
mathjax	Use MathJax for rendering math in HTML docs (dev-libs/mathjax)
neon
neon:NEON
pastix	Add test support for PaStiX (<pkg>sci-libs/pastix</pkg>)
pocketfft	Add test support for pocketfft (<pkg>dev-libs/pocketfft</pkg>)
popcnt:POPCNT
sse2:SSE2
sse3:SSE3
sse4_1:SSE4_1
sse4_2:SSE4_2
sse:SSE
ssse3:SSSE3
vsx:VSX

glaze

Flag	Description
fuzzing	Build fuzzers (not install)

glog

Flag	Description
libunwind	Use libunwind library (<pkg>sys-libs/libunwind</pkg> or <pkg>llvm-runtimes/libunwind</pkg>) instead of built-in fallback implementation for stack unwinding

gtest

Flag	Description
abseil	Build with functionality provided by <pkg>dev-cpp/abseil-cpp</pkg> and <pkg>dev-libs/re2</pkg>

jwt-cpp

Flag	Description
jsoncons	Enable use of <pkg>dev-cpp/jsoncons</pkg>
picojson	Enable use of <pkg>dev-cpp/picojson</pkg>

libjson-rpc-cpp

Flag	Description
redis-client	Build support for Redis client using <pkg>dev-libs/hiredis</pkg>
redis-server	Build support for Redis server using <pkg>dev-libs/hiredis</pkg>
stubgen	Build header stub code generator (needed for development and when pregenerated headers are not bundled)

opentelemetry-cpp

Flag	Description
otlp	Build support for the OTLP (OpenTelemetry Protocol) File exporter

dev-db

mariadb

Flag	Description
aws-km	Add support for using the AWS Key Management plugin
columnstore	Build the ColumnStore storage engine
extraengine	Add support for alternative storage engines (Archive, CSV, Blackhole, Federated(X), Partition)
galera	Enables galera replication
innodb-lz4	Enables lz4 compression methods for InnoDB/XtraDB
innodb-lzo	Enables lzo compression methods for InnoDB/XtraDB
innodb-snappy	Enables snappy compression methods for InnoDB/XtraDB using <pkg>app-arch/snappy</pkg>
mroonga	Add support for the Mroonga engine for interfacing with the Groonga text search
oqgraph	Add support for the Open Query GRAPH engine
rocksdb	Add support for RocksDB; a key/value, LSM database optimized for flash storage
sst-mariabackup	Add tools needed to support the mariabackup SST method
sst-rsync	Add tools needed to support the rsync SST method
yassl	Enable SSL connections and crypto functions using the bundled yaSSL

mongodb

Flag	Description
mongosh	Install the MongoDB shell from <pkg>app-admin/mongosh-bin</pkg>

mysql

Flag	Description
router	Build the MySQL router program

oracle-instantclient

Flag	Description
precomp	"proc" binary and related files to precompile a Pro*C application
sqlplus	The SQL*Plus command line tool for SQL and PL/SQL queries

pgbouncer

Flag	Description
c-ares	Use c-ares as the DNS backend instead of evdns (libevent).

phpmyadmin

Flag	Description
setup	Installs the phpMyAdmin setup utility. Users who don't use the utility should disable this USE flag for security reasons as the setup tool was the target of various exploits in the past.

postgis

Flag	Description
address-standardizer	Normalize US and CA postal addresses
topology	Build topology spatial types and functions

spatialite

Flag	Description
rttopo	Add the <pkg>sci-geosciences/librttopo</pkg> library for topology support

sqldeveloper

Flag	Description
sybase	Add support for the Sybase SQL Database Server

sqlite

Flag	Description
secure-delete	Enable overwriting of deleted content with zeros by default (http://sqlite.org/pragma.html#pragma_secure_delete), causing some performance penalty

timescaledb

Flag	Description
proprietary-extensions	Enable proprietary features/extensions licensed under the TimeScale License

unixODBC

Flag	Description
odbcmanual	Administrator, Internal Structure, Programmer and User documentation

dev-debug

gdb

Flag	Description
sim	Build gdb's simulators for various hardware platforms. See https://sourceware.org/gdb/wiki/Sim.
source-highlight	Enable listing highlighting via <pkg>dev-util/source-highlight</pkg>

systemtap

Flag	Description
dtrace-symlink	Provide /usr/bin/dtrace symlink pointing to /usr/bin/stap-dtrace. This prevents coinstallation with <pkg>dev-debug/dtrace</pkg>.

dev-embedded

openocd

Flag	Description
cmsis-dap	Support for CMSIS-DAP compliant adapters
jlink	Build the SEGGER J-Link driver
verbose-io	Verbose IO and comm JTAG and USB messages

rpi-eeprom

Flag	Description
pi4	Install firmware files for the Raspberry Pi 4
pi5	Install firmware files for the Raspberry Pi 5

sdcc

Flag	Description
boehm-gc	Enable Hans Boehm's garbage collector <pkg>dev-libs/boehm-gc</pkg>
device-lib	Enable built of devices libraries
ds390	Add support for Dallas DS390
ds400	Add support for Dallas DS400
ez80-z80	Add support for EZ80-Z80
f8	Add support for the new F8 arch
hc08	Add support for Freescale/Motorola HC08 based
mcs51	Add support for Intel mcs51
mos6502	Add support for MOS 6502
mos65c02	Add support for MOS 65C02
packihx	Enable Intel HEX files pack utility
pdk13	Add support for PDK13
pdk14	Add support for PDK14
pdk15	Add support for PDK15
pdk16	Add support for PDK16
pic14	Add support for Microchip 14 bits PICs
pic16	Add support for Microchip 16 bits PICs
r2k	Add support for Rabbit 2000
r2ka	Add support for Rabbit 2000A
r3ka	Add support for Rabbit 3000A
r800	Add support for ASCII Corporation R800
s08	Add support for Freescale/Motorola S08
sdcdb	Enable SDCC source level debugger
sdcpp	Enable SDCC preprocessor based on GCC cpp
sm83	Add support for Gameboy SM83
stm8	Add support for STMicroelectronics STM8
tlcs90	Add support for TLCS-90
ucsim	Enable software simulator for microcontrollers
z180	Add support for Zilog Z180
z80	Add support for Zilog Z80
z80n	Add support for Zilog Z80N

u-boot-tools

Flag	Description
envtools	Build only the target-side environment tools

urjtag

Flag	Description
ftd2xx	Enable support for USB FTDI chips via <pkg>dev-embedded/libftd2xx</pkg>

dev-games

godot

Flag	Description
raycast	Enable the raycast Editor module using <pkg>media-libs/embree</pkg>

mygui

Flag	Description
ogre	Use the ogre render subsystem. (cannot combine with opengl)

ode

Flag	Description
gyroscopic	enable gyroscopic term (may cause instability)

ogre

Flag	Description
dotscene	DotScene (.scene) file format support through <pkg>dev-libs/pugixml</pkg>
gl3plus	Build OpenGL 3+ RenderSystem
glslang	Build Glslang plugin
tiny	Build Tiny RenderSystem (software-rendering)

physfs

Flag	Description
grp	Enable Build Engine GRP archive support
hog	Enable Descent I/II HOG archive support
mvl	Enable Descent I/II MVL archive support
qpak	Enable Quake I/II QPAK archive support
slb	Enable Independence War SLB archive support
vdf	Enable Gothic/Gothic II VDF archive support
wad	Enable Doom WAD archive support

dev-haskell

abstract-deque

Flag	Description
usecas	Enable the reference implementation to use hardware compare-and-swap.

aeson

Flag	Description
cffi	Controls whether to include c-ffi bits or pure haskell. Default to False for security.
ordered-keymap	Use ordered @Data.Map.Strict@ for KeyMap implementation.

aeson-pretty

Flag	Description
lib-only	don't build 'aeson-pretty' executable.

ansi-terminal

Flag	Description
example	Build the example application

bitvec

Flag	Description
simd	Use a C SIMD implementation for the ultimate performance of `zipBits`, `invertBits` and `countBits`. Disable this flag if there are problems with the C FFI.

c2hs

Flag	Description
regression	Enable regression suite build.

cabal-install

Flag	Description
native-dns	Enable use of the [resolv](https://hackage.haskell.org/package/resolv) & [windns](https://hackage.haskell.org/package/windns) packages for performing DNS lookups

chell

Flag	Description
color-output	use colors in program output

cmdargs

Flag	Description
quotation	Build the Quote module
testprog	Build the test program

comonad

Flag	Description
indexed-traversable	You can disable the use of the `indexed-traversable` package using `-f-indexed-traversable`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users. If disabled we will not supply instances of `FunctorWithIndex`

contravariant

Flag	Description
statevar	You can disable the use of the `StateVar` package using `-f-StateVar`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.

crypto-api

Flag	Description
all-cpolys	Build all the CMAC polynomes up to 10000 bits instead of just the usual ones

crypton

Flag	Description
check-alignment	extra check on alignment in C layers, which cause lowlevel assert errors. for debugging only.
old-toolchain-inliner	use -fgnu89-inline to workaround an old compiler / linker / glibc issue.
support-aesni	allow compilation with AESNI on system and architecture that supports it
support-deepseq	add deepseq instances for cryptographic types
support-pclmuldq	Allow compilation with pclmuldq on architecture that supports it
support-rdrand	allow compilation with RDRAND on system and architecture that supports it
support-sse	Use SSE optimized version of (BLAKE2, ARGON2)

dlist

Flag	Description
werror	Enable -Werror

doctest

Flag	Description
cabal-doctest	Install (experimental) cabal-doctest executable

entropy

Flag	Description
donotgetentropy	Avoid use of the getentropy() *nix function. By default getentropy will be used if detected during compilation (this plays poorly with cross compilation).
halvm	Build for the HaLVM.

glib

Flag	Description
closure-signals	Use the the GClosure-based signals 		implementation.

gtk2hs-buildtools

Flag	Description
closuresignals	Use the the GClosure-based signals implementation.

hashable

Flag	Description
random-initial-seed	Randomly initialize the seed on every executable invocation. This is not a security feature and is intended only for testing (it can affect legitimate use cases).

hashtables

Flag	Description
bounds-checking	if on, use bounds-checking array accesses
detailed-profiling	add detailed profiling information to profiled build-depends

hdbc-sqlite3

Flag	Description
splitbase	Choose the new smaller, split-up package.

http-api-data

Flag	Description
text-show	Use text-show library for efficient ToHttpApiData implementations.

httpd-shed

Flag	Description
buildexamples	Build example executables.

json

Flag	Description
mapdict	Encode Haskell maps as JSON dicts
pretty	Add support for using pretty printing combinators.

libyaml

Flag	Description
system-libyaml	Use the system-wide libyaml instead of the bundled copy

lpeg

Flag	Description
rely-on-shared-lpeg-library	Do not build lpeg from source, but trust that lpeg is made available in other ways, e.g., through a system-wide installation. The loader will be replaced with a placeholder function that only emits a message.

monad-par

Flag	Description
chaselev	Use Chase-Lev Deques for higher-perf work-stealing.

mwc-random

Flag	Description
benchpapi	Enable building of benchmarks which use instruction counters. It requires libpapi and only works on Linux so it's protected by flag

nats

Flag	Description
hashable	enable hashable instances

nothunks

Flag	Description
bytestring	Provide instances for bytestring

parsec-numbers

Flag	Description
parsec1	use <pkg>dev-haskell/parsec1</pkg> instead of <pkg>dev-haskell/parsec</pkg>

parsers

Flag	Description
attoparsec	You can disable the use of the `attoparsec` package using `-f-attoparsec`.

persistent-sqlite

Flag	Description
build-sanity-exe	Build a sanity check test executable

prettyprinter

Flag	Description
buildreadme	Build the readme generator

quickcheck-classes

Flag	Description
aeson	You can disable the use of the `aeson` package using `-f-aeson`. This may be useful for accelerating builds in sandboxes for expert users.
semirings	You can disable the use of the `semirings` package using `-f-semirings`. This may be useful for accelerating builds in sandboxes for expert users.

random-bytestring

Flag	Description
pcg	compile with support for PCG from pcg-random

rere

Flag	Description
cfg	CFG functionality, adds dependency on fin and vec
intersection	Add intersection constructor. EXPERIMENTAL

sandi

Flag	Description
conduit	Build with conduit

shelly

Flag	Description
lifted	run the tests against Shelly.Lifted

simple-sendfile

Flag	Description
allow-bsd	Allow use of BSD sendfile (disable on GNU/kFreeBSD)

skein

Flag	Description
force-endianness	Use a manually selected endian when compiling (see flag 'big-endian').

some

Flag	Description
newtype-unsafe	Use implementation using @newtype@ and unsafe @Any@, instead of GADT

splitmix

Flag	Description
optimised-mixer	Use JavaScript for mix32

string-interpolate

Flag	Description
bytestring-builder	Use ByteString Builders to construct ByteString outputs instead of the ByteString type itself. If you're regularly constructing large (>50KB) bytestrings, enabling this can speed up your code. Otherwise, enabling this is likely to be a net slowdown.
extended-benchmarks	Enable benchmarks for Interpolation and interpolatedstring-perl6
text-builder	Use Text Builders to construct Text outputs instead of the Text type itself. If you're regularly constructing large (>50KB) text objects, enabling this can speed up your code. Otherwise, enabling this is likely to be a net slowdown.

text

Flag	Description
simdutf	use simdutf library

transformers-base

Flag	Description
orphaninstances	Build instances for orphan datatypes.

unicode-collation

Flag	Description
doctests	Run doctests as part of test suite. Use with: @--write-ghc-environment-files=always@.

unix-compat

Flag	Description
old-time	build against old-time package

vec

Flag	Description
adjunctions	Depend on @adjunctions@ to provide its instances
distributive	Depend on @distributive@ to provide its instances. Turning on, disables @adjunctions@ too.

vector-algorithms

Flag	Description
bench	Build a benchmarking program to test vector-algorithms performance
properties	Enable the quickcheck tests

void

Flag	Description
safe	Disable effective but unsafe coercions

wai-app-static

Flag	Description
crypton	Use the crypton library for MD5 computation
print	print debug info

warp

Flag	Description
allow-sendfilefd	Allow use of sendfileFd (not available on GNU/kFreeBSD)
x509	Adds a dependency on the x509 library to enable getting TLS client certificates.

yesod-form

Flag	Description
network-uri	Get Network.URI from the network-uri package

zlib

Flag	Description
bundled-c-zlib	Use the bundled zlib C sources. Requires pkg-config to be False. For windows, this is the default.
non-blocking-ffi	The (de)compression calls can sometimes take a long time, which prevents other Haskell threads running. Enabling this flag avoids this unfairness, but with greater overall cost.

dev-java

ant

Flag	Description
antlr	Enable ANTLR Ant tasks
bcel	Enable bcel (bytecode manipulation) Ant tasks
bsf	Enable support for Apache Bean Scripting Framework (<pkg>dev-java/bsf</pkg>)
commonslogging	Enable commons-logging Ant tasks
commonsnet	Enable commons-net Ant tasks
imageio	Enable imageio Ant tasks
jai	Enable JAI (Java Imaging) Ant task
jakartamail	Enable Jakartamail Ant task
javamail	Enable JavaMail Ant task
jdepend	Enable Jdepend Ant tasks
jmf	Enable JMF (Java Media Framework) Ant tasks
jsch	Disable Jsch (ssh, scp and related) Ant tasks
junit	Enable JUnit Ant tasks
junit4	Enable JUnit4 Ant tasks
junitlauncher	Enable JUnit5 Ant tasks
oro	Enable Apache Oro Ant tasks
regexp	Enable Apache Regexp Ant tasks
resolver	Enable Apache Resolver Ant tasks
testutil	Enable optional test util classes
xalan	Enable Apache Xalan2 Ant tasks
xz	Enable XZ Ant tasks

dom4j

Flag	Description
jaxen	Includes org.jaxen.dom4j package

jaxen

Flag	Description
dom4j	Includes org.jaxen.dom4j package
jdom	Includes org.jaxen.jdom package
xom	Includes org.jaxen.xom package

junit

Flag	Description
migration-support	Include the junit-jupiter-migrationsupport module, which helps with migration from JUnit 4 to JUnit Jupiter
suite	Include the JUnit Platform Suite Engine, which adds test suite support
vintage	Include JUnit Vintage, which allows JUnit 5 to run JUnit 3 and JUnit 4 tests

openjdk

Flag	Description
javafx	Import OpenJFX modules at build time, via <pkg>dev-java/openjfx</pkg>
jbootstrap	Build OpenJDK twice, the second time using the result of the first
ppc64
x86

protobuf-java

Flag	Description
system-protoc	Use protoc provided by dev-libs/protobuf

dev-lang

ammonite-repl-bin

Flag	Description
scala2-13	Install Ammonite for Scala 2.13
scala3-0	Install Ammonite for Scala 3.0
scala3-1	Install Ammonite for Scala 3.1
scala3-2	Install Ammonite for Scala 3.2
scala3-3	Install Ammonite for Scala 3.3
scala3-5	Install Ammonite for Scala 3.5

erlang

Flag	Description
kpoll	Enable kernel polling support

gdl

Flag	Description
gshhs	Add support for projection adn continent maps with <pkg>sci-geosciences/gshhs-data</pkg>
shapelib	Add support for manipulating ESRI Shapefiles with <pkg>sci-libs/shapelib</pkg>

gforth

Flag	Description
check	Enable build-time sanity check.

ghc

Flag	Description
ghcbootstrap	Internal: Bootstrap GHC from an existing GHC installation.
ghcmakebinary	Internal: Build binary friendly for redistribution.
unregisterised	Create an unregisterised build in which only the C codegen backend will be available.

logtalk

Flag	Description
fop	Support for generating pdf documentation using fop

luajit

Flag	Description
lua52compat	Enable some upwards-compatible features from Lua 5.2 that are unlikely to break existing code.

mercury

Flag	Description
trail	Support Mercury trail grades

mercury-extras

Flag	Description
tommath	Enable support for tommath library

mlton

Flag	Description
bootstrap-smlnj	Boostrap mlton with <pkg>dev-lang/smlnj</pkg> (takes a long time)
stage3	After bootstrap building mlton with <pkg>dev-lang/smlnj</pkg>, rebuild mlton with the second stage build of mlton (recommended).

nim

Flag	Description
test-js	Enable tests that require Node.js

ocaml

Flag	Description
flambda	Enables the Flambda optimizer: A new intermediate representation (introduced in ocaml 4.03) in the depths of the compiler designed to allow for better inlining.

perl

Flag	Description
perl_features_debug	PERL_FEATURES setting enabling internal debug support in Perl
perl_features_quadmath	PERL_FEATURES setting enabling 128bit floating point arithmetic via libquadmath

php

Flag	Description
bcmath	Enable the BCMath Arbitrary Precision Mathematics extension
ctype	Enable the Character type checking (ctype) extension
e
embed	Enable embed SAPI
inifile	Add dbm support for .ini files
intl	Enables the intl extension for extended internalization support
ldap-sasl	Add SASL support for the PHP LDAP extension using <pkg>dev-libs/cyrus-sasl</pkg>
oci8-instant-client	Use dev-db/oracle-instantclient-basic as Oracle provider instead of requiring a full Oracle server install
opcache	Enables built-in opcode cache, replacing pecl-apc et al.
opcache-jit	Enable Just In Time (JIT) compilation within the opcache extension
pcntl	Enable the Process Control extension
pdo	Enable the PHP Data Objects extension
phar	Enables the phar extension to provide phar archive support
phpdbg	Enable the PHP Debug Command Line SAPI (like gdb for php)
session-mm	Include <pkg>dev-libs/mm</pkg> support for session storage
sharedmem	Enable the shmop extension
simplexml	Enable the SimpleXML extension
soap	Add support for SOAP (Simple Object Access Protocol)
sysvipc	Enable the PHP System-V semaphore, shared memory and IPC extension
tidy	Add support for HTML Tidy
tokenizer	Add support for the PHP file parser
val
xmlreader	Enable the XMLReader extension
xmlwriter	Enable the XMLWriter extension

polyml

Flag	Description
portable	Build the portable interpreter version of Poly/ML instead of native

pypy

Flag	Description
full-stdlib	Install complete stdlib as necessary to use PyPy for general purpose programs. By default, only a limited subset that is used when building PyPy3 executables is installed. Note that PyPy2.7's stdlib contains multiple known vulnerabilities.

python

Flag	Description
tail-call-interp	Enable the tail call interpreter. May lead to better performance but is still new and dependent on latest toolchain versions (Clang 19, GCC 15).
wininst	Install Windows executables required to create an executable installer for MS Windows

qu-prolog

Flag	Description
pedro	Pedro subscription/notification communications system

rust

Flag	Description
"${ALL_LLVM_TARGETS[@]/llvm_targets_/llvm_targets_}"
"${ALL_RUST_SYSROOTS[@]/rust_sysroots_/rust_sysroots_}"
dist	Install dist tarballs (used for bootstrapping)
llvm_targets_WebAssembly	WebAssembly backend
miri	Install miri, an interpreter for Rust's mid-level intermediate representation (requires USE=nightly, sometimes is broken)
mrustc-bootstrap	Use <pkg>dev-lang/mrustc</pkg> to build the bootstrap Rust sysroot from this package's source
parallel-compiler	Build a multi-threaded rustc (experimental, not tested by upstream)
system-llvm	Use the system LLVM installation
wasm	Build support for the wasm32-unknown-unknown target

swig

Flag	Description
ccache	build ccache-swig(a fast compiler cache)

vala

Flag	Description
valadoc	Installs valadoc documentation generation tool

dev-libs

apache-arrow

Flag	Description
dataset	Build the Arrow Dataset Modules

appstream

Flag	Description
apt	Enables Debians APT support
compose	Enable appstream compose

boehm-gc

Flag	Description
large	optimize for large heap size (also increases max root sets)

check

Flag	Description
subunit	Enable support for the subunit unit test protocol

cutlass

Flag	Description
cublas	Enable cuBLAS usage for tests

cyrus-sasl

Flag	Description
authdaemond	Add Courier-IMAP authdaemond unix socket support (<pkg>net-mail/courier-imap</pkg>, <pkg>mail-mta/courier</pkg>)
ldapdb	Enable ldapdb plugin
srp	Enable SRP authentication

date

Flag	Description
only-c-locale	Build only the C locale

dbus-c++

Flag	Description
ecore	Use Ecore integration

dynolog

Flag	Description
perf-events	Add performance events

efl

Flag	Description
dds	Enable DDS image loader
eet	Enable Eet image loader
efl-one	Combine multiple core libraries into one libefl.so
hyphen	Enable text hyphenation support
physics	Enable Bullet physics effects and support
pmaps	Enable PMAPS image loader
system-lz4	Use system liblz4 instead of bundled one
tgv	Enable Tgv image loader

gf2x

Flag	Description
fft	Build an FFT API for multiplication of 2 polynomials over GF(2)

glib

Flag	Description
mime	Pull in shared MIME database that many glib-based applications require at runtime to detect or open files. Warning: do not disable this flag unless installing on a headless server.

gobject-introspection

Flag	Description
doctool	Install g-ir-doc-tool for generating documentation from introspected data

hiredict

Flag	Description
shim	Install header shims for the hiredis api.

input-pad

Flag	Description
eekboard	Enable support for <pkg>dev-libs/eekboard</pkg>

intel-compute-runtime

Flag	Description
disable-mitigations	This will disable spectre mitigation, which can speed up the performance.

jemalloc

Flag	Description
lazy-lock	Enable lazy locking (only lock when multi-threaded)
prof	Enable allocation profiling
xmalloc	Add support for xmalloc (abort-on-out-of-memory)

libcec

Flag	Description
exynos	Enable support for Exynos chipsets
kernel-cec	Enable support for Linux kernel CEC framework

libdex

Flag	Description
liburing	Allow use of liburing (io_uring)<pkg>sys-libs/liburing</pkg>

libdwarf

Flag	Description
dwarfexample	enable dwarfexample compilation
dwarfgen	enable dwarfgen compilation

libevent

Flag	Description
clock-gettime	Disable use of clock_gettime even if it is available
malloc-replacement	Support for replacing the memory management functions

libffi

Flag	Description
exec-static-trampoline	Don't rely on dynamic code generation for trampolines.

libgcrypt

Flag	Description
cpu_flags_arm_sve	Use the Scalable Vector Extension instruction set
getentropy	Use getentropy function to obtain randomness from the kernel

libisoburn

Flag	Description
external-filters-setuid	Also allow the use of external setuid processes as file content filters (Note: this is a potential security risk)
frontend-optional	Use <pkg>dev-tcltk/bwidget</pkg> which is not strictly required for the frontend
launch-frontend	Enable the tcl gui for xorriso
launch-frontend-setuid	Enable the tcl gui for xorriso under setuid

libisofs

Flag	Description
lfa-flags	Enable processing of Linux chattr(1) flags
projid	Enable processing of XFS-style project id

liblogging

Flag	Description
stdlog	Enables liblogging's core component (think of it as a the next version of the syslog(3) API).

libmemcached

Flag	Description
hsieh	Use Hsieh hash algorithm.

liborcus

Flag	Description
spreadsheet-model	Enable the spreadsheet model implementation

libsecp256k1

Flag	Description
amd64
arm
ecdh	Enable ECDH shared secret computation
ellswift	Enable ElligatorSwift encoding for public keys
extrakeys	Enable extrakeys module
musig	Enable MuSig2 module
recovery	Enable ECDSA pubkey recovery module
schnorr	Enable Schnorr signature module

libsodium

Flag	Description
cpu_flags_x86_{aes,sse4_1}

libtomcrypt

Flag	Description
libtommath	Uses <pkg>dev-libs/libtommath</pkg> for mathematical operations
tomsfastmath	Uses <pkg>dev-libs/tomsfastmath</pkg> for mathematical operations

libucl

Flag	Description
sign	Enable signatures check
urls	Enable URLs fetch

libvoikko

Flag	Description
expvfst	Enable experimental features of VFST morphology backend
hfst	Enable HFST morphology backend

log4cplus

Flag	Description
explicit-initialization	Require explicit initialization

m17n-lib

Flag	Description
libotf	Use <pkg>dev-libs/libotf</pkg> to handle OpenType fonts

md4c

Flag	Description
md2html	Build the md2html cli tool

onigmo

Flag	Description
combination-explosion-check	enable combination explosion check

opensc

Flag	Description
ctapi	Use CT-API for accessing Smartcard hardware
openct	Use <pkg>dev-libs/openct</pkg> (and CT-API) for accessing Smartcard hardware
pace	Use <pkg>dev-libs/openpace</pkg> for EAC version 2 support
secure-messaging	Enable secure messaging

pocl

Flag	Description
accel	Enable the generic hardware accelerator device driver
float-conversion	When enabled, OpenCL printf() call's f/e/g formatters are handled by pocl. When disabled, these are handled by system C library.
hardening	Enable hardening against various attacks. May worsen performance
memmanager	Enables custom memory manager. Except for special circumstances, this should be disabled

poco

Flag	Description
activerecord	Add ActiveRecord support
cppparser	Build and install a minimal C++ parser
file2pagecompiler	Utility to convert ordinary files to Page Compiler source files
pagecompiler	Simple compiler translating HTML pages containing embedded C++ code into HTTPRequestHandler classes
pocodoc	POCO documentation generator
util	Several utility classes (like logger, timer, config file parser). Also enables JSON

ppl

Flag	Description
lpsol	Build the ppl_lpsol linear program solver that uses <pkg>sci-mathematics/glpk</pkg> for its input routines

protobuf

Flag	Description
libprotoc	Build libprotoc
libupb	Build libupb
protoc	Build libprotoc and protoc compiler

sentry-native

Flag	Description
breakpad	Use <pkg>dev-util/breakpad</pkg> as the crash handler

serdisplib

Flag	Description
${IUSE/+lcd_devices_directgfx/+lcd_devices_directgfx}

simdjson

Flag	Description
all-impls	Enable all implementations rather than only onem

softhsm

Flag	Description
migration-tool	Build db migration tool

starpu

Flag	Description
spinlock-check	Enable spinlock check

tinyxml

Flag	Description
stl	Compile with TIXML_USE_STL support

tre

Flag	Description
agrep	Build agrep tool
approx	Enable the approximate matching functionality

weston

Flag	Description
desktop	Enable the desktop shell
fullscreen	Enable fullscreen shell
ivi	Enable the IVI shell
remoting	Enable plugin to stream output to remote hosts using <pkg>media-libs/gstreamer</pkg>
resize-optimization	Increase performance, allocate more RAM. Recommended to disable on Raspberry Pi
screen-sharing	Enable screen-sharing through RDP
wayland-compositor	Enable Wayland compositor support

xapian-bindings

Flag	Description
${LUA_REQUIRED_USE}

xmlrpc-c

Flag	Description
abyss	Build the Abyss mini web-server.

dev-lisp

clisp

Flag	Description
hyperspec	Use local hyperspec instead of online version

ecl

Flag	Description
gengc	Use generational garbage collection (experimental)
precisegc	Use type information during garbage collection (experimental)

gcl

Flag	Description
ansi	Build a GCL with ANSI support (else build a traditional CLtL1 image)

dev-lua

lua-cjson

Flag	Description
internal-fpconv	Enable internal number conversion routines, can increase overall performance by up to 50%

dev-ml

logs

Flag	Description
fmt	Enables the Logs_fmt reporter.
lwt	Enables the Logs_lwt library that provides Lwt logging functions.

tiny_httpd

Flag	Description
camlzip	Interface to camlzip for tiny_httpd

uutf

Flag	Description
utftrip	Builds and install the utftrip executable: Among other things, reads unicode on stdin and rewrites it on stdout.

dev-perl

App-Nopaste

Flag	Description
gitlab	Ensure git is installed for reading/passing GitLab authentication
pastebin	pastebin.com support

Boulder

Flag	Description
genbank	Provide support with Boulder::Genbank for decoding Genbank data records
store	Provide support with Boulder::Store for persisting Stone objects

Config-Any

Flag	Description
conf	Install <pkg>dev-perl/Config-General</pkg> to support decoding .conf/.cnf files

Coro

Flag	Description
ev	Build support for using <pkg>dev-perl/EV</pkg> as an event-loop via Coro::EV

DBIx-Class

Flag	Description
admin-script	Modules required for the CLI DBIx::Class interface dbicadmin
replicated	Modules required for DBIx::Class::Storage::DBI::Replicated

File-Which

Flag	Description
pwhich	Install <pkg>dev-perl/App-pwhich</pkg> which used to be a part of this package

GD

Flag	Description
animgif	Enable animated gif support
fcgi	Build for FastCGI compatibility via <pkg>dev-libs/fcgi</pkg> instead of using PerlIO

HTML-Mason

Flag	Description
modperl	Enable <pkg>www-apache/mod_perl</pkg> support

MCE

Flag	Description
sereal	Install <pkg>dev-perl/Sereal-Encoder</pkg> and decoder for faster worker IPC

Mail-IMAPClient

Flag	Description
md5	Install support for DIGEST-MD5 and CRAM-MD5 Authentication

PDL

Flag	Description
badval	Enable bad values support
netpbm	Enable NETPBM and MPEG support
pdl2	Build pdf2 shell (requires Devel-REPL)

Sysadm-Install

Flag	Description
hammer	Enable hammer() funtion to run a command in the shell and simulate a user hammering the ENTER key to accept defaults on prompts

perl-headers

Flag	Description
sizeof-warning	Include logic to warn when a .ph file tries to use a sizeof() that is unknown

dev-php

maxmind-db-reader

Flag	Description
extension	Build the C extension that uses <pkg>dev-libs/libmaxminddb</pkg>

pecl-apcu

Flag	Description
lock-
lock-pthreadmutex	Enable pthread mutex locking
lock-pthreadrw	Enable pthread read/write locking
lock-semaphore	Enable semaphore locks instead of fcntl
lock-spinlock	Enable spin locks (EXPERIMENTAL)

dev-python

authlib

Flag	Description
django	Enable Django framework support
jose	Enable JSON Object Signing and Encryption (JOSE) support via <pkg>dev-python/pycryptodome</pkg>

autobahn

Flag	Description
xbr	Add support for XBR decentralized data markets and etherium blockchain

bpython

Flag	Description
jedi	Enable autocompletion using <pkg>dev-python/jedi</pkg>
watch	Enable watching paths using <pkg>dev-python/watchdog</pkg>

cvxopt

Flag	Description
dsdp	Use interior point library <pkg>sci-libs/dsdp</pkg>

dnspython

Flag	Description
https	Enable DNS-over-HTTPS.

ipython

Flag	Description
nbconvert	Enable support for converting notebooks to various formats using <pkg>app-text/pandoc</pkg>
notebook	Install requirements for the web notebook based on <pkg>dev-python/tornado</pkg>

matplotlib

Flag	Description
excel	Pull <pkg>dev-python/xlwt</pkg> for the exceltools toolkit
webagg	Enable webagg backend that uses <pkg>dev-python/tornado</pkg>

mido

Flag	Description
rtmidi	Support using <pkg>media-libs/rtmidi</pkg> as MIDI back-end

numpy

Flag	Description
asimd{,hp,dp,fhm}
avx512_{bf16,bitalg,fp16,vbmi2}
avx512{bw,dq,vl}
neon{,-fp16}
sve
vfpv4
vsx
vsx2
vsx3
vsx4

pandas

Flag	Description
full-support	Pull all packages to give pandas full support

pillow

Flag	Description
raqm	Support setting text direction, language or font features. Requires <pkg>media-libs/raqm</pkg>.

pivy

Flag	Description
quarter	Use <pkg>media-libs/quarter</pkg> for GUI bindings
soqt	Use <pkg>media-libs/SoQt</pkg> for GUI bindings

pyside

Flag	Description
${!QT_MODULES[*]}
core	Build QtCore module, if disable then only shiboken will be built
network-auth	Build QtNetworkAuth module
uitools	Build UITools module

python-lsp-server

Flag	Description
all-plugins	Pull in all optional plugins

python-mpd2

Flag	Description
twisted	Enable twisted support

python-stdnum

Flag	Description
vies	Enable VIES

python-tests

Flag	Description
python3_12
python3_13
python3_14
python3_14t
python3_15
python3_15t
python_targets_(

rarfile

Flag	Description
compressed	Enables the module to support compressed v3 archives by calling the <pkg>app-arch/unrar</pkg>.

rfc3986

Flag	Description
idna	enable support for the IDNA specification (RFC 5891)

sympy

Flag	Description
pyglet	Use <pkg>dev-python/pyglet</pkg> for plots and print preview

translate-toolkit

Flag	Description
subtitles	Support conversion between po and sub files

twisted

Flag	Description
conch	include Twisted SSHv2 implementation

dev-qt

qt-creator

Flag	Description
plugin-dev	Install the 'Devel' component needed to build external Qt Creator plugins
qmldesigner	Build QmlDesigner and related plugins (Insight, StudioWelcome)
serialterminal	Build the serial terminal plugin

qt-docs

Flag	Description
activeqt	Install documentation for ActiveQt (unpackaged, Windows-only)
canvaspainter	Install documentation for QtCanvasPainter (unpackaged)
connectivity	Install documentation for <pkg>dev-qt/qtconnectivity</pkg>
datavis	Install documentation for QtDataVisualization (unpackaged)
declarative	Install documentation for <pkg>dev-qt/qtdeclarative</pkg>
imageformats	Install documentation for <pkg>dev-qt/qtimageformats</pkg>
lottie	Install documentation for QtLottie (unpackaged)
networkauth	Install documentation for <pkg>dev-qt/qtnetworkauth</pkg>
openapi	Install documentation for QtOpenAPI (unpackaged)
qt5compat	Install documentation for <pkg>dev-qt/qt5compat</pkg>
quick3dphysics	Install documentation for QtQuick3DPhysics (unpackaged)
quickeffectmaker	Install documentation for QtQuickEffectMaker (unpackaged)
shadertools	Install documentation for <pkg>dev-qt/qtshadertools</pkg>
tasktree	Install documentation for <pkg>dev-qt/qttasktree</pkg>
timeline	Install documentation for <pkg>dev-qt/qtquicktimeline</pkg>

qtbase

Flag	Description
$(
${QT6_IUSE[gui]//+/}
${QT6_IUSE[network]//+/}
${QT6_IUSE[sql]//+/}
${QT6_IUSE[widgets]//+/}
journald	Log messages using <pkg>sys-apps/systemd</pkg>'s journald rather than output to stderr (override with the QT_FORCE_STDERR_LOGGING=1 env var)
printf

qtconnectivity

Flag	Description
neard	Use <pkg>net-wireless/neard</pkg> to access NFC devices

qtspeech

Flag	Description
speechd	Enable text-to-speech synthesizer plugin using <pkg>app-accessibility/speech-dispatcher</pkg> engine

qttools

Flag	Description
distancefieldgenerator	Build Qt Distance Field Generator
kmap2qmap	Build tool to generate keymaps for use on Embedded Linux
linguist	Build Qt Linguist tools (GUI requires USE=widgets and USE=qml)
pixeltool	Build Qt Pixeltool
qdbus	Build the Qt D-Bus Interface (D-Bus Viewer requires USE=widgets)
qdoc	Build Qt Documentation Generator
qtattributionsscanner	Build Qt Source Code Attribution Scanner
qtdiag	Build Qt Diag
qtplugininfo	Build Qt Plugin Info

qtwebengine

Flag	Description
webdriver	Build tool for automated testing (ChromeDriver equivalent)

dev-ruby

asciidoctor-diagram

Flag	Description
""
"barcode"
"dev-ruby/rqrcode
"dev-tex/pgf
"ditaa"
"gnuplot"
"graphviz"
"lilypond"
"media-gfx/ditaa"
"media-gfx/graphviz"
"media-gfx/imagemagick[png]"
"media-gfx/mscgen[png]"
"media-gfx/plantuml"
"media-sound/lilypond"
"meme"
"mscgen"
"plantuml"
"remove_ditaa"
"remove_plantuml"
"sci-visualization/gnuplot"
"tikz"
dev-ruby/barby[qrcode]"
ditaa	Enable diagrams with <pkg>media-gfx/ditaa</pkg>
lilypond	Enable diagrams with <pkg>media-sound/lilypond</pkg>
media-gfx/pdf2svg"
meme	Enable diagrams with <pkg>media-gfx/imagemagick</pkg>
mscgen	Enable diagrams with <pkg>media-gfx/mscgen</pkg>
plantuml	Enable diagrams with <pkg>media-gfx/plantuml</pkg>
tikz	Enable diagrams with <pkg>dev-tex/pgf</pkg>

barby

Flag	Description
prawn	Add support for writing PDF documents using <pkg>dev-ruby/prawn</pkg>.
rmagick	Add support for writing images (among others PNG, GIF and JPEG) using <pkg>dev-ruby/rmagick</pkg>. Not available on JRuby.

faraday_middleware

Flag	Description
mashify	Include FaradayMiddleware::Mashify
parsexml	Include FaradayMiddleware::ParseXml
rashify	Include FaradayMiddleware::Rashify

jwt

Flag	Description
eddsa	Support EdDSA algorithm using dev-ruby/rbnacl

net-ssh

Flag	Description
chacha20	Use <pkg>dev-ruby/rbnacl</pkg> for chacha20-poly1305@openssh.com support

dev-scheme

guile

Flag	Description
debug-freelist	Include garbage collector freelist debugging code
debug-malloc	Include malloc debugging code
discouraged	(implied by deprecated) enable merely discouraged features

kawa

Flag	Description
awt	Assume AWT is available
jemacs	Build JEmacs
krl	Build BRL emulation and KRL
sax	Assume SAX2 is available with <pkg>dev-java/sax</pkg>
servlets	Build support for generating servlets with Java servletapi

racket

Flag	Description
futures	Enable racket/future library for fine-grained hardware parallelism
places	Enable racket/place library for share-nothing parallelism and message-passing communication. Compared to futures, places are heavyweight, but they have a simpler performance model.

scm

Flag	Description
arrays	Support for arrays, uniform-arrays and uniform-vectors.
bignums	Support for large precision integers.
cautious	SCM will always check the number of arguments to interpreted closures.
dynamic-linking	Be able to load compiled files while running.
engineering-notation	Floats to display in engineering notation (exponents always multiples of 3) instead of scientific notation.
gsubr	generalized c arguments: for arbitrary (more then 11) arguments to C functions.
inexact	Support for floating point numbers.
ioext	Commonly available I/O extensions: line I/O, file positioning, file delete and rename, and directory functions.
libscm	Build and install libscm.a and related headers
macro	C level support for hygienic and referentially transparent macros (syntax-rules macros).
unix	Support for: nice, acct, lstat, readlink, symlink, mknod and sync.

slib

Flag	Description
gambit	Support for gambit scheme implementation
scm	Support for scm scheme implementation

dev-tcltk

tktreectrl

Flag	Description
shellicon	shellicon extension

dev-tex

abntex

Flag	Description
lyx	Install with <pkg>app-office/lyx</pkg> layout

biblatex

Flag	Description
biber	Install the unicode compatible backend processor

pythontex

Flag	Description
highlighting	Syntax highlighting using <pkg>dev-python/pygments</pkg>

dev-util

buildbot

Flag	Description
docker	Add support for worker docker command steps

cargo-audit

Flag	Description
fix	Add support for 'fix' subcommand (experimental)

catalyst

Flag	Description
qcow2	Pulls in the depends for building qcow2 images

ccache

Flag	Description
static-c++	Avoid dynamic dependency on gcc's libstdc++.

cccc

Flag	Description
mfc	Add patch for MFC dialect options

cppcheck

Flag	Description
htmlreport	install cppcheck-htmlreport

devhelp

Flag	Description
gedit	Install plugin for <pkg>app-editors/gedit</pkg>

diffoscope

Flag	Description
binutils	Use <pkg>sys-devel/binutils</pkg>
cpio	Use <pkg>app-alternatives/cpio</pkg>
docx	Use <pkg>app-text/docx2txt</pkg>
find	Use <pkg>sys-apps/findutils</pkg>
haskell	Use <pkg>dev-lang/ghc</pkg>
hex	Use <pkg>app-editors/vim-core</pkg>
opendocument	Use <pkg>app-text/odt2txt</pkg>
pascal	Use <pkg>dev-lang/fpc</pkg>
squashfs	Use <pkg>sys-fs/squashfs-tools</pkg>
tar	Use <pkg>app-arch/tar</pkg>

geany-plugins

Flag	Description
geniuspaste	Enable the GeniusPaste plugin
gtkspell	Use gtkspell for dictionary support in GeanyVC
pretty-printer	Enable pretty-printer plugin
scope	Enable the scope plugin which is a graphical GDB front-end
webhelper	Enable webhelper plugin
workbench	Enable workbench plugin

glade

Flag	Description
gjs	Build catalog support for <pkg>dev-libs/gjs</pkg> widgets.

gnome-builder

Flag	Description
d-spy	Provide D-Bus debugging functionality via <pkg>dev-debug/d-spy</pkg>

google-perftools

Flag	Description
pagesize-128k	Use 128K page size for tcmalloc. Larger size makes tcmalloc faster, at the cost of using more space (due to internal fragmentation)
pagesize-16k	Use 16K page size for tcmalloc. Larger size makes tcmalloc faster, at the cost of using more space (due to internal fragmentation)
pagesize-256k	Use 256K page size for tcmalloc. Larger size makes tcmalloc faster, at the cost of using more space (due to internal fragmentation)
pagesize-32k	Use 32K page size for tcmalloc. Larger size makes tcmalloc faster, at the cost of using more space (due to internal fragmentation)
pagesize-64k	Use 64K page size for tcmalloc. Larger size makes tcmalloc faster, at the cost of using more space (due to internal fragmentation)

intellij-idea

Flag	Description
professional	Enable the Professional version which requires a license purchased from Jetbrains.

kdevelop

Flag	Description
gdbui	Enable GUI for attaching GDB to a running process
qmake	Enable support for QMake build system

libabigail

Flag	Description
btf	Handle reading kernel debug files in BTF format via <pkg>dev-libs/libbpf</pkg>

llvm-mingw64

Flag	Description
arm64-pe	Enable the aarch64-w64-mingw32 target
arm64ec-pe	Enable the arm64ec-w64-mingw32 target
i686-pe	Enable the i686-w64-mingw32 target
x86-64-pe	Enable the x86_64-w64-mingw32 target

lttng-tools

Flag	Description
ust	Support LTTng-UST (Userspace Tracing)

massif-visualizer

Flag	Description
callgraph	Enable detailed snapshot analysis using <pkg>media-gfx/kgraphviewer</pkg>

mingw64-runtime

Flag	Description
default-ucrt	Use ucrt instead of msvcrt-os as the default crt (WARNING: incompatible with each others and also for building Wine with USE=mingw, pick one from the start and keep it)
idl	Install idl files
libraries	Build extra libraries: mangle, pseh, winpthreads

nvidia-cuda-toolkit

Flag	Description
nsight	Install profiling and optimizing tools (nsight-compute, nsight-systems)
sanitizer	Install compute-sanitizer tool
vis-profiler	Install the NVIDIA CUDA visual profiler (nvvp)

perf

Flag	Description
libtraceevent	Enable <pkg>dev-libs/libtraceevent</pkg> support

plan9port

Flag	Description
freefonts	Don't install BigelowHolmes fonts

poke

Flag	Description
pvm-profiling	Enable profiling in the PVM

sccache

Flag	Description
azure	Enable Azure Blob Storage support
dist-client	Enables distributed support in the sccache client
dist-server	Enables the sccache-dist binary
gcs	Enable Google Cloud Storage support

schroot

Flag	Description
dchroot	Enables the building of a wrapper named "dchroot", replacing <pkg>sys-apps/dchroot</pkg>

sdl-jstest

Flag	Description
sdl1	Enable <pkg>media-libs/libsdl</pkg> based input test

shake

Flag	Description
embed-files	Embed data files into the shake library

vulkan-tools

Flag	Description
cube	Build the cube/cubepp demos

dev-vcs

fossil

Flag	Description
fusefs	Enable the Fuse Filesystem
tcl-private-stubs	Enable Tcl integration via private stubs mechanism
tcl-stubs	Enable Tcl integration via stubs library mechanism
th1-docs	Enable TH1 for embedded documentation pages
th1-hooks	Enable TH1 hooks for commands and web pages

git

Flag	Description
perforce	Add support for Perforce version control system (requires manual installation of Perforce client)
safe-directory	Respect the safe.directory setting

git-annex

Flag	Description
gitlfs	Build with git-lfs library (rather than vendored copy)
magicmime	Use libmagic to determine file MIME types
pairing	Enable pairing
parallelbuild	Enable production build (slower build; faster binary)
torrentparser	Use haskell torrent library to parse torrent files

git-delete-merged-branches

Flag	Description
full-name-executable	Install executable /usr/bin/git-delete-merged-branches that is in conflict with <pkg>dev-vcs/git-extras</pkg>

mercurial

Flag	Description
$(python_gen_useflags
'python3_12')
chg	Support Mercurial command server client

subversion

Flag	Description
plaintext-password-storage	Enable on-disk caching of plaintext passwords and passphrases. (Enabling this functionality will not force Subversion to store passwords in plaintext, but does permit users to explicitly allow that behavior via runtime configuration.)

games-action

dxx-rebirth

Flag	Description
d1x	Install Descent 1 resources and executable
d2x	Install Descent 2 resources and executable

fakk2

Flag	Description
nocd	Install all files required to run the application without a CD mounted

supertuxkart

Flag	Description
wiimote	Support for wiimote input devices

games-arcade

commandergenius

Flag	Description
downloader	Allows some Keen games to be downloaded from the menu

jazz2-data

Flag	Description
cc	Install The Christmas Chronicles additional data

oshu

Flag	Description
osu-skin	Include more complete osu-skin (other is minimal)

performous

Flag	Description
songs	Install a few demo songs

games-board

crafty

Flag	Description
no-opts	Don't try to enable crazy CFLAG options

freedoko

Flag	Description
backgrounds	Install additional background images
gnomecards	Install the gnome-games card set
kdecards	Install the KDE card set
openclipartcards	Install the openclipartcards card set
pysolcards	Install the PySol card set
xskatcards	Install the XSkat card set

lc0

Flag	Description
dnnl	Enable dnnl / OneDNN backend
onnx	Enable onnx backend

pysolfc

Flag	Description
extra-cardsets	Install extra cardsets

stockfish

Flag	Description
cpu_flags_arm_v7	Use instructions added in ARMv7
cpu_flags_x86_avx512dq	Use AVX-512 double- and quad-word instructions
general-32	Generic unoptimized 32-bits build
general-64	Generic unoptimized 64-bits build

tablebase-syzygy

Flag	Description
6-pieces	Install tablebases for 6 pieces (huge!)

xboard

Flag	Description
default-font	Install the default font that xboard uses
zippy	Enable experimental zippy client

games-emulation

atari800

Flag	Description
download	Support downloading ROMs automatically
encode-mp3	Support recording sound in MP3 format

dolphin

Flag	Description
log	Increase logging output
retro-achievements	Enables integration with retroachievements.org

dosbox

Flag	Description
core-inline	Enable memory-increasing inlines for better performance but requiring more build time
glide	Enable unofficial Glide emulation via <pkg>media-libs/openglide</pkg>

dosbox-staging

Flag	Description
dynrec	Use recompiling cpu core instead of dynamic x86/x64 specific cpu core
mt-32	Use <pkg>media-libs/munt-mt32emu</pkg> for MT-32 emulation

emutos

Flag	Description
'l10n_%s

generator

Flag	Description
sdlaudio	Enable SDL Audio

geolith-jg

Flag	Description
chdr	Build with <pkg>media-libs/libchdr</pkg> (.chd) support

hatari

Flag	Description
capsimage	Use <pkg>dev-libs/spsdeclib</pkg> to read .IPF, .RAW, and .CTR disk images

jgemu

Flag	Description
bsnes	Install bsnes for Super Nintendo
cega	Install Cega for SG-1000, Sega Master System and Game Gear
gambatte	Install Gambatte for Game Boy and Game Boy Color
geolith	Install Geolith for Neo Geo AES/MVS
jollycv	Install JollyCV for ColecoVision
mednafen	Install Mednafen for Atari Lynx, Nintendo Virtual Boy, NEC PC Engine, NEC SuperGrafx, Sony PlayStation, Sega Saturn, Super Nintendo, Neo Geo Pocket and WonderSwan
melonds	Install MelonDS for Nintendo DS
nestopia	Install Nestopia for Nintendo Entertainment System
prosystem	Install ProSystem for Atari 7800
sameboy	Install SameBoy for Game Boy and Game Boy Color
vecx	Install Vecx for Vectrex

mupen64plus

Flag	Description
audio-sdl	Enable SDL audio plugin.
input-sdl	Enable SDL input plugin.
rsp-hle	Enable HLE RSP plugin.
ui-console	Enable default console UI.
ui-m64py	Enable PyQt6 UI using <pkg>games-emulation/m64py</pkg>.
video-glide64mk2	Enable Glide64mk2 video plugin.
video-rice	Enable Rice video plugin.

rmg

Flag	Description
angrylion-plugin	Enable the mupen64plus-video-angrylion-plus XMAME licensed plugin
dynarec	Enable the new dynarec for the mupen64plus-core plugin

vbam

Flag	Description
link	Enable GBA linking functionality

games-engines

devilutionx

Flag	Description
zerotier	Enable ZeroTier for online public games

minetest

Flag	Description
spatial	Enable SpatialIndex AreaStore backend

odamex

Flag	Description
master	Build master server target (advertises odamex server list)
odalaunch	Build the wxWidgets based launcher

openmw

Flag	Description
osg-fork	Use OpenSceneGraph forked by OpenMW instead of upstream OSG.

scummvm

Flag	Description
mpeg2	enable mpeg2 codec for cutscenes

uzdoom

Flag	Description
swr	Enable the software renderer

games-fps

alephone

Flag	Description
video-export	Enable film export support

alienarena

Flag	Description
vidmode	Link against <pkg>x11-libs/libXxf86vm</pkg>. Required for full-screen support.

crispy-doom

Flag	Description
truecolor	Enable true-color rendering (experimental)

darkplaces

Flag	Description
cdsound	Enables using CD audio in the engine
lights	Install and setup the updated light maps

dsda-doom

Flag	Description
sdl2-image	Enable support for high-resolution textures and other image formats via <pkg>media-libs/sdl2-image</pkg>

eduke32

Flag	Description
duke3d	Install the Duke Nukem 3D data files, provided by <pkg>games-fps/duke3d-data</pkg>.
hrp	Install the Duke Nukem 3D High Resolution Pack.
opl	Install the Duke Nukem 3D OPL music files.
psx	Install the Duke Nukem 3D PSX high resolution voice files.
sc-55	Install the Duke Nukem 3D Roland SC-55 music files.
voidsw	Enable support for Shadow Warrior (Classic) through VoidSW.
voxels	Install the Duke Nukem 3D Voxels Pack.

nexuiz

Flag	Description
maps	Install the community map pack

quake2-icculus

Flag	Description
qmax	Build the pretty version (quake max)

urbanterror

Flag	Description
altgamma	Alternative way for gamma setting with modesetting driver
skeetshootmod	Build support for skeetshoot mod for specific maps
voip	Use ioq3 ingame VoIP (experimental)

ut2004-data

Flag	Description
megapack	Download the Mega Pack content. Mandatory unless using the OldUnreal, Unreal Anthology, or GOG editions.

xonotic

Flag	Description
ode	Enable support for physics engine from <pkg>dev-games/ode</pkg>

yamagi-quake2

Flag	Description
ctf	Build support for the 'Capture The Flag' addon
softrender	Build software renderer

games-mud

tf

Flag	Description
atcp	enable ATCP support.
gmcp	enable GMCP support.
option102	enable telnet option 102 support.

games-roguelike

stone-soup

Flag	Description
advpng	Use alternate png optimization.
tiles	Enable for graphical (tiled) build. (can be enabled on top of ncurses)

games-rpg

deponia-doomsday

Flag	Description
bonus	Install the bonus content (Art Book, Concept Art, Soundtrack)

dreamweb

Flag	Description
l10n_en-GB	English (United Kingdom)

kqlives

Flag	Description
cheats	Enable cheating mode

the-longest-journey

Flag	Description
hd	Install high definition backgrounds and sprites
hd-fmv	Install upscaled full motion videos

games-simulation

openttd

Flag	Description
openmedia	Enables the free open media sets: OpenGFX, OpenSFX, OpenMSX, removing the requirement for proprietary TTD assets to play OpenTTD.

simutrans-paksets

Flag	Description
128	Install higher resolution scenario data (128 px graphics)
comic192	Install comic-like scenario data (192 px graphics)
cs128	Install Czech-Slovak scenario data (128 px graphics)
excentrique48	Install eccentric scenario data (48 px graphics)
german128	Install German scenario data (128 px graphics)
nippon64	Install Nippon scenario data (64 px graphics)

games-sports

speed-dreams

Flag	Description
osggraph	Enable the new work-in-progress 3D engine using <pkg>dev-games/openscenegraph</pkg>
webstats	Enable support for sending racing statistics to a web server (experimental)

xmoto

Flag	Description
system-ode	Use system <pkg>dev-games/ode</pkg> instead of the bundled one

games-strategy

0ad

Flag	Description
nvtt	Support for some uncompressed data formats (might be needed for some mods)

colobot

Flag	Description
devbuild	TODO

freeciv

Flag	Description
mapimg	Additional mag image toolkit via <pkg>media-gfx/imagemagick</pkg>
modpack	Build the freeciv-modpack-program to download/install mods
rule-editor	Build ruleset editor
web-server	Build the freeciv-web server in place of the freeciv server

ja2-stracciatella

Flag	Description
ru-gold	Support for russian gold ja2 version

megaglest

Flag	Description
model-viewer	Build model viewer
streflop	Use the library streflop. Out of synchs may occur if not enabled.
wxuniversal	Use the wxUniversal port which implements the various GUI controls by drawing them itself

seven-kingdoms

Flag	Description
multiplayer	Enable multiplayer.

uqm

Flag	Description
remix	download and install remixed music files (large)

vcmi

Flag	Description
erm	Enable compilation of ERM scripting module
translations	Install translations

wargus

Flag	Description
bne	Support extracting data from the Battle.net Edition

games-util

heroic-bin

Flag	Description
gamescope	Run Heroic Launcher inside gamescope

gnome-base

gdm

Flag	Description
bluetooth-sound	Allow loading of bluetooth sound modules. This may be necessary for accessibility screen readers, but may cause bluetooth sound issues for users logging in.
fprint	Enables experimental fingerprint authentication using <pkg>sys-auth/fprintd</pkg>

gnome-extra-apps

Flag	Description
shotwell	Install the <pkg>media-gfx/shotwell</pkg> photo manager

gvfs

Flag	Description
afp	Enables support for accessing AFP (Apple Filing Protocol) network shares
google	Enables support for accessing Google accounts via <pkg>dev-libs/libgdata</pkg>
onedrive	Enable Onedrive backend via <pkg>net-libs/msgraph</pkg>

nautilus

Flag	Description
previewer	Use <pkg>gnome-extra/sushi</pkg> to preview files from the file manager

gnome-extra

evolution-data-server

Flag	Description
oauth-gtk3	Enable internal OAuth2 authentication for GTK+3 applications (libedataserverui-*.so) support for Google and Outlook.com. If gnome-online-accounts is enabled and used, this is not necessary, but both can be supported at the same time with different setup at runtime
oauth-gtk4	Enable internal OAuth2 authentication for GTK 4 applications (libedataserverui4-*.so) support for Google and Outlook.com. If gnome-online-accounts is enabled and used, this is not necessary, but both can be supported at the same time with different setup at runtime

gnome-software

Flag	Description
dkms	Enable DKMS plugin to help installing DKMS (and akmods) Secure Boot certificates to UEFI MOK

libgda

Flag	Description
canvas	Enable support for <pkg>x11-libs/goocanvas</pkg>

pch-session

Flag	Description
breeze	Use Breeze KDE theme as first option over Fusion for QT apps

gnustep-apps

gemas

Flag	Description
projectcenter	Build and install plugin for <pkg>gnustep-apps/projectcenter</pkg>

gworkspace

Flag	Description
gwmetadata	Enable the metadata indexing and searching system

sogo

Flag	Description
activesync	Build the ActiveSync support code

gnustep-base

gnustep-make

Flag	Description
libobjc2	Enables use of the GNUstep Objective-C runtime (<pkg>gnustep-base/libobjc2</pkg>) with non-fragile ABI and <pkg>llvm-core/clang</pkg> compiler
native-exceptions	Enables use of the native Objective-C exception support (@try/@catch/@finally) built-in objective-c exceptions with compilers that support it

gui-apps

foot

Flag	Description
grapheme-clustering	Enable grapheme clustering support

gtkgreet

Flag	Description
layershell	Enable layer shell support

kanshi

Flag	Description
varlink	Enable remote control with varlink

sddm-gentoo-config

Flag	Description
kwin	KWin DisplayServer support (EXPERIMENTAL)
weston	Weston DisplayServer support (EXPERIMENTAL)

waybar

Flag	Description
logind	Enable support for logind (bluetooth and idle inhibit)
niri	Enable support for Niri Wayland compositor

waypipe

Flag	Description
avx2:with_avx2
avx512f:with_avx512f
dmabuf	Use DMABUFs for data exchange and hardware decoding
neon:with_neon_opts
sse3:with_sse3

gui-libs

gtk4-layer-shell

Flag	Description
smoke-tests	Test that all examples can run

neatvnc

Flag	Description
h264	Enable H.264 encoding

wlroots

Flag	Description
liftoff	Enable support for libliftoff KMS plane backend
x11-backend	Enable support for handling input/output devices through <pkg>x11-libs/libxcb</pkg>

gui-wm

gamescope

Flag	Description
wsi-layer	Enable the WSI layer (required for HDR)

sway

Flag	Description
swaybar	Install 'swaybar': sway's status bar component
swaynag	Install 'swaynag': shows a message with buttons

kde-apps

cantor

Flag	Description
analitza	Enable <pkg>kde-apps/analitza</pkg> backend support
julia	Enable <pkg>dev-lang/julia-bin</pkg> backend support

gwenview

Flag	Description
annotate	Enable support for image annotations using <pkg>media-libs/kimageannotator</pkg>

kalzium

Flag	Description
solver	Enable the equation solver

kate-addons

Flag	Description
filebrowser	Enable File System browser tool view
lspclient	Enable LSP (Language Server Protocol) client plugin
snippets	Enable Snippets Tool View plugin to manage or download code snippets

kde-apps-meta

Flag	Description
education	Pull in <pkg>kde-apps/kdeedu-meta</pkg> packages

kdemultimedia-meta

Flag	Description
cdrom	Include packages for optical discs

kdenetwork-meta

Flag	Description
dropbox	Enable support for Dropbox in <pkg>kde-apps/dolphin</pkg> via <pkg>kde-apps/dolphin-plugins-dropbox</pkg>

kdepim-addons

Flag	Description
importwizard	Enable additional import plugins for <pkg>kde-apps/akonadi-import-wizard</pkg>
itinerary	Enable plugins for <pkg>kde-apps/kitinerary</pkg>

kdepim-runtime

Flag	Description
ews	Enable support for Microsoft Exchange Web Services

kdeutils-meta

Flag	Description
lrz	Install <pkg>app-arch/lrzip</pkg> for LRZ archive support in <pkg>kde-apps/ark</pkg>

kmag

Flag	Description
keyboardfocus	Enable keyboard focus tracking

marble

Flag	Description
aprs	Enable support for APRS data sources
pbf	Enable OpenStreetMap PBF file support via <pkg>dev-libs/protobuf</pkg>

thumbnailers

Flag	Description
blender	Enable blender thumbnail generation using <pkg>kde-frameworks/karchive</pkg>

yakuake

Flag	Description
absolute-position	Use <pkg>kde-plasma/kwayland</pkg> for absolute window positioning in KWin

kde-frameworks

knewstuff

Flag	Description
opds	Enable support for the Open Publication Distribution System via <pkg>kde-frameworks/syndication</pkg>

kwallet-runtime

Flag	Description
legacy-kwallet	Support KWallet D-Bus API for applications still using it

kde-misc

kdeconnect

Flag	Description
telephony	Enable telephony plugin using <pkg>kde-frameworks/modemmanager-qt</pkg>

krename

Flag	Description
office	Enable support for file naming based on ODF metadata

tellico

Flag	Description
bibtex	Add support for bibtex importing using btparse from <pkg>dev-perl/Text-BibTeX</pkg>
yaz	Add support for searching Z39.50 databases

kde-plasma

kdeplasma-addons

Flag	Description
alternate-calendar	Support alternate calendar systems (currently Chinese or Indian) via <pkg>dev-libs/icu</pkg>

kwin-x11

Flag	Description
nightlight	Enable night light support via <pkg>kde-plasma/knighttime</pkg>

plasma-meta

Flag	Description
browser-integration	Enable integration with Chrome/Firefox with browser extensions
crash-handler	Pull in <pkg>kde-plasma/drkonqi</pkg> for assisted upstream crash reports
discover	Pull in resources management GUI; a centralised GHNS alternative and optional <pkg>sys-apps/fwupd</pkg> frontend
firewall	Pull in <pkg>kde-plasma/plasma-firewall</pkg> for system firewall administration
oxygen-theme	Pull in Oxygen icons, sound theme and visual style for KDE Plasma
thunderbolt	Pull in <pkg>kde-plasma/plasma-thunderbolt</pkg> control center module
wacom	Pull in <pkg>kde-plasma/wacomtablet</pkg> control center module

plasma-workspace

Flag	Description
appstream	Enable AppStream software metadata support
wallpaper-metadata	Show metadata for image wallpaper plugin using <pkg>kde-apps/libkexiv2</pkg>

powerdevil

Flag	Description
brightness-control	Enable screen brightness control using <pkg>app-misc/ddcutil</pkg>

llvm-core

clang

Flag	Description
static-analyzer	Install the Clang static analyzer

clang-common

Flag	Description
bootstrap-prefix	!!internal use only!! DO NOT SET THIS FLAG YOURSELF!, used for bootstrapping Gentoo Prefix

clang-toolchain-symlinks

Flag	Description
gcc-symlinks	Install symlinks for 'gcc' and 'g++' for extra compatibility.

llvm

Flag	Description
binutils-plugin	Build the binutils plugin
exegesis	Enable performance counter support for llvm-exegesis tool that can be used to measure host machine instruction characteristics
xar	Support dumping LLVM bitcode sections in Mach-O files (uses <pkg>app-arch/xar</pkg>)

llvm-runtimes

clang-runtime

Flag	Description
compiler-rt	Install <pkg>llvm-runtimes/compiler-rt</pkg> for -rtlib=compiler-rt
llvm_targets_SPIRV	Support SPIR-V language target for graphics and parallel computing
polly	Load Polly plugin (you still need -mllvm -polly to use it)

compiler-rt

Flag	Description
atomic-builtins	Compile atomic builtins into compiler-rt.builtins. This is needed on systems without GCC/libatomic, but requires using Clang to build.

compiler-rt-sanitizers

Flag	Description
cfi	Build Control Flow Integrity runtime.
ctx-profile	Build ctx profiling runtime.
dfsan	Build Data Flow Sanitizer runtime.
gwp-asan	Build GWP-ASAN runtime.
hwasan	Build Hardware ASAN runtime.
libfuzzer	Build fuzzing runtime.
lsan	Build Leak Sanitizer runtime.
memprof	Build memory profiler runtime.
msan	Build Memory Sanitizer runtime.
nsan	Build Numerical Sanitizer runtime.
rtsan	Build Realtime Sanitizer runtime.
safestack	Build SafeStack runtime.
scudo	Build Scudo Hardened Allocator.
shadowcallstack	Build ShadowCallStack.
tsan	Build Thread Sanitizer runtime.
xray	Build XRay runtime.

libclc

Flag	Description
video_cards_r600	VIDEO_CARDS setting to build only r600, r700, Evergreen and Northern Islands based chips code for radeon

libcxx

Flag	Description
libcxxabi	Build on top of <pkg>llvm-runtimes/libcxxabi</pkg> instead of gcc's libsupc++ (avoids depending on gcc).

openmp

Flag	Description
gdb-plugin	Build OMPD GDB plugin
level-zero	Build <pkg>dev-libs/level-zero</pkg> offloading support for Intel GPUs.

lxqt-base

lxqt-config

Flag	Description
touchpad	Build touchpad settings tool

lxqt-meta

Flag	Description
about	Install <pkg>lxqt-base/lxqt-about</pkg>
archiver	Install <pkg>app-arch/lxqt-archiver</pkg>
desktop-portal	Enable the LXQt <pkg>sys-apps/xdg-desktop-portal</pkg> backend implementation
filemanager	Install <pkg>x11-misc/pcmanfm-qt</pkg> file manager
lximage	Install <pkg>media-gfx/lximage-qt</pkg> image viewer
powermanagement	Install <pkg>lxqt-base/lxqt-powermanagement</pkg> package
processviewer	Install <pkg>x11-misc/qps</pkg> package
screenshot	Install <pkg>x11-misc/screengrab</pkg> package
ssh-askpass	Install <pkg>lxqt-base/lxqt-openssh-askpass</pkg> user password prompt tool
trash	Install <pkg>gnome-base/gvfs</pkg> to enable 'trash:///', 'computer:///' and other such "places" in <pkg>x11-misc/pcmanfm-qt</pkg>
window-manager	Install <pkg>kde-plasma/kwin</pkg> window manager

lxqt-panel

Flag	Description
colorpicker	Build colorpicker plugin
cpuload	Build cpuload plugin
desktopswitch	Build desktopswitch plugin
directorymenu	Build directorymenu plugin
dom	Build dom plugin
kbindicator	Build kbindicator plugin
mainmenu	Build mainmenu plugin
networkmonitor	Build networkmonitor plugin
quicklaunch	Build quicklaunch plugin
showdesktop	Build showdesktop plugin
spacer	Build spacer plugin
statusnotifier	Build statusnotifier plugin
sysstat	Build sysstat plugin
taskbar	Build taskbar plugin
volume	Build volume plugin
worldclock	Build worldclock plugin

mail-client

alpine

Flag	Description
chappa	enhance Alpine by applying Eduardo Chappa's patches
onlyalpine	installs only the alpine binary, so it does not collied with pico and/or pine
passfile	Adds support for caching passwords into a file between sessions

balsa

Flag	Description
rubrica	Adds support for rubrica addressbook

claws-mail

Flag	Description
litehtml	Enable <pkg>dev-libs/gumbo</pkg> html viewer plugin
spam-report	Enable plugin for spam reporting to various services

mutt

Flag	Description
hcache	Enable header cache, one database backend needs to be enabled

neomutt

Flag	Description
pgp-classic	Build classic-pgp backend to support PGP/MIME and traditional/inline PGP
smime-classic	Build classic-smime backend to support S/MIME

roundcube

Flag	Description
change-password	Allow users to change passwords through Roundcube
enigma	Add dependencies to support server-side GnuPG signing and/or encryption through the enigma plugin

thunderbird

Flag	Description
system-librnp	Use system-wide <pkg>dev-util/librnp</pkg> instead of bundled one.

mail-filter

MailScanner

Flag	Description
exim	Set <pkg>mail-mta/exim</pkg> to used MTA

amavisd-new

Flag	Description
razor	Add support for <pkg>mail-filter/razor</pkg>
rspamd	Add support for <pkg>mail-filter/rspamd</pkg> extension (HTTP only)
rspamd-https	Add support for <pkg>mail-filter/rspamd</pkg> extension (both HTTP and HTTPS)

maildrop

Flag	Description
authlib	Add courier-authlib support
dovecot	Add dovecot authentication support

opendkim

Flag	Description
opendbx	Use opendbx backend to facilitate dataset driven OpenDKIM configuration options like stats, bodylengthdb, etc. against a wide variety of database types
querycache	Add support for query caching (requires 'berkdb' flag)

pyzor

Flag	Description
pyzord	Enable the pyzord server daemon

spamassassin

Flag	Description
qmail	Build qmail functionality and docs

mail-mta

courier

Flag	Description
norewrite	Prevents courier mail server from mangling virtual user addresses when sending
webmail	Enable the webmail interface

exim

Flag	Description
arc	Adds support for Authenticated Receive Chain (ARC)
dcc	Adds support for Distributed Checksum Clearinghouse (DCC)
dlfunc	Install local_scan.h header to compile separate dlfunc libraries
dmarc	Adds support for DMARC
dnsdb	Adds support for a DNS search for a record whose domain name is the supplied query
dsn	Adds support for Delivery Status Notifications (DSN)
lmtp	Adds support for lmtp
mbx	Adds support for UW's mbx format
prdr	Adds support for Per-Recipient Data Response
srs	Adds support for Sender Rewriting Scheme
tpda	Adds support for Transport Post-Delivery Actions

postfix

Flag	Description
ldap-bind	Add support for binding to LDAP backend using <pkg>dev-libs/cyrus-sasl</pkg>
tlsrpt	Add support for TLSRPT protocol

sendmail

Flag	Description
tinycdb	Add support for using <pkg>dev-db/tinycdb</pkg> for lookup tables

mate-base

mate-applets

Flag	Description
cpupower	Enable support for cpu frequency manipulation using <pkg>sys-power/cpupower</pkg>

mate-settings-daemon

Flag	Description
rfkill	build support for rfkill

mate-extra

caja-extensions

Flag	Description
gajim	Add an extension to support <pkg>net-im/gajim</pkg>.
image-converter	Add image conversion support.
open-terminal	Add an extension to support an open terminal.
wallpaper	Add an extension to support setting an image as the current wallpaper

mate-system-monitor

Flag	Description
wnck	Enable experimental support using <pkg>x11-libs/libwnck</pkg>.

mate-tweak

Flag	Description
dropdown	Support the <pkg>x11-terms/tilda</pkg> dropdown terminal emulator

media-fonts

corefonts

Flag	Description
tahoma	Also install the Tahoma font. Due to the lack of a free bold variant, this may render badly. See bug 184790.

culmus

Flag	Description
ancient	Install ancient semitic scripts
fancy	Install fancy fonts
taamey	Install taamey fonts

fonts-meta

Flag	Description
latin	Install additional latin fonts
ms	Install (free) fonts for the "ms" preset

iosevka

Flag	Description
iosevka	Install the classic Iosevka font.
iosevka-aile	Install Iosevka Aile, a quasi-proportional sans-serif font.
iosevka-curly	Install Iosevka Curly, a curlier variant of Iosevka.
iosevka-curly-slab	Install Iosevka Curly Slab, the curly font, with slab-serifs.
iosevka-etoile	Install Iosevka Etoile, a quasi-proportional slab-serif font.
iosevka-slab	Install Iosevka Slab, a monospace slab-serif font.
iosevka-ss01	Install Iosevka SS01, an Iosevka variant made in the style of Andale Mono.
iosevka-ss02	Install Iosevka SS02, an Iosevka variant made in the style of Anonymous Pro Style.
iosevka-ss03	Install Iosevka SS03, an Iosevka variant made in the style of Consolas.
iosevka-ss04	Install Iosevka SS04, an Iosevka variant made in the style of Menlo.
iosevka-ss05	Install Iosevka SS05, an Iosevka variant made in the style of Fira Mono.
iosevka-ss06	Install Iosevka SS06, an Iosevka variant made in the style of Liberation Mono.
iosevka-ss07	Install Iosevka SS07, an Iosevka variant made in the style of Monaco.
iosevka-ss08	Install Iosevka SS08, an Iosevka variant made in the style of Pragmata Pro.
iosevka-ss09	Install Iosevka SS09, an Iosevka variant made in the style of Source Code Pro.
iosevka-ss10	Install Iosevka SS10, an Iosevka variant made in the style of Envy Code R.
iosevka-ss11	Install Iosevka SS11, an Iosevka variant made in the style of X Windows Fixed.
iosevka-ss12	Install Iosevka SS12, an Iosevka variant made in the style of Ubuntu Mono.
iosevka-ss13	Install Iosevka SS13, an Iosevka variant made in the style of Lucida.
iosevka-ss14	Install Iosevka SS14, an Iosevka variant made in the style of JetBrains Mono.
iosevka-ss15	Install Iosevka SS15, an Iosevka variant made in the style of IBM Plex Mono.
iosevka-ss16	Install Iosevka SS16, an Iosevka variant made in the style of PT Mono.
iosevka-ss17	Install Iosevka SS17, an Iosevka variant made in the style of Recursive Mono.
iosevka-ss18	Install Iosevka SS18, an Iosevka variant made in the style of Input Mono.

mplus-outline-fonts

Flag	Description
ipafont	Generates new fonts merged with <pkg>media-fonts/ja-ipafonts</pkg>

source-han-sans

Flag	Description
half-width	Select fonts with half-width
l10n_zh-HK	Chinese (Hong Kong)
language	Select fonts with language
region	Select fonts with region

terminus-font

Flag	Description
a-like-o	Changes view of letter 'a' - a looks like o (see homepage)
center-tilde	Place the '~' character vertically centered on the line instead of to the top.
distinct-l	ll2 variant with more distinctive l (lowercase L)
pcf-8bit	Install Portable Compiled Font (PCF) (X11 bitmap fonts), 8-bit encodings
pcf-unicode	Install Portable Compiled Font (PCF) (X11 bitmap fonts), Unicode encodings
psf	Install PC Screen Font (PSF) with unicode data (for linux console)
quote	Changes view of quotes: symmetric ` and ' instead of asymmetric one (see homepage)
ru-dv	Changes view of Russian letters 'de' and 've' (see homepage)
ru-g	Changes view of Russian letter 'ge' (see homepage)
ru-i	Changes view of Russian letter 'i' - not like Latin u, but like "mirrored" N (see homepage)
ru-k	Changes view of Russian letter 'k' (see homepage)

media-gfx

asymptote

Flag	Description
sigsegv	Enables using <pkg>dev-libs/libsigsegv</pkg>

blender

Flag	Description
cycles	Enable the Cycles raytracing render engine.
cycles-bin-kernels	Precompile the cycles render kernels for the CUDA/HIP/OneAPI backends, if they are enabled, at compile time. This makes it so that the user doesn't have to wait for the kernels to compile when they are used for the first time in Blender. If this option is not on, they will be built as needed at runtime.
embree	Use embree to accelerate certain areas of the Cycles render engine.
fluid	Adds fluid simulation support via the built-in Mantaflow library.
hiprt	Enable AMD HIP GPU ray tracing acceleration via <pkg>dev-libs/hiprt</pkg>.
ndof	Enable NDOF input devices (SpaceNavigator and friends).
oidn	Enable OpenImageDenoiser Support
openpgl	Enable path guiding support in Cycles
opensubdiv	Add rendering support form OpenSubdiv from Dreamworks Animation through <pkg>media-libs/opensubdiv</pkg>.
osl	Add support for OpenShadingLanguage scripting.
potrace	Add support for converting bitmaps into Grease pencil line using the potrace library.
pugixml	Enable PugiXML support (Used for OpenImageIO, Grease Pencil SVG export)

blender-bin

Flag	Description
oneapi	Enable Intel oneAPI SyCL support (computation on GPU)

darktable

Flag	Description
l10n_pt-BR	Portuguese (Brazil)
l10n_sl	Slovenian
l10n_sq	Albanian
l10n_uk	Ukrainian

digikam

Flag	Description
lensfun	Enable support for <pkg>media-libs/lensfun</pkg>
panorama	Build the panorama plugin which requires <pkg>media-gfx/hugin</pkg>

exiv2

Flag	Description
bmff	Add support for the ISOBMFF format
webready	Support reading metadata over the internet

fig2dev

Flag	Description
ghostscript	Require <pkg>app-text/ghostscript-gpl</pkg> to export PDF an bitmap formats

flameshot

Flag	Description
imgur	Enable Imgur uploader

fontforge

Flag	Description
truetype-debugger	Enable truetype debugger in fontforge
woff2	Enable support for WOFF2 format

freecad

Flag	Description
addonmgr	Build the addon manager module for automatic handling of 3rd party addons
bim	Build the BIM module and workbench
cam	Build the CAM module and workbench
fem	Build the FEM module and workbench which provides Finite Element Analysis (FEA) workflows
idf	Build the IDF module to provide file exchange capabilities with IDF files
inspection	Build the inspection workbench which gives you specific tools for examination of shapes (experimental)
openscad	Build the OpenSCAD module for interoperability with OpenSCAD and repairing Constructive Solid Geometry (CSG) history
pcl	Use external <pkg>sci-libs/pcl</pkg> for point clouds support.
points	Build the points module and workbench for working with point clouds
reverse	Build the reverse engineering module and workbench
robot	Build the robot module and workbench for studying robot movements
smesh	Build Salome SMESH
surface	Build the surface module and workbench
techdraw	Build the techdraw module and workbench, a more advanced and feature-rich successor of the drawing workbench

gimp

Flag	Description
vector-icons	Enable support for vector icons (experimental)

graphicsmagick

Flag	Description
q16	Set storage quantum size to 16 (~2*memory)

graphviz

Flag	Description
gts	Enables support for GNU Triangulated Surface Library (required for sfdp to work)
lasi	Enables PostScript output via <pkg>media-libs/lasi</pkg>, for plugin -Tlasi (needs cairo)

gthumb

Flag	Description
slideshow	Enable slideshow plugin

hugin

Flag	Description
$(echo
${LANGS//\
/\
l10n_})
sift	automatically align images with <pkg>media-gfx/autopano-sift-C</pkg>

imagemagick

Flag	Description
corefonts	Use <pkg>media-fonts/corefonts</pkg> which is required by some commands
hdri	Enable High Dynamic Range Images formats
lqr	Enable experimental liquid rescale support using <pkg>media-libs/liblqr</pkg>
q8	Set quantum depth value to 8

inkscape

Flag	Description
inkjar	Enable support for OpenOffice.org SVG jar files
svg2	Enable support for new SVG2 features

krita

Flag	Description
mypaint-brush-engine	Enable MyPaint brush engine support <pkg>media-libs/libmypaint</pkg>

openvdb

Flag	Description
"${CPU_FEATURES_ARM[@]/#/cpu_flags_arm_}"
"${CPU_FEATURES_X86[@]/#/cpu_flags_x86_}"
abi$(ver_cut-compat
abi-1-compat
abi-2-compat
abi1-compat
abi10-compat	Disables newer features to maintain compatibility with ABI10
abi11-compat	Disables newer features to maintain compatibility with ABI11
abi12-compat	Disables newer features to maintain compatibility with ABI12
abi13-compat	Disables newer features to maintain compatibility with ABI13
ax

photoqt

Flag	Description
vips	Support for <pkg>media-libs/vips</pkg> image processing library

povray

Flag	Description
io-restrictions	POV-Ray's mechanism for control of I/O operations

pstoedit

Flag	Description
pptx	Enable support for generating PowerPoint pptx files

sane-backends

Flag	Description
sane_backends_

solvespace

Flag	Description
system-mimalloc	Use system <pkg>dev-libs/mimalloc</pkg> instead of vendored library

xpaint

Flag	Description
pgf	Support for loading PGF images

media-libs

allegro

Flag	Description
physfs	Enable physfs support
vga	Enables the VGA graphics driver

avidemux-plugins

Flag	Description
aften	Enable A/52 (AC-3) audio encoder support.
dcaenc	Enable DTS Coherent Acoustics audio encoder support via <pkg>media-sound/dcaenc</pkg>.

cal3d

Flag	Description
16bit-indices	Enables use of 16bit indices

coin

Flag	Description
exceptions	Compile with C++ exceptions

dav1d

Flag	Description
8bit	Add support for decoding 8-bit AV1.

embree

Flag	Description
compact-polys	Enables double indexed poly layout.
raymask	Enables ray mask support.
tutorial	Enable to build Embree tutorials programs.

flickcurl

Flag	Description
raptor	Use <pkg>media-libs/raptor</pkg> for proper RDF serializing

freetype

Flag	Description
adobe-cff	Use Adobe CFF as default font-renderer
cleartype-hinting	Bytecode hinting mode for TrueType fonts that activates subpixel hinting (a.k.a. ClearType hinting) by default

freeverb3

Flag	Description
forcefpu	Disable assembly code
plugdouble	Build plugins in double precision mode (default is float)

ganv

Flag	Description
fdgl	Use experimental force-directed graph layout

glfw

Flag	Description
wayland-only	Enable wayland support and disable X11 support

gst-plugins-base

Flag	Description
ivorbis	Enable integer based vorbis decoder

imlib2

Flag	Description
filters	Build filter functions (blur, sharpen, etc)
packing	Enable structure packing. This will reduce memory footprint at the cost of unaligned memory access
y4m	Y4M image loader support

libafterimage

Flag	Description
shaping	Use MIT shaped X windows extention.

libbluray

Flag	Description
bdplus	Use <pkg>media-libs/libbdplus</pkg> for BD+ decryption

libde265

Flag	Description
dec265	Enable build of dec265 example program
enc265	Enable build of enc265 tool

libggi

Flag	Description
3dfx	Enables support for Voodoo chipsets, also called 3DFX and TDFX

libgphoto2

Flag	Description
adc65
agfa_cl20
aox
ax203
barbie
canon
casio_qv
clicksmart310
digigr8
digita
dimagev
dimera3500
directory
enigma13
fuji
gsmart300
hp215
iclick
jamcam
jd11
jl2005a
jl2005c
kodak_dc120
kodak_dc210
kodak_dc240
kodak_dc3200
kodak_ez200
konica
konica_qm150
largan
lg_gsm
mars
mustek
panasonic_coolshot
panasonic_dc1000
panasonic_dc1580
panasonic_l859
pccam300
pccam600
pentax
polaroid_pdc320
polaroid_pdc640
polaroid_pdc700
ptp2
ricoh
ricoh_g3
samsung
sierra
sipix_blink2
sipix_web2
smal
sonix
sony_dscf1
sony_dscf55
soundvision
spca50x
sq905
st2205
stv0674
stv0680
sx330z
topfield
toshiba_pdrm11
tp6801

libheif

Flag	Description
de265	Enable H.265 support using <pkg>media-libs/libde265</pkg>

libmypaint

Flag	Description
gegl	Add support for <pkg>media-libs/gegl</pkg>

libpano13

Flag	Description
suitesparse	Use Sparse Levenberg Marquardt algorithm instead of dense Levenberg Marquardt algorithm

libpng

Flag	Description
apng	support unofficial APNG (Animated PNG) spec

libsdl2

Flag	Description
haptic	Enable the haptic (force feedback) subsystem

libtgvoip

Flag	Description
dsp	Enable signal processing (echo cancellation, noise suppression, and automatic gain control)

libv4l

Flag	Description
tracer	Build the v4l2-tracer tool and library

libvmaf

Flag	Description
embed-models	Compile default vmaf models into the library (needs <pkg>app-editors/vim-core</pkg>)

libvpx

Flag	Description
highbitdepth	Enable 10 and 12 bit support for VP9.

libwebp

Flag	Description
swap-16bit-csp	Enable byte swapping for 16 bit colorspace

mlt

Flag	Description
rtaudio	Builds rtaudio consumer for native audio support on multiple platforms

netpbm

Flag	Description
rle	Build converters for the RLE format (utah raster toolkit)

noise-suppression-for-voice

Flag	Description
vst3	Enable the VST3 plugin

oidn

Flag	Description
openimageio	Enable OpenImageIO Support

opencolorio

Flag	Description
x86_{avx,avx2,avx512f,f16c,sse2,sse3,sse4_1,sse4_2,ssse3}

opencv

Flag	Description
atlas	Use <pkg>sci-libs/atlas</pkg> for blas, lapack and sparse blas routines (Experimental!)
contribcvv	Enable CVV in contrib
contribdnn	Enable DNN module
contribfreetype	Enable Drawing UTF-8 strings with <pkg>media-libs/freetype</pkg>&amp;<pkg>media-libs/harfbuzz</pkg>
contribhdf	Enable HDF module (requires <pkg>sci-libs/hdf5</pkg>)
contribovis	Enable OGRE vision module support (<pkg>dev-games/ogre</pkg>)
contribsfm	Enable SFM module (requires USE="eigen gflags glog")
contribxfeatures2d	Enables xfeatures2d and autodownload of samples in contrib
cpu_flags_x86_avx512_4fmaps	Use AVX-512 Fused Multiply-Accumulate Packed Single Precision instruction set
cpu_flags_x86_avx512_4vnniw	Use AVX-512 Vector Neural Network Instructions Word Variable Precision
cpu_flags_x86_avx512er	Use AVX-512 exponential and reciprocal instructions
cpu_flags_x86_avx512pf	Use AVX-512 prefetch instructions
dnnsamples	Enable dnn caffeemodel samples
features2d	Enable features2d module
glog	Use Google's C++ logging library (<pkg>dev-cpp/glog</pkg>)
jasper	Use <pkg>media-libs/jasper</pkg> for jpeg2k support
opencvapps	Enable compilation with opencvapps
spng	Use <pkg>media-libs/libspng</pkg> for png support
tesseract	Use Google's OCR Engine
wechat-qrcode	Enable wechat_qrcode module

openh264

Flag	Description
plugin	Install the Gecko Media Plugin (GMP) for use with Mozilla packages

openimageio

Flag	Description
aes
aes:aes

opus

Flag	Description
custom-modes	Enable non-Opus modes, e.g. 44.1 kHz and 2^n frames
deep-plc	Enable Deep Packet Loss Concealment (PLC)
dred	Enable Deep REDundancy (DRED)
osce	Enable Opus Speech Coding Enhancement (OSCE)

opusfile

Flag	Description
float	Enable floating point arithmetic operations

osl

Flag	Description
nofma	Do not use Fuse-Multiply-Add operations
partio	Use <pkg>media-libs/partio</pkg>

rubberband

Flag	Description
jni	Enables building of Java Native Interface library

sdl-mixer

Flag	Description
smpeg	Use <pkg>media-libs/smpeg</pkg> for MP3 support

sdl3-mixer

Flag	Description
drlibs	Use vendored dr_{flac,mp3} instead of <pkg>media-libs/flac</pkg> and/or <pkg>media-sound/mpg123-base</pkg> for those formats
libvorbis	Use <pkg>media-libs/libvorbis</pkg> for OGG Vorbis support

sdl3-ttf

Flag	Description
plutosvg	Use <pkg>media-libs/plutosvg</pkg> for colour emoji support

speex

Flag	Description
cpu_flags_arm_v4	Use instructions added in ARMv4
cpu_flags_arm_v5	Use instructions added in ARMv5
cpu_flags_arm_v6	Use instructions added in ARMv6
vbr	Enable VBR support.

svt-av1

Flag	Description
cpu_flags_x86_avx512vl	Use AVX-512 vector-length instructions

tremor

Flag	Description
low-accuracy	enable 32bit only multiply operations

vips

Flag	Description
highway	Enable SIMD optimizations using <pkg>dev-cpp/highway</pkg> (replaces USE=orc)

virglrenderer

Flag	Description
venus	Enable Venus Virtio-GPU protocol
video_cards_asahi	VIDEO_CARDS setting to build support for Apple AGX GPUs

vulkan-loader

Flag	Description
layers	Include the vulkan layers

x265

Flag	Description
12bit	Add support for producing 12bits HEVC.

media-plugins

alsa-plugins

Flag	Description
arcam_av	Enables Arcam AV control plugin
mix	Enables upmix and vdownmix plugin
usb_stream	Enables usb_stream plugin

audacious-plugins

Flag	Description
ampache	Support controlling audacious via ampache
scrobbler	Build with scrobbler/LastFM submission support
streamtuner	Build the streamtuner plugin

frei0r-plugins

Flag	Description
facedetect	Enables building of facedetect plugin, which depends on <pkg>media-libs/opencv</pkg>
scale0tilt	Enables building of scale0tilt and vectorscope plugins, which depend on <pkg>media-libs/gavl</pkg>

grilo-plugins

Flag	Description
flickr	Enable Flickr support
freebox	Build support for viewing TV channels using Freebox
thetvdb	Build support for thetvdb.com
youtube	Build support for YouTube content discovery using <pkg>dev-libs/libgdata</pkg>

photoqt-extensions

Flag	Description
histogram	Support histogram using <pkg>dev-qt/qtcharts</pkg>

vdr-epgsearch

Flag	Description
conflictcheckonly	install the "conflictcheckonly" vdr-plugin
epgsearchonly	install the "epgsearchonly" vdr-plugin
quicksearch	install the "quicksearch" vdr-plugin

media-radio

xastir

Flag	Description
geotiff	Install geotiff support. Allows using USGS DRG topo maps or other types of geotiff mapes/images

media-sound

abcde

Flag	Description
aiff	Enable support for Audio Interchange File Format (AIFF) output encoding

alsa-tools

Flag	Description
alsa_cards_emu10k1x	Emu10k1X (Dell OEM Version)
alsa_cards_ice1712	ICEnsemble ICE1712 (Envy24)
alsa_cards_rme32	RME Digi32, 32/8, 32 PRO
alsa_cards_rme96	RME Digi96, 96/8, 96/8 PRO
alsa_cards_sbawe	Sound Blaster AWE (32,64) (PnP)
alsa_cards_sscape	Ensoniq SoundScape PnP driver

alsa-utils

Flag	Description
bat	install basic audio tester (BAT) util

aqualung

Flag	Description
ifp	Enable support for iRiver iFP portable audio players

ardour

Flag	Description
cpu_flags_x86_{avx,avx512f,fma3,sse}
phonehome	contact ardour.org at startup for new announcements

ario

Flag	Description
idle	Enable experimental support for MPD's idle command to reduce bandwidth and cpu usage, requires MPD 0.14

audacity

Flag	Description
audiocom	Enable integrated uploading to audio.com
portmixer	Enable the internal portmixer feature
sbsms	Enable slower, more accurate pitch and tempo changing via <pkg>media-libs/libsbsms</pkg>

audiotools

Flag	Description
dvda	Enable DVD-Audio support

bluez-alsa

Flag	Description
hcitop	Enable top-like monitoring tool for HCI
msbc	Enable mSBC audio support for HFP

csound

Flag	Description
beats	Build the beats score frontend

deadbeef

Flag	Description
converter	File format converter
hotkeys	Keyboard shortcuts support
nullout	Dummy output driver
sc68	Atari ST and Amiga music player
shellexec	Define custom shell commands that can be called on tracks
supereq	Enable equalizer

denemo

Flag	Description
aubio	Enable <pkg>media-libs/aubio</pkg> support

dir2ogg

Flag	Description
wma	Add support for wma files through mplayer

easyeffects

Flag	Description
mda-lv2	Enable use of <pkg>media-plugins/mda-lv2</pkg> for the loudness FX

ecasound

Flag	Description
oil	Use <pkg>dev-libs/liboil</pkg> for inner loop optimizations

fapg

Flag	Description
xspf	Enable support for saving XSPF playlists.

gimmix

Flag	Description
lyrics	Enable lyric fetching

gogglesmm

Flag	Description
dca	Enable support for DTS Coherent Acoustics via <pkg>media-libs/libdca</pkg>

jack-example-tools

Flag	Description
jack-net	Build jack_net_* example clients
jack-netsource	Build jack_netsource for configuring network sources
zalsa	Build the zalsa internal client using <pkg>media-libs/zita-resampler</pkg>

jack2

Flag	Description
metadata	Enable metadata API

lame

Flag	Description
mp3rtp	Build the mp3-to-RTP streaming utility. **UNSUPPORTED**

linuxsampler

Flag	Description
sf2	Add support for SoundFont 2 sound bank files

mixxx

Flag	Description
keyfinder	Enable musical key detection support via <pkg>media-libs/libkeyfinder</pkg>
qtkeychain	Enable Secure credential storage support via <pkg>dev-libs/qtkeychain</pkg>

mpd

Flag	Description
libmpdclient	Enable support for remote mpd databases
qobuz	Build plugin to access qobuz
signalfd	Use the signalfd function in MPD's event loop
snapcast	Snapcast audio plugin

ncmpc

Flag	Description
async-connect	Enable asynchronous connect
chat-screen	Enable the chat screen
colors	Enable color output
help-screen	Enable the help screen
key-screen	Enable key editor screen
library-screen	Enable library screen
lyrics-screen	Enable lyrics screen
outputs-screen	Enable the outputs screen
search-screen	Enable search screen
song-screen	Enable song viewer screen

ncmpcpp

Flag	Description
outputs	Enable outputs screen
visualizer	Enable visualizer screen with sound wave/frequency spectrum modes

patchage

Flag	Description
jack-dbus	Use Jack via D-Bus instead of libjack

picard

Flag	Description
fingerprints	Enable calculation and lookup of AcoustID fingerprints

puddletag

Flag	Description
quodlibet	Enables support for editing <pkg>media-sound/quodlibet</pkg> databases

pulseaudio-daemon

Flag	Description
alsa-plugin	Request installing <pkg>media-plugins/alsa-plugins</pkg> with PulseAudio plugin enabled. This ensures that clients supporting ALSA only will use PulseAudio.
equalizer	Enable the equalizer module (requires <pkg>sci-libs/fftw</pkg> and <pkg>sys-apps/dbus</pkg>).
ofono-headset	Build with optional oFono HFP backend for bluez 5, requires <pkg>net-misc/ofono</pkg>.
system-wide	Allow preparation and installation of the system-wide init script for PulseAudio. Since this support is only supported for embedded situations, do not enable without reading the upstream instructions at https://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/User/WhatIsWrongWithSystemWide/ .
webrtc-aec	Uses the webrtc.org AudioProcessing library for enhancing VoIP calls greatly in applications that support it by performing acoustic echo cancellation, analog gain control, noise suppression and other processing.

qmmp

Flag	Description
libxmp	Enable module files renderer (modplug replacement) via <pkg>media-libs/libxmp</pkg>

qsampler

Flag	Description
libgig	Enable libgig support for loading Gigasampler files and DLS (Downloadable Sounds) Level 1/2 files

shntool

Flag	Description
alac	Add support for Apple Lossless Audio Codec files
shorten	Add support for the shorten audio compressor

snd

Flag	Description
notcurses	Terminal interface via <pkg>dev-cpp/notcurses</pkg>
s7	Enable the s7 extension language (a version of Scheme)

sox

Flag	Description
dolbyb	Support Dolby B like noise reduction with <pkg>media-libs/libdolbyb</pkg>
speexdsp	Support for automatic gain control, denoise and dereverb with <pkg>media-libs/speexdsp</pkg>

split2flac

Flag	Description
flake	Add support for Flake, alternative FLAC encoder

spotify

Flag	Description
local-playback	Allows playing local files with the Spotify client

strawberry

Flag	Description
moodbar	Enable moodbar support

supercollider

Flag	Description
ableton-link	Enable support for Ableton Link
gpl3	Build GPL-3 licensed code (recommended)

teamspeak-server

Flag	Description
tsdns	Install TeamSpeaks own DNS service for handling multiple virtual servers.

upmpdcli

Flag	Description
thirdparty	Enable streaming from Qobuz and Tidal external services

vorbis-tools

Flag	Description
ogg123	Build ogg123 player, needs libao and curl

xmms2

Flag	Description
:asx
:cue
:diskwrite
:launcher
aac:faad
cxx:xmmsclient++,xmmsclient++-glib
ices	Icecast source output plugin
mlib-update	Enable building of xmms2-mlib-updater client

xwax

Flag	Description
fallback	Sets runtime dependencies to support decoding "other" audio files.

media-tv

kodi

Flag	Description
eventclients	Install full set of Kodi python eventclients and eventclients examples
optical	Enable Audio CD playback, optical disks detection and reading (CD-ROM, Video CD, and others), and ISO optical disk images direct reading. DVD disks may require additional 'udf' flag.
udf	Enable UDF support. Required for playing blurays.

linuxtv-dvb-apps

Flag	Description
alevt	Build videotext decoder

mythtv

Flag	Description
asi	Support for DVEO ASI recorder
ceton	Ceton InfiniTV 4 a CableCARD-enabled tuner support
lcd	Enable use of <pkg>app-misc/lcdproc</pkg> data display
vbox	V@Box Communications network-attached tuner devices support

tvheadend

Flag	Description
ddci	Enable support for DDCI hardware
imagecache	Enable support for image caching
iptv	Enable support for Internet Protocol TV
satip	Enable support for IP-based Satellite TV
timeshift	Enable TimeShift support
uriparser	Use <pkg>dev-libs/uriparser</pkg>

xmltv

Flag	Description
ch-search	Grabber for Switzerland
eu-epgdata	include fanart URLs for some European countries.
eu-xmltvse	Grabbber for Europe [replaces eu-dotmedia and se-tvzon]
fi-sv	Grabber for Finland (Swedish)
huro	Hungarian tv listing grabber
is	Iceland tv listing grabber
it-dvb	Italy tv listing grabber
na-dd	North America tv listing grabber
na-dtv	North America Direct TV grabber
na-tvmedia	Grabber for North America (TVMedia)
pt-vodafone	Grabber for Portugal (Vodafone)
tv-check	enable GUI checking
tv-combiner	enable grabbers combiner
tv-pick-cgi	enable CGI support
uk-tvguide	UK and Ireland tv listing grabber using TV Guide website
zz-sdjson	Grabber for schedulesDirect.org SD-JSON service (many countries)
zz-sdjson-sqlite	Grabber for schedulesDirect.org SD-JSON service (sqlite DB)

media-video

amdgpu-pro-amf

Flag	Description
pro	Pull media-libs/amdgpu-pro-vulkan as dependency
radv	Pull media-libs/mesa as dependency

aravis

Flag	Description
fast-heartbeat	Enable faster heartbeat rate.
packet-socket	Enable packet socket support.

ffmpeg

Flag	Description
opencolorio	Enable use of color management filters via <pkg>media-libs/opencolorio</pkg>
rist	Enable Reliable Internet Stream Transport (RIST) protocol support via <pkg>net-libs/librist</pkg>

guvcview

Flag	Description
sfml	Build with SFML X11-engine instead of sdl

libva-utils

Flag	Description
putsurface	Build and install putsurface tool.
vainfo	Build and install vainfo tool.

mjpegtools

Flag	Description
sdlgfx	Enables y4mhist to display a graphical histogram

mjpg-streamer

Flag	Description
http-management	Enable experimental HTTP management option
input-control	Plugin giving ability to control camera movement (only specific cameras)
input-file	Plugin that watches given directory and send it's content
input-http	Plugin that takes http-input
input-ptp2	Plugin that sends video stream from PTP2 compatible camera
input-testpicture	Plugin for sending compiled in, test pictures
input-uvc	Plugin that sends video stream from UVC compatible camera
output-autofocus	Auto focusing plugin
output-file	Plugin that saves received content under given location
output-http	Small HTTP server plugin which sends WWW directory content and streams image content
output-rtsp	Plugin which provides a mechanism to take snapshots with a trigger from a UDP packet
output-udp	Plugin receiving content over UDP and storing to a directory
output-viewer	Plugin which allows to see output with viewer
output-zmqserver	Plugin which provides zmqserver processing
www	Installs WWW content
wxp-compat	Enable camera WXP compatible format

motiontrack

Flag	Description
multiprocess	Enables multi-process support (SMP/cluster) for motiontrack programs

mplayer

Flag	Description
bl	Blinkenlights video output
cpu_flags_arm_iwmmxt	Use the iwMMXt instruction set
cpu_flags_arm_vfp	Use the VFP version 2 instruction set
cpu_flags_arm_vfpv3	Use the VFP version 3 instruction set
dvdnav	Use forked libdvdnav, navigate menus in GUIs
md5sum	Enables md5sum video output
osdmenu	Enables support for on-screen display (OSD) menus
pnm	Add PNM video output option, to create PPM/PGM/PGMYUV images
pvr	Enable Video4Linux2 MPEG PVR
radio	Enable V4L2 radio interface and support
toolame	Enable toolame MPEG-2 encoding
yuv4mpeg	Enables yuv4mpeg video output
zoran	Enables ZR360[56]7/ZR36060 video output

mpv

Flag	Description
subrandr	Enable support for SRV3 and WebVTT subtitle formats using <pkg>media-libs/subrandr</pkg>

obs-studio

Flag	Description
decklink	Build the Decklink plugin.
mpegts	Enable native SRT/RIST mpegts output.
test-input	Build and install input sources used for testing.

pipewire

Flag	Description
echo-cancel	Enable WebRTC-based echo canceller via <pkg>media-libs/webrtc-audio-processing</pkg>
jack-client	Install a plugin for running PipeWire as a JACK client
jack-sdk	Use PipeWire as JACK replacement
libcamera	Enable libcamera plugin via <pkg>media-libs/libcamera</pkg>
pipewire-alsa	Install ALSA plugin, similar to <pkg>media-plugins/alsa-plugins</pkg>'s USE=pulseaudio.
roc	Enable roc support for real-time audio streaming over the network, using <pkg>media-libs/roc-toolkit</pkg>. See https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Network#roc
sofa	Spatially Oriented Format for Acoustics (SOFA) support via <pkg>media-libs/libmysofa</pkg>
sound-server	Provide sound server using ALSA and bluetooth devices

qmplay2

Flag	Description
audiofilters	Build with AudioFilters module
avdevice	Build FFmpeg module with libavdevice suport
cuvid	Build with CUVID module
inputs	Build with Inputs module
libopenmpt	Build with OpenMPT support
notifications	Build additional notifications module
shaders	Compile Vulkan shaders using <pkg>media-libs/shaderc</pkg>
videofilters	Build with VideoFilters module
visualizations	Build with Visualizations module

rav1e

Flag	Description
capi	Build the C-API library and header file

srs

Flag	Description
h265	Enable H.265 support
signal-api	Enable Signal-API

vdr

Flag	Description
demoplugins	Install demo and example plugins coming with vanilla vdr
menuorg	Enables support for the <pkg>media-plugins/vdr-menuorg</pkg>
naludump	Removes NALU fill data from h.264-Streams of TS files
permashift	permanent timeshift by recording live TV into RAM, need plugin <pkg>media-plugins/vdr-permashift</pkg>
pinplugin	Support for <pkg>media-plugins/vdr-pin</pkg>
ttxtsubs	support for <pkg>media-plugins/vdr-ttxtsubs</pkg>
verbose	enable full output on compile

vlc

Flag	Description
aribsub	Enable support for decoding ARIB STD-B24 subtitles
dc1394	Enable IIDC cameras support
directx	Enable Win32 DirectX, D3D11va and DxVA2 support
dvbpsi	Enable support for Mpeg-TS files (.ts, .m2ts, .mts) via <pkg>media-libs/libdvbpsi</pkg>
libtiger	Enable Ogg Kate subtitles rendering using libtiger
linsys	Enable support for Linux Linear Systems Ltd. SDI and HD-SDI input cards
macosx-notifications	Enable Mac OS X notifications module (formerly growl)
omxil	Enable OpenMAX Integration Layer codec module
run-as-root	Allows vlc to start for root. Don't enable this unless you have a very specific (e.g. embedded) need for it!
skins	Enable support for the skins2 interface

webcamoid

Flag	Description
fdk-aac	Enable <pkg>media-libs/fdk-aac</pkg> audio codec support
headers	Install development headers
libuvc	Enable video capturing from USB devices using <pkg>media-libs/libuvc</pkg>

x264-encoder

Flag	Description
avs	enable AvxSynth support in the AviSynth input module
ffmpegsource	Enable ffmpegsource aka ffms support, disables lavf

net-analyzer

argus-clients

Flag	Description
ft	Enable support for flow packets through <pkg>net-analyzer/flow-tools</pkg>

barnyard2

Flag	Description
mpls	Enable support for mpls networks

bwm-ng

Flag	Description
csv	Enable csv output

fprobe

Flag	Description
messages	enable console messages

goaccess

Flag	Description
getline	Use GNU getline() to parse full line requests

gvm

Flag	Description
gsa	Greenbone Security Assistant (WebUI)
ospd	Enable support for scanner wrappers

icinga2

Flag	Description
opentelemetry	Enable support for exporting to opentelemetry compatible backends

ipsumdump

Flag	Description
nanotimestamp	Enable timestamps with nano-second resolution

monitoring-plugins

Flag	Description
fping	Install <pkg>net-analyzer/fping</pkg> required for fancy ping monitoring. Disabling the flag does not remove any plugins.

mtr

Flag	Description
ipinfo	Disable support for IP address lookups

munin

Flag	Description
dhcpd	Install <pkg>dev-perl/Net-IP</pkg>, <pkg>dev-perl/HTTP-Date</pkg> and <pkg>net-misc/dhcp</pkg> to monitor DHCP lease usage. This only works if the server is on the same system as the node, so the server is also brought in. Disabling the flag does not remove any plugin file.

nagios-core

Flag	Description
classicui	use the classic web theme

nagios-plugin-check_raid

Flag	Description
3ware	Support 3ware RAID controllers
aacraid	Support Adaptec AAC-RAID controllers
dmraid	Support Device-Mapper RAID
hpa	Support HP Array controllers
hpsa	Support HP SmartArray (CCISS) controllers
megaraid-sas	Support LSI MegaRAID SAS controllers
mpt	Support LSI MPT Fusion controllers
mpt-sas2	Support LSI SAS-2 controllers

nagios-plugins

Flag	Description
nagios-dns	Install <pkg>net-dns/bind</pkg> required for monitoring DNS servers. Disabling the flag does not remove any plugin file.
nagios-game	Install <pkg>games-util/qstat</pkg> required for monitoring FPS servers. Disabling the flag does not remove any plugin file.
nagios-ping	Install <pkg>net-analyzer/fping</pkg> required for fancy ping monitoring. Disabling the flag does not remove any plugin file.

net-snmp

Flag	Description
mfd-rewrites	Use MFD rewrites of mib modules where available
smux	Enable support for the legacy smux protocol (superseded by agentx)
ucd-compat	Build UCD compatibility library. Increases significantly the install size.

netdata

Flag	Description
aclk	Enable Agent-Cloud Link (ACLK) for securely connecting a Netdata Agent to your web browser through Netdata Cloud
dbengine	Enable the Netdata database engine
nodejs	Enable use of nodejs (which some plugins use)

nfdump

Flag	Description
ftconv	Build the flow-tools to nfdump converter
jnat	Build nfudmp to support JunOS NAT event logging
nfpcapd	Build nfpcapd collector to create netflow data from precollected pcap traffic
nfprofile	Build nfprofile used by NfSen
nftrack	Build nfprofile used by PortTracker
nsel	Build nfudmp to support NSEL/NEL event data
readpcap	Build nfcapd collector to read from pcap file instead ofnetwork data
sflow	Build sflow collector sfcpad

nmap

Flag	Description
ncat	Install the ncat utility
ndiff	Install the ndiff utility
nping	Install the nping utility
nse	Include support for the Nmap Scripting Engine (NSE)
zenmap	Install the GTK+ based nmap GUI, zenmap

nrpe

Flag	Description
command-args	Build support for specifying the command-line arguments from the Nagios/Icinga master. Make sure you understand the implications of this flag as it can be a security risk.

ospd-openvas

Flag	Description
notus	Set systemd service file to use notus-scanner

pmacct

Flag	Description
bgp-bins	Link BGP daemon binaries
bmp-bins	Link BMP daemon binaries
l2	Enable Layer-2 features and support
ndpi	Enable support for nDPI through <pkg>net-libs/nDPI</pkg>
st-bins	Link Streaming Telemetry daemon binaries
traffic-bins	Link IPv4/IPv6 traffic accounting binaries

pnp4nagios

Flag	Description
icinga	Build against <pkg>net-analyzer/icinga2</pkg> instead of <pkg>net-analyzer/nagios-core</pkg>

rrdcollect

Flag	Description
librrd	Use the librrd library from <pkg>net-analyzer/rrdtool</pkg>

rrdtool

Flag	Description
rados	Enable support for librados from <pkg>sys-cluster/ceph</pkg>
rrdcached	Build support for write-caching daemon
rrdcgi	Build rrdcgi support

rustscan

Flag	Description
nmap	Installs <pkg>net-analyzer/nmap</pkg>

sarg

Flag	Description
doublecheck	Make sarg double check the data it manipulates and output a warning if an error is found
glob	Disable to ignore wildcards in file names

scanlogd

Flag	Description
nids	Use <pkg>net-libs/libnids</pkg> for packet capturing

sngrep

Flag	Description
eep	Enable EEP packet send/receive support

snort

Flag	Description
active-response	Enables support for automatically sending TCP resets and ICMP unreachable messages to terminate connections. Used with inline deployments.
file-inspect	Enables extended file inspection capabilities.
flexresp3	Enables support for new flexable response preprocessor for enabling connection tearing for inline deployments. Replaces flexresp and flexresp2.
high-availability	Enables high-availability state sharing.
inline-init-failopen	Enables support to allow traffic to pass (fail-open) through inline deployments while snort is starting and not ready to begin inspecting traffic. If this option is not enabled, network traffic will not pass (fail-closed) until snort has fully started and is ready to perform packet inspection.
large-pcap-64bit	Allows Snort to read pcap files that are larger than 2 GB. ONLY VALID FOR 64bit SYSTEMS!
linux-smp-stats	Enable accurate statistics reporting through /proc on systems with multiple processors.
non-ether-decoders	Enable decoding of non-ethernet protocols such as TokenRing, FDDI, IPX, etc.
open-appid	Enable OpenAppID, an open, application-focused detection language and processing module for Snort that enables users to create, share, and implement application detection. Requires <pkg>dev-lang/luajit</pkg>.
perfprofiling	Enables support for preprocessor and rule performance profiling using the perfmonitor preprocessor.
ppm	Enables support for setting per rule or per packet latency limits. Helps protect against introducing network latency with inline deployments.
react	Enables support for the react rule keyword. Supports interception, termination, and redirection of HTTP connections.
reload-error-restart	Enables support for completely restarting snort if an error is detected during a reload.
shared-rep	Enables the use of shared memory for the Reputation Preprocessor (Only available on Linux systems)
side-channel	Enables Snort's side channel.
sourcefire	Enables Sourcefire specific build options, which include --enable-perfprofiling and --enable-ppm.

suricata

Flag	Description
af-packet	Enable AF_PACKET support
detection	Enable detection modules

symon

Flag	Description
symon	Enables the system monitor. Offers no functionality but monitoring and forwarding of measured data
symux	Enables the multiplexer which stores incoming symon streams on disk in RRD (<pkg>net-analyzer/rrdtool</pkg>) files

testssl

Flag	Description
bundled-openssl	Install precompiled versions of OpenSSL for greater testing coverage

tracebox

Flag	Description
sniffer	Build the sniffer component using <pkg>net-libs/libnetfilter_queue</pkg>

wireshark

Flag	Description
androiddump	Install androiddump, an extcap interface to capture from Android devices
bcg729	Use <pkg>media-libs/bcg729</pkg> for G.729 codec support in RTP Player
capinfos	Install capinfos, to print information about capture files
captype	Install captype, to print the file types of capture files
ciscodump	Install ciscodump, extcap interface to capture from a remote Cisco router
dftest	Install dftest, to display filter byte-code, for debugging dfilter routines
dpauxmon	Install dpauxmon, an external capture interface (extcap) that captures DisplayPort AUX channel data from linux kernel drivers
dumpcap	Install dumpcap, to dump network traffic from inside wireshark
editcap	Install editcap, to edit and/or translate the format of capture files
mergecap	Install mergecap, to merge two or more capture files into one
randpkt	Install randpkt, a utility for creating pcap trace files full of random packets
randpktdump	Install randpktdump, an extcap interface to provide access to the random packet generator (randpkt)
reordercap	Install reordercap, to reorder input file by timestamp into output file
sbc	Use <pkg>media-libs/sbc</pkg> for playing back SBC encoded packets
sdjournal	Install sdjournal, an extcap that captures systemd journal entries
sharkd	Install sharkd, the daemon variant of wireshark
sshdump	Install sshdump, an extcap interface to capture from a remote host through SSH
text2pcap	Install text2pcap, to generate a capture file from an ASCII hexdump of packets
tshark	Install tshark, to dump and analyzer network traffic from the command line
udpdump	Install udpdump, to get packets exported from a source (like a network device or a GSMTAP producer) that are dumped to a pcap file

zabbix

Flag	Description
agent2	Enable go-based zabbix agent 2 (for to-be-monitored machines)

net-dialup

accel-ppp

Flag	Description
ipoe	Build IPoE kernel module

mgetty

Flag	Description
fidonet	Enables FidoNet support

ppp

Flag	Description
activefilter	Enables active filter support

net-dns

avahi

Flag	Description
autoipd	Build and install the IPv4LL (RFC3927) network address configuration daemon
bookmarks	Install the avahi-bookmarks application (requires <pkg>dev-python/twisted</pkg>)
howl-compat	Enable compat libraries for howl
mdnsresponder-compat	Enable compat libraries for mDNSResponder

bind

Flag	Description
fixed-rrset	Enables fixed rrset-order option

dnscap

Flag	Description
cryptopant	Enable cryptopANT plugin, implementation of crypto-PAn algorithm using <pkg>app-crypt/cryptopant</pkg> to anonymize IP addresses

dnsdist

Flag	Description
doh3	Enable support for dns over http3 via <pkg>net-libs/quiche</pkg>
ipcipher	Enable support for ipcipher via <pkg>dev-libs/openssl</pkg>
ipcrypt	Enable support for encryption/decryption of IP addresses via IPCrypt

dnsmasq

Flag	Description
auth-dns	Add support for acting as an authorative DNS server.
dhcp-tools	Install extra command line tools for manually managing DHCP leases.
dumpfile	Include code to dump packets to a libpcap-format file for debugging
libidn2	Enable support for Internationalized Domain Names, via <pkg>net-dns/libidn2</pkg> rather than <pkg>net-dns/libidn</pkg>
loop	Include functionality to probe for and remove DNS forwarding loops
nettlehash	Use hashing functions from <pkg>dev-libs/nettle</pkg>
script	Enable support for calling scripts when leases change.

dnssec-validator

Flag	Description
dlv	Enable support for the DNSSEC look-aside validation

getdns

Flag	Description
getdns-query	Add getdns_query tool
getdns-server-mon	Add getdns_server_mon tool
stubby	Add Stubby DNS Privacy Deamon

hash-slinger

Flag	Description
ipsec	Enable support for IPSECKEY records (ipseckey)
openpgp	Enable support for OPENPGPKEY records (openpgpkey)

idnkit

Flag	Description
liteonly	Compile and install lite library only

knot

Flag	Description
"dnstap"
"geoip"
fastparser	Use a zone file parser that is faster, but requires more memory and CPU time to compile

knot-resolver

Flag	Description
kresc	Build (experimental) command-line client
manager	Manager is a user-friendly interface and a component handling rolling restarts, config update logic and more
nghttp2	DNS-over-HTTPS support

nsd

Flag	Description
bind8-stats	Enables BIND8 like NSTATS and XSTATS and statistics in nsd-control
memclean	Cleanup memory (at exit) for eg. valgrind, memcheck
minimal-responses	If minimal responses are disabled, responses are more likely to get truncated, resulting in TCP fallback
radix-tree	Use a radix tree for main lookups instead of a red-black tree
ratelimit	Enables ratelimiting, based on query name, type and source
recvmmsg	Enable recvmmsg and sendmmsg compilation, faster but some kernel versions may have implementation problems for IPv6
simdzone	Leverage SIMD instructions in modern CPUs to improve throughput

opendnssec

Flag	Description
external-hsm	Enables support for storing DNSSEC keys through an arbitrary non-portage PKCS#11 interface, specified through an environment variable
opensc	Enables support for storing DNSSEC keys through a <pkg>dev-libs/opensc</pkg> PKCS#11 interface
signer	Enables signing capabilities for OpenDNSSEC
softhsm	Enables support for storing DNSSEC keys in a <pkg>dev-libs/softhsm</pkg> PKCS#11 object

pdns

Flag	Description
lua-records	Enable LUA records.
tinydns	Use a TinyDNS CDB database as backend.

unbound

Flag	Description
ecdsa	Enable ECDSA support
ecs	Enable EDNS client subnet support

net-firewall

conntrack-tools

Flag	Description
cthelper	Use <pkg>net-libs/libnetfilter_cthelper</pkg> for userspace conntrack helper support
cttimeout	Use <pkg>net-libs/libnetfilter_cttimeout</pkg> for conntrack timeout support

firehol

Flag	Description
ipset	Use <pkg>net-firewall/ipset</pkg>.

fwknop

Flag	Description
udp-server	Enable UDP-only server mode (no <pkg>net-libs/libpcap</pkg> dependency)

ipt_netflow

Flag	Description
natevents	Netflow NAT translation events (NEL) support

nftables

Flag	Description
xtables	Add libxtables support to try to automatically translate rules added by iptables-compat

shorewall

Flag	Description
init	Adds the capability to place the firewall in a safe state prior to bringing up the network interfaces
ipv4	Installs everything needed to create a full IPv4 firewall
lite4	Installs everything needed to just *run* an IPv4 compiled firewall script created with <pkg>net-firewall/shorewall</pkg> ipv4 USE flag
lite6	Installs everything needed to just *run* an IPv6 compiled firewall script created with <pkg>net-firewall/shorewall</pkg> ipv6 USE flag

xtables-addons

Flag	Description
account
asn
chaos
condition
delude
dhcpmac
dnetmap
echo
fuzzy
gradm
iface
ipmark
ipp2p
ipv4options
length2
logmark
lscan
pknock
proto
quota2
sysrq
tarpit

net-fs

autofs

Flag	Description
mount-locking	Enable locking to prevent corruption of /etc/mtab in the presence of concurrent auto-mounting. If enabled, recursive auto-mounting (eg. using autofs to bind or loop mount a filesystem which is itself auto-mounted) is not possible.

cifs-utils

Flag	Description
creds	cifs credentials support

nfs-utils

Flag	Description
junction	Enable NFS junction support in nfsref
nfsdctl	Build 'nfsdctl' utility to control nfsd.
nfsv3	Enable support for NFSv2 and NFSv3

openafs

Flag	Description
bitmap-later	Enable fast startup of file server by not reading bitmap till needed.
kauth	Install the DEPRECATED kauth server, PAM modules, and utilities
namei	Enable namei fileserver instead of inode fileserver. You should disable this option only if compatibility with inode format AFS storage is required.
pthreaded-ubik	Enable installation of pthreaded ubik applications.
supergroups	Enable support for nested pts groups.
tsm	Enable use of the Tivoli TSM API libraries from <pkg>app-backup/tsm</pkg> for butc support. AMD64 only.
ubik-read-while-write	Enable vlserver read from db cache during write locks (EXPERIMENTAL)

samba

Flag	Description
addc	Enable Active Directory Domain Controller support
iprint	Enabling iPrint technology by Novell
profiling-data	Enables support for collecting profiling data
regedit	Enable support for regedit command-line tool
snapper	Enable vfs_snapper module (requires <pkg>sys-apps/dbus</pkg>)
spotlight	Enable support for spotlight backend
system-heimdal	Use <pkg>app-crypt/heimdal</pkg> instead of bundled heimdal.
system-mitkrb5	Use <pkg>app-crypt/mit-krb5</pkg> instead of <pkg>app-crypt/heimdal</pkg>.
winbind	Enables support for the winbind auth daemon

net-ftp

frox

Flag	Description
transparent	Enable transparent proxying of data connections

lftp

Flag	Description
convert-mozilla-cookies	Install the convert-mozilla-cookies script and its run-time dependencies
verify-file	Install the verify-file script and its run-time dependencies

proftpd

Flag	Description
authfile	Enable support for the auth-file module
ban	Enable support for the mod_ban module
case	Enable support for the mod_case module
copy	Enable support for the mod_copy module
ctrls	Enable support for the mod_ctrls and mod_ctrls_admin modules
deflate	Enable support for the mod_deflate module
diskuse	Enable support for the mod_diskuse module
dso	Enable support for the mod_dso module
dynmasq	Enable support for the mod_dynmasq module, for dynamically updating MasqueradeAddress for dyndns-like scenarios)
ifsession	Enable support for the ifsession module
ifversion	Enable support for the mod_ifversion module
log-forensic	Enable support for the mod_log_forensic module, log only suspicious actions.
memcache	Enable support for the mod_memcache module, for using memcached servers
msg	Enable support for the mod_msg module, allows system users to send messages to connected clients via the ftpdctl program.
ratio	Enable support for the mod_ratio module
readme	Enable support for the mod_readme module
rewrite	Enable support for the rewrite module
sitemisc	Enable support for the sitemisc module
softquota	Enable support for the quotatab module
unique-id	Enable support for the mod_unique_id module, every connection gets unique ID.
vroot	Enable support for the virtual root module

pure-ftpd

Flag	Description
anondel	Permit anonymous to delete files
anonperm	Permit anonymous to change file permissions
anonren	Permit anonymous to rename files
anonres	Permit anonymous to resume file transfers
implicittls	Enable TLS on Port 990
noiplog	Disables logging of IP addresses
paranoidmsg	Display paranoid messages instead of normal ones
resolveids	Resolve UIDs/GIDs
sysquota	Enables system quota support (needs <pkg>sys-fs/quota</pkg>)
vchroot	Enable support for virtual chroot (possible security risk)

net-im

biboumi

Flag	Description
udns	Asynchronously resolve domain names using <pkg>net-libs/udns</pkg>

bitlbee

Flag	Description
twitter	Enable Twitter protocol support

dino

Flag	Description
notification-sound	notification sounds plugin
rtp	Enable Audio/Video calls over XMPP using RTP

ejabberd

Flag	Description
captcha	Support for CAPTCHA Forms (XEP-158) on registration
full-xml	Use XML features in XMPP stream (ex: CDATA), requires XML compliant clients
roster-gw	Turn on workaround for processing gateway subscriptions
sip	Enable SIP support
stun	Enable STUN/TURN support

pidgin

Flag	Description
gadu	Enable Gadu Gadu protocol support
groupwise	Enable Novell Groupwise protocol support
meanwhile	Enable meanwhile support for Sametime protocol
prediction	Enable Contact Availability Prediction plugin
zephyr	Enable Zephyr protocol support

profanity

Flag	Description
omemo-qrcode	Enable exchanging OMEMO information via QR code

qtox

Flag	Description
spellcheck	Enable spell checking support

spectrum2

Flag	Description
frotz	Enables the Z-Engine backend.

toxic

Flag	Description
audio-notify	Enables native sound notifications

zoom

Flag	Description
zoom-symlink	Install a zoom symlink in /usr/bin

net-irc

atheme-services

Flag	Description
largenet	Enable support/tweaks for large networks

hexchat

Flag	Description
plugin-checksum	Build Checksum plugin (needs plugins)
plugin-fishlim	Build FiSHLiM plugin (needs plugins )
plugin-sysinfo	Build SysInfo plugin (needs plugins)
theme-manager	Build the theme manager (mono)

inspircd

Flag	Description
log-json	Enable logging via JSON
regex-posix	Add support for POSIX Regular Expressions
sslrehashsignal	Enable rehashing SSL module by SIGUSR1

iroffer-dinoex

Flag	Description
memsave	Compile with memory protection

ngircd

Flag	Description
irc-plus	Enables support for the IRC+ protocol (needs <pkg>virtual/libiconv</pkg>)
strict-rfc	Strict RFC compliance; may harm compatibility

psybnc

Flag	Description
multinetwork	Adds support for multiple networks
oidentd	Adds support for oidentd

quassel

Flag	Description
monolithic	Build standalone client with integrated core, no external quasselcore needed. Only useful if you don't want to use Quassel's client/server model. The server and X flags are not needed in this case but it is possible to enable them too.
oxygen	Support the Oxygen icon set that was the default for KDE4.
system-icons	Use <pkg>kde-frameworks/breeze-icons</pkg> rather than icons bundled with Quassel.
urlpreview	Use <pkg>dev-qt/qtwebengine</pkg> rendering engine for showing URL thumbnails.

rbot

Flag	Description
cal	Add dependency over a package providing the /usr/bin/cal command, which is needed to enable the "cal" plugin for rbot. If the USE flag is disabled the plugin is also disabled by default.
figlet	Add dependency over <pkg>app-misc/figlet</pkg>, which is used by the "figlet" plugin for rbot. If the USE flag is disabled the plugin will be unable to use figlet; if toilet is also disabled, the plugin will be disabled.
host	Add dependency over <pkg>net-dns/bind</pkg> (providing /usr/bin/host), which is needed to enable the "host" plugin for rbot. If the USE flag is disabled the plugin is also disabled by default.
toilet	Add dependency over <pkg>app-misc/toilet</pkg>, which is used by the "figlet" plugin for rbot. If the USE flag is disabled the plugin will be unable to use toilet; if figlet is also disabled, the plugin will be disabled.
translator	Add dependency over <pkg>dev-ruby/mechanize</pkg>, which is needed to enable the "translator" plugin for rbot. If the USE flag is disabled the plugin is also disabled by default.

soju

Flag	Description
moderncsqlite	Use moderncsqlite, a cgo-free port of SQLite

unrealircd

Flag	Description
class-nofakelag	Enable an unsupported class::options flag called “nofakelag” allowing you to grant fakelag exemption to normal user (instead of just opers).
geoip-classic	Use legacy dev-libs/geoip for geoip.
operoverride	Enable OperOverride extension
operoverride-verify	Enable requiring opers to invite themselves to +s/+p channels

weechat

Flag	Description
alias	Enable plugin for alias control
buflist	Enable buflist plugin
charset	Enable encoding conversions
fset	Enable fast set plugin
relay	Enable relay plugin (experimental)
relay-api	Enable json API support for the relay plugin (experimental)
trigger	Enable trigger plugin
typing	Enable typing plugin
xfer	Enable xfer plugin support

net-libs

aqbanking

Flag	Description
ebics	Enable support for Electronic Banking Internet Communication Standard (EBICS)

axtls

Flag	Description
cgi-lua	Enables lua backed cgi for axhttpd server
cgi-php	Enables php backed cgi for axhttpd server

c-client

Flag	Description
topal	Enable support for net-mail/topal for use with <pkg>mail-client/alpine</pkg>

canlock

Flag	Description
header-parser	Build article header parsers

cvm

Flag	Description
vpopmail	Enable vpopmail support

daq

Flag	Description
afpacket	Build the AFPacket data acquisition module. Functions similar to the PCAP module but with better performance. Snort can run unprivileged when using this module. AFpacket supports both inline and passive modes.
dump	Build the Dump data acquisition module. The dump DAQ allows you to test the various inline mode features available in 2.9 Snort like injection and normalization.
ipq	Build the IPQ data acquisition module. IPQ is the old way to process iptables packets for inline deployments. Snort can not run unprivileged when using this module.
nfq	Build the NFQ data acquisition module. NFQ is the new way to process iptables packets for inline deployments. Snort can not run unprivileged when using this module.

freaklabs-chibiarduino

Flag	Description
promisc	Enable promisc in the config file for packet sniffing

gloox

Flag	Description
xhtmlim	expose internal NodeList for optional XHTML-IM rendering without external parser

gnome-online-accounts

Flag	Description
ms365	Enable Microsoft 365 provider

gnutls

Flag	Description
post-quantum	Support post-quantum cryptography (PQC) using <pkg>dev-libs/leancrypto</pkg>.

libetpan

Flag	Description
liblockfile	Enable support for liblockfile library

libmicrohttpd

Flag	Description
thread-names	Assign thread names to internal threads, useful for dependent apps debugging

libpcap

Flag	Description
yydebug	Enable parser debugging code

libproxy

Flag	Description
duktape	Use <pkg>dev-lang/duktape</pkg> for PAC parsing

libsrtp

Flag	Description
aesicm	Use AES ICM cryptographic algorithm

libtorrent-rasterbar

Flag	Description
dht	Enable DHT (distributed hash table) support

libupnp

Flag	Description
blocking-tcp	Do not use async socket calls
reuseaddr	Allow clean restarts by binding the socket with SO_REUSEADDR

libvncserver

Flag	Description
24bpp	Enable 24bpp support
filetransfer	Enable support for TightVNC's file transfer protocol

libwebsockets

Flag	Description
access-log	Support generating Apache-compatible access logs
generic-sessions	With the Generic Sessions plugin
http-proxy	Support for rewriting HTTP proxying
lejp	With the Lightweight JSON Parser
peer-limits	Track peers and restrict resources a single peer can allocate
server-status	Support json + jscript server monitoring
sqlite3	Require SQLITE3 support

mbedtls

Flag	Description
cmac	Enable block cipher-based message authentication code algorithm
havege	Enable the HAVEGE random generator. Warning: the HAVEGE random generator is not suitable for virtualized environments

nghttp2

Flag	Description
hpack-tools	Install HPACK (header compression) helper tools

nodejs

Flag	Description
corepack	Enable the experimental corepack package management tool
inspector	Enable V8 inspector
npm	Enable NPM package manager
snapshot	Enable snapshot creation for faster startup
system-ssl	Use system OpenSSL instead of the bundled one

paho-mqtt-c

Flag	Description
high-performance	The debugging aids internal tracing and heap tracking are not included

pjproject

Flag	Description
g711	Include G.711 codecs in the build
g7221	Include G.722.1 codec in the build
l16	Include Linear/L16 codec family in the build
resample	Include resampling implementations in the build
silk	Include SILK support in the build
v4l2	Include Video4Linux v2 support in the build

rpc2

Flag	Description
codatunneld	Support for codatunneld.

shairplay

Flag	Description
playfair	Add support for handling fairplay handshake (used in for example screen mirroring)

tdlib

Flag	Description
tde2e	Install tde2e headers and cmake config

tox

Flag	Description
av	Adds support for audio and video.
dht-node	Enables DHT Bootstrap Node.
key-utils	Builds utilities to create custom keys and profiles
log-debug	Log level: 4
log-error	Log level: 1
log-info	Log level: 3
log-trace	Log level: 5
log-warn	Log level: 2

xrootd

Flag	Description
macaroons	Enable support for macaroons with <pkg>dev-libs/libmacaroons</pkg>
scitokens	Enable support for scitokens with <pkg>dev-cpp/scitokens-cpp</pkg>
xrdec	Enable erasure coding support (XrdEc plugin) with <pkg>dev-libs/isa-l</pkg>

net-mail

cyrus-imapd

Flag	Description
calalarm	Enable CalDAV alarm support
replication	Enable replication support

dovecot

Flag	Description
lucene	Add lucene full text search (FTS) support using <pkg>dev-cpp/clucene</pkg>
managesieve	Add managesieve protocol support
solr	Add solr full text search (FTS) support
textcat	Add libtextcat language guessing support for full text search (FTS)

fetchmail

Flag	Description
socks	Enable support for socks proxy

lbdb

Flag	Description
abook	Enables <pkg>app-misc/abook</pkg> support
evo	Add support for <pkg>mail-client/evolution</pkg>
pda	Add support for portable devices

mailutils

Flag	Description
clients	Build client programs - frm maidag mail sieve messages readmsg dotlock movemail mimeview mh
servers	Build server programs - imap4d pop3d comsatd

notmuch

Flag	Description
mutt	Install helper script for Mutt
nmbug	Install experimental tag sharing / pseudo-bug-tracking script for Notmuch (see http://notmuchmail.org/nmbug/)

stalwart-mail

Flag	Description
rocks	Enables rocksdb storage backend

tpop3d

Flag	Description
authexternal	Enable authentication by an external program
sha1	Use OpenSSL for sha1 encrypted passwords.

vpopmail

Flag	Description
clearpasswd	Enables cleartext password storage in the vpasswd files
ipalias	Enables enable-ip-alias-domains

net-misc

asterisk

Flag	Description
blocks	Utlize -fblocks (only supported by, and required when using, clang/LLVM)
freetds	Add support for the TDS protocol to connect to MSSQL/Sybase databases
gtalk	Enable support for Google Talk services
newt	Include additional tools that require redhats windowing toolkit
pjproject	Enable support for pjproject (pjsip)
span	Enable support for the spandsp codec
statsd	Enable statsd integration
voicemail_storage_imap	Uses an IMAP server to store configuration & messages.
voicemail_storage_odbc	Uses ODBC to talk to a SQL database backend.

cgminer

Flag	Description
ants1	Enable support for Antminer S1 Bitmain
ants2	Enable support for Antminer S2 Bitmain
ants3	Enable support for Antminer S3 Bitmain
avalon	Enable support for Avalon ASICs
avalon-miner	Enable support for Avalon miner ASICs
avalon2	Enable support for Avalon2 ASICs
avalon4	Enable support for Avalon4 ASICs
avalon7	Enable support for Avalon7 ASICs
bab	Enable support for BlackArrow Bitfury
bflsc	Enable support for BFL ASICs
bitforce	Enable support for mining with ButterFly Labs BitFORCE FPGAs
bitfury	Enable support for mining with BitFury ASICs
bitmine_A1	Enable support for mining with Bitmine.ch A1 ASICs
blockerupter	Enable support for mining with BlockRupter ASICs
cointerra	Enable support for mining with Cointerra ASICs
drillbit	Enable support for mining with Drillbit BitFury ASICs
hashfast	Enable support for mining with Hashfast
hashratio	Enable support for mining with Hashratio
icarus	Enable support for mining with Icarus FPGAs
klondike	Enable support for mining with Klondik ASICs
knc	Enable support for mining with KnC miners
minion	Enable support for mining with BlackArrow Bitfury
modminer	Enable support for mining with ModMiner FPGAs
sp10	Enable support for Spondoolies SP10
sp30	Enable support for Spondoolies SP30

chrony

Flag	Description
cmdmon	Support for command and monitoring
nts	Support for Network Time Security (NTS). Uses <pkg>net-libs/gnutls</pkg>
phc	Support for the PTP (Precision Time Protocol) Hardware Clock (PHC) interface
refclock	Support for reference clocks
sechash	Enable support for hashes other than MD5

connman

Flag	Description
l2tp	Use <pkg>net-dialup/xl2tpd</pkg> for L2TP VPN support.
pptp	Use <pkg>net-dialup/pptpclient</pkg> for PPTP VPN support.
vpnc	Use <pkg>net-vpn/vpnc</pkg> for cisco VPN support.
wireguard	Enable WireGuard VPN support.
wispr	Enable support for WISPr hotspot logins.

curl

Flag	Description
alt-svc	Enable alt-svc support
curl_ssl_mbedtls	Use mbed TLS
curl_ssl_rustls	Use Rustls
hsts	Enable HTTP Strict Transport Security
httpsrr	Enable HTTPS Resource Record support
sasl-scram	Enable snupport for additional SASL SCRAM-SHA authentication methods via <pkg>net-misc/gsasl</pkg>

dropbear

Flag	Description
bsdpty	Add support for legacy BSD pty's rather than dynamic UNIX pty's -- do not use this flag unless you are absolutely sure you actually want it
test-async	Enable tests using <pkg>dev-python/asyncssh</pkg>

etherdfs

Flag	Description
tsr	Install the precompiled TSR program for DOS, which acts as a client.

eventd

Flag	Description
webhook	Enable plugin to send payloads to webhook handlers

freerdp

Flag	Description
aad	Enable login via Azure AD
camera	Enable camera support

frr

Flag	Description
nhrp	Build Next Hop Resolution Protocol daemon
ospfapi	Build OSPFAPI support
rpki	Enable RPKI

geckodriver

Flag	Description
unchained	Apply the geckodriver-unchained patch, for Gecko-based non-Firefox browsers (e.g. Librewolf)

gerbera

Flag	Description
exiv2	Use <pkg>media-gfx/exiv2</pkg> to extract EXIF information

htbinit

Flag	Description
esfq	Add support for Enhanced Stochastic Fairness queueing discipline.

hylafaxplus

Flag	Description
mgetty	Receive faxes via serial port connections

icaclient

Flag	Description
hdx	Install and enable hdx-realtime-media-engine plugin
selfservice	Install and enable the self-service component

icecast

Flag	Description
yp	Build support for yp public directory listings

inetutils

Flag	Description
dnsdomainname	Enable domainname
ftpd	Enable ftpd
ifconfig	Enable ifconfig
inetd	Enable inetd
ping6	Enable ping6
rcp	Enable rcp
rexec	Enable rexec
rexecd	Enable rexecd
rlogin	Enable rlogin
rlogind	Enable rlogind
rshd	Enable rshd
syslogd	Enable syslogd
talkd	Enable talkd
telnetd	Enable telnetd
tftpd	Enable tftpd
traceroute	Enable traceroute
uucpd	Enable uucpd
whois	Enable whois

iputils

Flag	Description
arping	Build and install arping -- tool for sending ARP requests to peers (see also <pkg>net-analyzer/arping</pkg>)
clockdiff	Build and install clockdiff -- tool for comparing clocks via ICMP packets
tracepath	Build and install tracepath -- tool for tracing network paths for discovering MTU values

kafka-bin

Flag	Description
connect	Install init for Kafka Connect Distributed mode

kafkacat

Flag	Description
avro	Enable avro serialization/deserialization support

kea

Flag	Description
shell	Install kea-shell text management client for Control Agent

lldpd

Flag	Description
cdp	Enable Cisco Discovery Protocol
dot1	Enable Dot1 extension (VLAN stuff)
dot3	Enable Dot3 extension (PHY stuff)
edp	Enable Extreme Discovery Protocol
fdp	Enable Foundry Discovery Protocol
lldpmed	Enable LLDP-MED extension
sanitizers	Enable code instrumentation with selected sanitizers
sonmp	Enable SynOptics Network Management

memcached

Flag	Description
slabs-reassign	Allow manual reassignment of memory slabs at the cost of slab optimizations.

minidlna

Flag	Description
netgear	Enable netgear branding
readynas	Enable readynas branding

miniupnpd

Flag	Description
igd2	Build for IGDv2 instead of an IGDv1
leasefile	Enable lease file.
pcp-peer	Enable support for PCP-PEER to allow NAT-PMP clients to mangle their packets.
portinuse	Check if a port is in use before allowing a NAT-PMP client to map it.
strict	Be more strict regarding compliance with UPnP specifications.

modemmanager

Flag	Description
qmi	Enable support for the QMI modem protocol used by devices with Qualcomm chipsets

moonlight

Flag	Description
glslow	Prefer direct KMS/DRM rendering over EGL/GLES rendering for better performance on some weaker GPUs
soundio	Enable sound output via <pkg>media-libs/libsoundio</pkg> instead of <pkg>media-libs/libsdl2</pkg>
vkslow	Prefer hardware YUV-RGB conversion and scaling over Vulkan for better performance on some weaker GPUs

mulk

Flag	Description
checksum	Enable checksum verification for Metalink from <pkg>dev-libs/openssl</pkg>

networkmanager

Flag	Description
concheck	Enable connectivity checking support (needed for Captive portals detection)
connection-sharing	Support connection sharing (uses <pkg>net-dns/dnsmasq</pkg>)
dhclient	Use dhclient from <pkg>net-misc/dhcp</pkg> for getting an IP via DHCP
dhcpcd	Use <pkg>net-misc/dhcpcd</pkg> for getting an IP
nbft	Enable NBFT support in the initrd generator
ovs	Enable OpenVSwitch support
ppp	Enable support for mobile broadband and PPPoE connections using <pkg>net-dialup/ppp</pkg>

nextcloud-client

Flag	Description
dolphin	Install the <pkg>kde-apps/dolphin</pkg> extension

ntp

Flag	Description
openntpd	Allow ntp to be installed alongside openntpd
parse-clocks	Add support for PARSE clocks

ntpsec

Flag	Description
arbiter	Arbiter 1088A/B GPS driver
early	Drop root privileges early
gpsd	Enable gpsd daemon support
heat	Install contrib heat generating scripts
hpgps	Hewlett Packard GPS driver
jjy	JJY driver
modem	NIST/USNO/PTB Modem Time Services
nist	Set local clock deps
ntpviz	Make visualizations of offsets, jiffies, etc.
oncore	Oncore driver
smear	Specify the interval over which a leap second is applied (experimental)
spectracom	Spectracom driver
trimble	Trimble driver
truetime	Trutime driver (deprecated)
zyfer	Zyfer driver

ofono

Flag	Description
atmodem	ETSI AT modem support.
datafiles	Enable install configuration and data files.
dundee	Enable BlueTooth DUN deamon support.
isimodem	Enable PhoNet/ISI modem support.
phonesim	Enable phone Simulator support
qmimodem	Enable Qualcomm QMI modem support
system-ell	Use the system-wide <pkg>dev-libs/ell</pkg>

oidentd

Flag	Description
masquerade	Enable support for masqueraded/NAT connections

olsrd

Flag	Description
pud	Install the Node Position Update plugin

openssh-contrib

Flag	Description
X509	Adds support for X.509 certificate authentication
hpn	Enable high performance ssh

pkixssh

Flag	Description
ssl-engine	Enable OpenSSL (hardware) ENGINE support

plowshare

Flag	Description
view-captcha	View captcha with aview

ps3mediaserver

Flag	Description
tsmuxer	Install optional dependencies for transcoding support via <pkg>media-video/tsmuxer</pkg>

ptpd

Flag	Description
slave-only	Enable slave only operation (remove master mode functionality)

r8125

Flag	Description
fiber	Enable Fiber PHY support
hw-optim-tx	Enable hardware optimised TX ("TX No Close" driver option) by default

r8152

Flag	Description
center-tap-short	Enable support for center tap short

remmina

Flag	Description
gvnc	Enable GVNC plugin using gtk-vnc, suitable for KVM and Vino servers

rsync

Flag	Description
rrsync	Install rrsync script to setup restricted rsync users via ssh logins
stunnel	Provide helper scripts for using rsync via &gt;=<pkg>net-misc/stunnel</pkg>-4
system-zlib	Use system zlib instead of bundled one. This is incompatible with older rsync releases!

scponly

Flag	Description
gftp	Enables gFTP compatibility
scp	Enables scp compatibility with potential security risks
unison	Enables Unison compatibility with potential security risks
wildcards	Enables wildcard processing with potential security risks
winscp	Enables WinSCP 2.0 compatibility with potential security risks

seafile-client

Flag	Description
shibboleth	Build support for Shibboleth single sign-on

smb4k

Flag	Description
discovery	Build with <pkg>net-libs/kdsoap-ws-discovery-client</pkg> support to discover domains and workgroups

sntpd

Flag	Description
adjtimex	Install adjtimex for the clock adjustment algorithm.

spice-gtk

Flag	Description
mjpeg	Enable builtin mjpeg video decoder

sshrc

Flag	Description
mosh	Install Support for mosh

streamtuner

Flag	Description
xiph	Enable xiph.org plug-in.

stunnel

Flag	Description
stunnel3	Install the stunnel3 wrapper.

wget

Flag	Description
cookie-check	Enable cookie checks via <pkg>net-libs/libpsl</pkg>

xmrig

Flag	Description
donate	Set the default donation level to 1% instead of 0

yt-dlp

Flag	Description
deno	Pull in <pkg>dev-lang/deno-bin</pkg> by default needed for proper YouTube support (if this USE is masked on your profile, refer to yt-dlp's documentation for lesser supported alternatives which are not supported out-of-the-box due to security concerns)

zerotier

Flag	Description
controller	Enable support for the network controller microservice (NONCOMM License)
sso	Enable support for Single sign-on through zeroidc

net-nds

389-ds-base

Flag	Description
accountpolicy	Enable account policy plugin - automatically lock an account after a certain amount of time has elapsed
auto-dn-suffix	Enable auto bind with auto dn suffix over unix domain socket (LDAPI) support
autobind	Enable auto bind over unix domain socket (LDAPI) support
bitwise	Enable bitwise plugin - supported data in raw/bitwise format
dna	Enable dna (distributed numeric assignment ) plugin - to automatically assign unique uid numbers to new user entries as they are created.
ldapi	Enable LDAP over unix domain socket (LDAPI) support
pam-passthru	Enable pam-passthru plugin - for simple and fast system services used in ldap

nsscache

Flag	Description
nsscache	Depend on <pkg>sys-auth/libnss-cache</pkg> to handle flat files

openldap

Flag	Description
${IUSE_CONTRIB}
autoca	Automatic Certificate Authority overlay
cleartext	Enable use of cleartext passwords
kinit	Enable support for kerberos init
overlays	Enable contributed OpenLDAP overlays
pbkdf2	Enable support for pbkdf2 passwords
sha2	Enable support for pw-sha2 password hashes
smbkrb5passwd	Enable overlay for syncing ldap, unix and lanman passwords

rpcbind

Flag	Description
remotecalls	Enable remote calls
warmstarts	Enables rpcbind to cache configuration for warm restarts

net-news

rssguard

Flag	Description
qtmultimedia	Enable media player support via <pkg>dev-qt/qtmultimedia</pkg>

sfeed

Flag	Description
mono{,-highlight}
newsboat
templeos
theme-mono	Use mono theme
theme-mono-highlight	Use mono_highlight theme
theme-newsboat	Use newsboat theme
theme-templeos	Use templeos theme

net-nntp

nzbget

Flag	Description
parcheck	Enable support for checking PAR archives

slrn

Flag	Description
canlock	Add support for cancel locks via <pkg>net-libs/canlock</pkg>
uudeview	Add support for yEnc coding and more using <pkg>dev-libs/uulib</pkg>

tin

Flag	Description
cancel-locks	Enable Cancel-Lock header functionality
libtls	Prefer <pkg>dev-libs/libretls</pkg> as SSL/TLS provider (ineffective with USE=-ssl)

net-p2p

airdcpp-webclient

Flag	Description
nat-pmp	Enable support for the NAT-PMP protocol

bitcoin-core

Flag	Description
external-signer	Include support for external wallet signer programs
system-libsecp256k1	Link with <pkg>dev-libs/libsecp256k1</pkg> rather than embedding an internal copy
wallet	Support creating and loading wallets

dbhub

Flag	Description
switch-user	Enable support for switching user

deluge

Flag	Description
webinterface	Install dependencies needed for the web interface

ktorrent

Flag	Description
bwscheduler	Schedule upload and download limits over a period of a week
downloadorder	Specify the download order of a multi-file torrent
infowidget	Displays general information about a torrent in several tabs
ipfilter	Filter IP addresses through a blocklist
logviewer	Displays the logging output
magnetgenerator	Generates magnet URI's
mediaplayer	Enable <pkg>dev-qt/qtmultimedia</pkg> based media player
scanfolder	Scan folders for torrent files and load them
shutdown	Shutdown when done

mldonkey

Flag	Description
fasttrack	enable fasttrack support
gnutella	enable gnutella and gnutella2 support

rtorrent

Flag	Description
tinyxml2	Use vendor tinyxml2 instead of xmlrpc-c. This allows significant reduction in overhead

net-print

cups-filters

Flag	Description
pclm	Enable PCLm support

cups-meta

Flag	Description
browsed	Include support for the cups-browsed daemon.

dymo-cups-drivers

Flag	Description
usb-modeswitch	Include usb_modeswitch for some hardware (bug #601242)

fax4cups

Flag	Description
efax	Install <pkg>net-misc/efax</pkg> backend
hylafax	Install net-misc/hylafax backend
mgetty-fax	Install <pkg>net-dialup/mgetty</pkg> backend

hplip

Flag	Description
hpcups	Build the hpcups driver for cups (by HP)
hpijs	Build the IJS driver for cups (Foomatic)
libusb0	Depend on <pkg>virtual/libusb</pkg> SLOT 0. Some old printers do not work with <pkg>virtual/libusb</pkg> SLOT 1.
static-ppds	Use statically-generated PPDs instead of Dynamic PPDs. Although this is deprecated some printers may still need it to work properly. Use this flag if hp-setup fails to find/create a valid PPD file

hplip-plugin

Flag	Description
orblite	Install the ORBlite scanner plugin

kyocera-1x2x-mfp-driver

Flag	Description
rastertokpsl-fix	Use custom wrapper script to sanitize arguments before passing to 'rastertokpsl' filter program
th
zh-CN

net-proxy

haproxy

Flag	Description
51degrees	Device Detection using 51 Degrees
net_ns	Enable network namespace support (CONFIG_NET_NS)
prometheus-exporter	Also build the prometheus exporter
slz	Use <pkg>dev-libs/libslz</pkg> compression library
wurfl	Device Detection using WURFL

privoxy

Flag	Description
client-tags	Enable support for client-specific tags
compression	Allow privoxy to compress buffered content before sending to the client, if it supports it
extended-host-patterns	Enable and require PCRE syntax in host patterns. You must convert action files to PCRE, see privoxy-url-pattern-translator.pl (see tools USE flag). Use at your own risk!
extended-statistics	Gather extended statistics
fast-redirects	Support fast redirects
force	Allow single-page disable (force load)
fuzz	Exposes Privoxy internals to input from files or stdout. Intended for fuzzing testing
graceful-termination	Allow to shutdown Privoxy through the webinterface
image-blocking	Allows the +handle-as-image action, to send "blocked" images instead of HTML
png-images	Use PNG format instead of GIF for built-in images
toggle	Support temporary disable toggle via web interface
whitelists	Support trust files (white lists)

rejik

Flag	Description
banlists	Install upstream provided simple banlists

squid

Flag	Description
ecap	Adds support for loadable content adaptation modules (http://www.e-cap.org)
esi	Enable ESI for accelerators, will cause squid reverse proxies to be capable of the Edge Acceleration Specification (www.esi.org)
htcp	Enable HTCP protocol
ssl-crtd	Adds support for dynamic SSL certificate generation in SslBump environments
tproxy	Enables real Transparent Proxy support for Linux Netfilter TPROXY
wccp	Enable Web Cache Coordination Protocol
wccpv2	Enable Web Cache Coordination V2 Protocol

tinyproxy

Flag	Description
filter-proxy	Enable filtering of domains/URLS
reverse-proxy	Enable reverse proxying
transparent-proxy	Enable transparent proxying
upstream-proxy	Enable upstream proxying
xtinyproxy-header	Include the X-Tinyproxy header

trojan

Flag	Description
nat	Build with NAT support
reuseport	Build with SO_REUSEPORT support
tcpfastopen	Force build with TCP Fast Open support

tsocks

Flag	Description
envconf	Allow TSOCKS_CONF_FILE to specify configuration file
server-lookups	Allow hostname resolution _for_ SOCKS servers
tordns	Apply tordns patch which allows transparent TORification of the DNS queries

net-voip

murmur

Flag	Description
ice	Use <pkg>dev-libs/Ice</pkg> to enable remote control capabilities.

yate

Flag	Description
amrnb	use AMR-NB
dahdi	Enable Dahdi driver
ilbc-webrtc	Enable iLBC webrtc codec
isac-fixed	Enable iSAC fixed codec
isac-float	Enable iSAC float codec
tdmcard	Enable TDMV API card driver
wanpipe	Enable Wanpipe support
wpcard	Enable Wanpipe card driver
zaptel	Enable Zaptel driver

net-vpn

i2p

Flag	Description
az
bg
ca
es-AR
et
fa
gl
hi
hr
ku
mg
nn
sk
sl
sq
zh

libreswan

Flag	Description
ikev1	Enable the IKEv1 protocol

ocserv

Flag	Description
root-tests	Enable tests requiring root/namespaces

openconnect

Flag	Description
pskc	Enable PSKC file storage of HOTP/TOTP keys
stoken	Enable stoken support

openvpn

Flag	Description
dco	Enable support for kernel data channel offload
down-root	Enable the down-root plugin
iproute2	Enabled iproute2 support instead of net-tools
kernel-ovpn	Transitional flag to support OVPN mainline module

pptpd

Flag	Description
gre-extreme-debug	Log all GRE accepted packets when in debug mode (required if you want upstream support)

strongswan

Flag	Description
eap	Enable support for the different EAP modules that are supported
farp	Enable faking of ARP responses for virtual IP addresses assigned to clients (IKEv2 only)
strong
strongswan_plugins_
strongswan_plugins_${mod}
strongswan_plugins_acert	Enable support for X.509 attribute certificates
strongswan_plugins_addrblock	Enable support for the addrblock crypto plugin
strongswan_plugins_aes	Enable support for the aes plugin
strongswan_plugins_aesni	Enable support for Intel AES-NI crypto plugin
strongswan_plugins_af-alg	Enable support for the AF_ALG Linux kernel crypto API
strongswan_plugins_agent	Enable support for RSA/ECDSA private keys
strongswan_plugins_blowfish	Enable support for the blowfish plugin
strongswan_plugins_botan	Enable support for the botan library plugin
strongswan_plugins_bypass-lan	Enable support for the bypass-lan plugin
strongswan_plugins_ccm	Enable support for the ccm plugin
strongswan_plugins_chapoly	Enable ChaCha20/Poly1305 AEAD implementation and ChaCha20 XOF plugin
strongswan_plugins_cmac	Enable support for the cmac plugin
strongswan_plugins_connmark	Enable connmark plugin using conntrack based marks to select return path SA
strongswan_plugins_ctr	Enable support for the ctr plugin
strongswan_plugins_curve25519	Enable support for X25519 DH group and Ed25519 public key uthentication
strongswan_plugins_des	Enable DES/3DES cipher implementation
strongswan_plugins_dnskey	Enable support for parsing DNS public keys
strongswan_plugins_drbg	Enable support for the drgb plugin
strongswan_plugins_eap-radius	Enable EAP Radius plugin
strongswan_plugins_error-notify	Enable support for the error-notify plugin
strongswan_plugins_files	Enable support for local file:// URIs
strongswan_plugins_fips-prf	Enable support for the fips-prf plugin
strongswan_plugins_forecast	Enable multicast and broadcast forwarding plugin
strongswan_plugins_gcm	Enable support for the gcm plugin
strongswan_plugins_ha	Enable support for the ha plugin
strongswan_plugins_hmac	Enable support for the hmac plugin
strongswan_plugins_ipseckey	Enable support for the ipseckey plugin
strongswan_plugins_kdf	Enable support for the kdf plugin
strongswan_plugins_led	Enable support for the led plugin
strongswan_plugins_lookip	Enable support for the lookip plugin
strongswan_plugins_md4	Enable support for the md4 plugin
strongswan_plugins_md5	Enable support for the md5 plugin
strongswan_plugins_mgf1	Enable support for the mgf1 plugin
strongswan_plugins_nonce	Enable support the nonce plugin
strongswan_plugins_openxpki	Enable OCSP responder accessing OpenXPKI MySQL/MariaDB certificate database
strongswan_plugins_padlock	Enable support for the padlock plugin
strongswan_plugins_pem	Enable support for the pem plugin
strongswan_plugins_pgp	Enable support for the pgp plugin
strongswan_plugins_pkcs1	Enable pkcs1 support
strongswan_plugins_pkcs12	Enable pkcs12 support
strongswan_plugins_pkcs7	Enable pkcs7 support
strongswan_plugins_pkcs8	Enable pkcs8 support
strongswan_plugins_pubkey	Enable wrapper to handle raw public keys
strongswan_plugins_random	Enable RNG support with /dev/[u]random
strongswan_plugins_rc2	Enable plugin for RC2 support
strongswan_plugins_rdrand	Enable support for the rdrand plugin
strongswan_plugins_revocation	Enable X.509 CRL/OCSP revocation checking
strongswan_plugins_save-keys	Enable plugin that saves IKE and/or ESP keys to files compatible with Wireshark (for debugging)
strongswan_plugins_sha1	Enable plugin for SHA1 support
strongswan_plugins_sha2	Enable plugin for SHA2 support
strongswan_plugins_sha3	Enable plugin for SHA3 support
strongswan_plugins_soup	Enable libsoup based HTTP fetcher
strongswan_plugins_sshkey	Enable SSH key decoding routines
strongswan_plugins_stroke	Deprecated stroke configuration/control backend, to use with ipsec script and starter
strongswan_plugins_systime-fix	Enable support for the systime-fix plugin
strongswan_plugins_test-vectors	Enable set of test vectors for various algorithms
strongswan_plugins_unbound	Enable support for the unbound plugin
strongswan_plugins_unity	Enable support for the unity plugin
strongswan_plugins_vici	Enable support for the vici plugin
strongswan_plugins_whitelist	Enable support for the whitelist plugin
strongswan_plugins_x509	Enable plugin for advanced X.509 functionality
strongswan_plugins_xauth-noauth	Enable support for the xauth-noauth plugin
strongswan_plugins_xcbc	Enable support for XCBC plugin

tinc

Flag	Description
uml	Enable support for User Mode Linux Sockets

tor

Flag	Description
scrypt	Use <pkg>app-crypt/libscrypt</pkg> for the scrypt algorithm

wireguard-modules

Flag	Description
module-src	Install the module source code to /usr/src, in case you like building kernel modules yourself.

wireguard-tools

Flag	Description
wg-quick	Install the wg-quick(8) helper tool. Most users want to use this.

net-wireless

aircrack-ng

Flag	Description
airdrop-ng	Build airdrop-ng
airgraph-ng	Build airgraph-ng

bladerf

Flag	Description
tecla	use libtecla for command line editing, tab completion, and history

bladerf-fpga

Flag	Description
wlanxA9	bitstream for the xA9 to do wifi"
x115	bitstream for the x115 kLE Cyclone IV FPGA bladerf model"
x40	bitstream for the x40 kLE Cyclone IV FPGA bladerf model"
xA4	bitstream for the xA4 49 kLE Cyclone V FPGA bladerf 2.0 micro model"
xA5	bitstream for the xA5 77 kLE Cyclone V FPGA bladerf 2.0 micro model"
xA9	bitstream for the xA9 301 kLE Cyclone V FPGA bladerf 2.0 micro model"

bluez

Flag	Description
btpclient	Enable BTP client
extra-tools	Install tools that upstream doesn't install on purpose by default. All this tools shouldn't be used. Then, please notify upstream about you still need them to let them know the situation.
obex	Enable OBEX transfer support

gnome-bluetooth

Flag	Description
sendto	Build the bluetooth-sendto application to send files to various locations/devices

gnuradio

Flag	Description
analog	enable analog signal processing blocks
channels	enable channel mode blocks
ctrlport	enable control port interface
digital	enable digital signal processing blocks
dtv	enable digital tv signal processing blocks
fec	enable block for convolutional encoding using the CCSDS standard polynomial ("Voyager")
grc	enable GNU Radio Companion graphical tool to design signal processing flow graphs
iio	enable enable support for IIO devices
modtool	enable modtool for editing GNU Radio modules and components
performance-counters	enable block performance counters
trellis	enable trellis blocks for FSM
wavelet	enable wavelet signal processing blocks

gr-osmosdr

Flag	Description
iqbalance	Enable support for I/Q balancing using gr-iqbal through <pkg>net-wireless/gr-iqbal</pkg>
xtrx	Build with xtrx Hardware Driver support through <pkg>net-wireless/libxtrx</pkg>

hostapd

Flag	Description
internal-tls	Use internal TLSv1 implementation instead of depending on OpenSSL or GnuTLS
suiteb	Adding support for NSA Suite B Cryptography

iwd

Flag	Description
wired	Enable ethernet authentication daemon

kismet

Flag	Description
ubertooth	Enable capture source for ubertooth to sniff bluetooth low energy

libxtrxll

Flag	Description
usb3380	support xtrx usb model

rtl_433

Flag	Description
soapysdr	Build with SoapySDR support

ubertooth

Flag	Description
bluez	use bluez to support clock following and scanning
ubertooth1-firmware	Build/install ubertooth1-firmware

uhd

Flag	Description
b100	support B100 hardware
b200	support B200, B210, B200mini, B205mini hardware
e300	support E300, E310 hardware
mpmd	support N300, N310 hardware
octoclock	Octoclock Network Support
usrp1	support USRP1 hardware
usrp2	support USRP2, N200, N210 hardware
x300	support X300, X310 hardware

unifi

Flag	Description
system-mongodb	Start <pkg>dev-db/mongodb</pkg> by its own init scripts instead of managed by UniFi.

urh

Flag	Description
limesdr	use native backend which directly uses <pkg>net-wireless/limesuite</pkg>

wepattack

Flag	Description
john	Build with <pkg>app-crypt/johntheripper</pkg> support

wpa_supplicant

Flag	Description
ap	Add support for access point mode
broadcom-sta	Flag to help users disable features not supported by broadcom-sta driver
eap-sim	Add support for EAP-SIM authentication algorithm
eapol-test	Build and install eapol_test binary
fils	Add support for Fast Initial Link Setup (802.11ai)
macsec	Add support for wired macsec
mbo	Add support Multiband Operation
p2p	Add support for Wi-Fi Direct mode
tkip	Add support for WPA TKIP (deprecated due to security flaws in 2009)
uncommon-eap-types	Add support for GPSK, SAKE, GPSK_SHA256, IKEV2 and EKE
wep	Add support for Wired Equivalent Privacy (deprecated due to security flaws in 2004)

sci-astronomy

cpl

Flag	Description
gasgano	Enable support for <pkg>sci-astronomy/gasgano</pkg> file organizer

sextractor

Flag	Description
modelfit	Enable profile model fitting, needs <pkg>sci-libs/atlas</pkg> and <pkg>sci-libs/fftw</pkg>

siril

Flag	Description
wcs	Add supprt astrometry features using <pkg>sci-astronomy/wcslib</pkg>

stellarium

Flag	Description
deep-sky	Install extra deep sky objects catalog (may affect performance)
lens-distortion	Enable lens distortion estimator plugin
show-my-sky	Enable a better atmosphere model via <pkg>sci-astronomy/calcmysky</pkg>
stars	Install extra star catalogs
telescope	Enable telescope control via <pkg>sci-libs/indilib</pkg>

swarp

Flag	Description
cfitsio	Link with <pkg>sci-libs/cfitsio</pkg>

sci-biology

abyss

Flag	Description
misc-haskell	build abyss-samtobreak tool, pull in haskell toolchain

bioperl

Flag	Description
db	Install <pkg>sci-biology/bioperl-run</pkg>
run	Install <pkg>sci-biology/bioperl-run</pkg>

clustalw-mpi

Flag	Description
mpi-njtree	Use MPI (as opposed to serial) code for computing neighbor-joining trees
static-pairalign	Use static (as opposed to dynamic) scheduling for pair alignments

sci-calculators

units

Flag	Description
units-cur	Install the units_cur python script that updates currencies

sci-chemistry

gromacs

Flag	Description
build-manual	Build manual instead of downloading it
gmxapi	Add support for gmxapi library
gmxapi-legacy	Enable installing lagacy headers
nnpot	Allow to use <pkg>sci-ml/caffe2</pkg> for NN Potentials
single-precision	Single precision version of gromacs (default)
tng	Enable new trajectory format - tng

molsketch

Flag	Description
openbabel	Interface for <pkg>sci-chemistry/openbabel</pkg> to support many file formats

openbabel

Flag	Description
inchi	Build support for IUPAC International Chemical Identifier format

vmd

Flag	Description
gromacs	Add support for TNG file format
msms	Add support for MSMS SES calcualtion tool
povray	Add support for povray raytracer for HQ images
tachyon	Add support for tachyon raytracer for HQ images

sci-electronics

gerbv

Flag	Description
unit-mm	Set default unit for coordinates in status bar to mm

gtkwave

Flag	Description
fasttree	Enables experimental Fast SST Tree widget code.

ktechlab

Flag	Description
gpsim	Enable support for Microchip PIC microcontrollers similation using <pkg>dev-embedded/gpsim</pkg>

pcb

Flag	Description
gcode	gcode file export
gsvit	GSvit file export
m4lib-png	Enable creating png previews for the m4 library
nelma	NELMA file export
toporouter	Build toporouter

sci-geosciences

gmt

Flag	Description
gmttria	Non GNU triangulation method, more efficient

gpsd

Flag	Description
${GPSD_PROTOCOLS[@]/
gpsd_protocols_aivdm	AIVDM protocol support
latency-timing	support latency timing information

mapserver

Flag	Description
postgis	Enable <pkg>dev-db/postgis</pkg> support

merkaartor

Flag	Description
zbar	Enable barcode support in MWalkingPapersBackground/GeoImage via <pkg>media-gfx/zbar</pkg>

owntracks-recorder

Flag	Description
tours	Enable recorder support for shared views

qgis

Flag	Description
geographiclib	Build with GeographicLib (geodesic, gravity, geomagnetic calculations and conversions)
georeferencer	Determines whether georeferencer plugin should be built
grass	Install and integrate Grass GIS as well
mapserver	Determines whether mapserver should be built

viking

Flag	Description
libexif	Use <pkg>media-libs/libexif</pkg> for EXIF support

sci-libs

avogadrolibs

Flag	Description
jkqtplotter	Enable charts and spectra using <pkg>sci-libs/jkqtplotter</pkg>
spglib	Find and set the Hall number for a crystal using <pkg>sci-libs/spglib</pkg>

blis

Flag	Description
cpu_flags_arm_{neon,v7,v8,sve}
cpu_flags_ppc_{vsx,vsx3}
cpu_flags_x86_{ssse3,avx,fma3,fma4,avx2,avx512vl}

ceres-solver

Flag	Description
schur	Enable fixed-size schur specializations (disable if binary size is an issue)

cgnslib

Flag	Description
base-scope	Enable base scoped families or connectivities
scoping	Enable scoping of enumeration values

cholmod

Flag	Description
cholesky	Enable sparse Cholesky factorisation
matrixops	Support basic sparse and dense matrix operations (add, multiply, scale, et cetera)
modify	Enable Cholesky-modification routines like update, downdate, row-add, and row-delete
supernodal	supernodal cholesky factorisation

clblas

Flag	Description
ktest	A command line tool for testing single clBLAS kernel.

dealii

Flag	Description
arborx	Adds support for ARBORX (<pkg>sci-libs/arborx</pkg>)
ginkgo	Add support for ginkgo (<pkg>sci-libs/ginkgo</pkg>)
gmsh	Add support for gmsh (<pkg>sci-libs/gmsh</pkg>)
p4est	Add support for p4est (<pkg>sci-libs/p4est</pkg>)
trilinos	Add support for trilinos (<pkg>sci-libs/trilinos</pkg>)

fftw

Flag	Description
zbus	Adds support for ZBus cycle-counter of mips

flexiblas

Flag	Description
blis	Support <pkg>sci-libs/blis</pkg> provider
system-blas	Install symlinks to use FlexiBLAS as the system BLAS / LAPACK provider.

gdal

Flag	Description
armadillo	Use <pkg>sci-libs/armadillo</pkg> for faster TPS transform computation
exprtk	Enable support for additional advanced C++ VRT expressions with <pkg>dev-cpp/exprtk</pkg>
gml	Enable support for <pkg>dev-libs/xerces-c</pkg> C++ API
libaec	Enable support Adaptive Entropy Coding with <pkg>sci-libs/libaec</pkg>
spatialite	Enable Spatial DBMS over sqlite <pkg>dev-db/spatialite</pkg>
system-tiff	Build against system <pkg>media-libs/tiff</pkg> and <pkg>sci-libs/libgeotiff</pkg> (JPEG XL not supported with this enabled)

gmsh

Flag	Description
alglib	Enable alglib support for mesh optimizers
gmm	A simple alternative to petsc based on <pkg>sci-mathematics/gmm</pkg>
med	Enables med support
voro	Enable support to <pkg>sci-libs/voro++</pkg> meshing

gsl

Flag	Description
cblas-external	Link gsl with external cblas provided by (<pkg>virtual/cblas</pkg>) instead of shipped internal version

hdf5

Flag	Description
hl	Enable high level API (https://support.hdfgroup.org/HDF5/doc/HL/index.html)

hipBLAS

Flag	Description
rocsolver	Add additional functions from <pkg>sci-libs/rocSOLVER</pkg>

hipBLASLt

Flag	Description
gfx1100
gfx1101
gfx1103
gfx1150
gfx1151
gfx1200
gfx1201
gfx908
gfx90a
gfx940
gfx941

ipopt

Flag	Description
asl	AMPL Solver Library support and build the 'ipopt' binary

kissfft

Flag	Description
int16	Build library for primary data type of int16_t
int32	Build library for primary data type of int32_t

lapack

Flag	Description
lapacke	Build LAPACKE

lemon

Flag	Description
coin	Enable the <pkg>sci-libs/coinor-clp</pkg> and <pkg>sci-libs/coinor-cbc</pkg> graph algorithms

libsigrok

Flag	Description
gpib	Enable drivers that need <pkg>sci-libs/linux-gpib</pkg>

lis

Flag	Description
quad	Enable quadruple precision operations
saamg	Build the Smoothed Aggregation Algebraic MultiGrid preconditioner

miopen

Flag	Description
amdgpu_targets_gfx908	CDNA Accelerator, codename arcturus, including AMD Instinct MI100 Accelerator
amdgpu_targets_gfx90a	CDNA2 Accelerator, codename aldebaran, including AMD Instinct MI200 series Accelerators
amdgpu_targets_gfx942	CDNA3 Accelerator, codename aqua_vangaram, MI300A and MI300X rev >=1
amdgpu_targets_gfx950	CDNA4 Accelerator, including AMD Instinct MI350X and MI355X
composable-kernel	Use <pkg>sci-libs/composable-kernel</pkg> for GEMM-like and reduction-like operators
rocblas	Build with <pkg>sci-libs/rocBLAS</pkg> support

mkl

Flag	Description
gnu-openmp	Install versions with GNU OpenMP (libgomp) support.
llvm-openmp	Install versions with LLVM OpenMP (libomp) support.

octomap

Flag	Description
dynamicEDT3D	Build and install dynamicEDT3D library: A library for incrementally updatable Euclidean distance transforms in 3D.

openblas

Flag	Description
relapack	Build the ReLAPACK extension to OpenBLAS

p4est

Flag	Description
vtk-binary	Enable binary vtk output. If disabled vtk files will be written in ASCII text format.

pastix

Flag	Description
starpu	Enable support for ther <pkg>dev-libs/starpu</pkg> runtime

rocFFT

Flag	Description
perfscripts	Install rocfft-perf performance visualization suite

sundials

Flag	Description
superlumt	Build with <pkg>sci-libs/superlu_mt</pkg>

trilinos

Flag	Description
all-packages	Enable all supported Trilinos packages (per default only a subset is built)
arprec	Add support for arprec (<pkg>sci-libs/arprec</pkg>)
clp	Add support for clp (<pkg>sci-libs/coinor-clp</pkg>)
gtest	Add support for gtest (<pkg>dev-cpp/gtest</pkg>)
taucs	Add support for taucs (<pkg>sci-libs/taucs</pkg>)
tvmet	Add support for tvmet (<pkg>dev-libs/tvmet</pkg>)

vtk

Flag	Description
all-modules	Build all modules
rendering	Building Redering modules
views	Building Views modules
vtkm	Build the viskores accelerations modules

sci-mathematics

bertini

Flag	Description
optimization	Accept upstream's choices for -O option.

coq

Flag	Description
native-compiler	Enable "native_compute" and compile the Coq Standard Library

cvc4

Flag	Description
cln	Use <pkg>sci-libs/cln</pkg>
proofs	Support for proof generation

eprover

Flag	Description
ho	enable support for higher-order logic

flint

Flag	Description
ntl	Build NTL interface

form

Flag	Description
devref	Build and install developers reference
doxygen	Build and install API documentation

gap

Flag	Description
memcheck	Enable memory checking

geomview

Flag	Description
motionaveraging	Enable experimental motion averaging technique

highs

Flag	Description
hipo	Build the new factorization-based interior-point solver requiring <pkg>sci-libs/amd</pkg>, <pkg>sci-libs/metis</pkg>, and <pkg>virtual/cblas</pkg>.

lcalc

Flag	Description
double-double	Use <pkg>sci-libs/qd</pkg>for double-double precision
pari	Use <pkg>sci-mathematics/pari</pkg> for elliptic curve L-functions
quad-double	Use <pkg>sci-libs/qd</pkg>for quad-double precision

mathematica

Flag	Description
bundle	Install from Wolfram's bundle file or from Mathematica only

maxima

Flag	Description
clozurecl64	Compile maxima with 64-bit Clozure Common Lisp (<pkg>dev-lisp/clozurecl</pkg>)
l10n_${lang/_/-}

octave

Flag	Description
qrupdate	Add support for <pkg>sci-libs/qrupdate</pkg>for QR and Cholesky update functions

petsc

Flag	Description
afterimage	Use Afterstep image library (<pkg>media-libs/libafterimage</pkg>)

polymake

Flag	Description
libpolymake	Build the polymake library to build applications using the C++ interface.
lrs	Enable <pkg>sci-libs/lrslib</pkg> interface for convex hull computations.
normaliz	Build the bundled extension for lattice computations using <pkg>sci-mathematics/normaliz</pkg>.
ppl	Enable <pkg>dev-libs/ppl</pkg> interface for convex hull computations.
singular	Enable the interface to <pkg>sci-mathematics/singular</pkg> for ideal related computations.

singular

Flag	Description
polymake	Enable the interface to TOPCOM

stp

Flag	Description
cryptominisat	Enable <pkg>sci-mathematics/cryptominisat</pkg> support

unuran

Flag	Description
prng	Use <pkg>sci-mathematics/prng</pkg> library
rngstreams	Use <pkg>sci-mathematics/rngstreams</pkg> library

why3

Flag	Description
re	Use Re (<pkg>dev-ml/re</pkg>) instead of Str for regular expressions
stackify	Enable structure reconstruction algorithm for MLCFG

why3-for-spark

Flag	Description
hypothesis-selection	Enable hypothesis selection

yices2

Flag	Description
mcsat	Enable support for MCSAT

z3

Flag	Description
isabelle	Add integration support for the Isabelle/HOL theorem prover.

sci-misc

nco

Flag	Description
ncap2	Build next generation netcdf arithmetic processor (needs <pkg>dev-java/antlr</pkg>)

sci-ml

XNNPACK

Flag	Description
memopt	Build with optimized memory allocation scheme

caffe2

Flag	Description
cusparselt	Use the CUDA/HIP Sparse Matrix Multiplication
distributed	Support distributed applications
fbgemm	Use <pkg>sci-ml/FBGEMM</pkg>
flash	Enable flash attention
gloo	Use <pkg>sci-ml/gloo</pkg>
kineto	Use<pkg>sci-ml/kineto</pkg>profiling library
memefficient	Enable mem efficient attention
nccl	Use <pkg>dev-libs/rccl</pkg> (NCCL compatible) backend for distributed operations
nnpack	Use <pkg>sci-ml/NNPACK</pkg>
onednn	Use <pkg>sci-ml/oneDNN</pkg>
qnnpack	Use QNNPACK
xnnpack	Use <pkg>sci-ml/XNNPACK</pkg>

datasets

Flag	Description
vision	Support vision

evaluate

Flag	Description
evaluator	Enable evaluator
template	Enable template

ggml

Flag	Description
avx512_vnni
avx512bw
avx512f
avx512vbmi
avx_vnni
bmi2
fma3

onnx

Flag	Description
disableStaticReg	Disable Static Registration

sci-physics

geant

Flag	Description
inventor	Add support for Open Inventor SGI toolkit via Coin3D
raytracerx	Enable raytracing for physics events
trajectories	Enable display of particle trajectories

geant4_vmc

Flag	Description
g4root	Build G4Root (interface for GEANT4 simulation with a ROOT geometry)
vgm	Enable the Virtual Geometry Model (<pkg>sci-physics/vgm</pkg>)

hepmc

Flag	Description
cm	Build with cm instead of default mm for length units
gev	Build with GeV instead of default MeV for momentum units

lammps

Flag	Description
lammps-memalign	Enables the use of the posix_memalign() call instead of malloc() when large chunks or memory are allocated by LAMMPS. Aliengnment is on 16 byte boundaries.

pythia

Flag	Description
hepmc2	Adds support for High Energy Physics Monte Carlo Generators 2 <pkg>sci-physics/hepmc</pkg>
mg5mes	MadGraph matrix element plugins for parton showers
mpich	Multi-threading support via <pkg>sys-cluster/mpich</pkg>

root

Flag	Description
davix	Enable support for DAVIX Data Management Client (https://cern.ch/davix)
minuit	Build ROOT's internal versions of minuit (fortran) and minuit2 (C++)
pythia8	Build the interface for <pkg>sci-physics/pythia</pkg> version 8.x
roofit	Build RooFit function fitting package
root7	Build experimental features to be released with ROOT 7
tmva	Built TMVA (ROOT's multi-variate analysis toolkit for machine learning)
unuran	Enable support for <pkg>sci-mathematics/unuran</pkg>
xrootd	Build the interface for <pkg>net-libs/xrootd</pkg>

vgm

Flag	Description
geant4	Enable interaction with Geant4(<pkg>sci-physics/geant</pkg>:4)

sci-visualization

dash

Flag	Description
compress	Use <pkg>dev-python/flask-compress</pkg> to save bandwidth
diskcache	Use <pkg>dev-python/diskcache</pkg> to cache on disk

fityk

Flag	Description
nlopt	Enable optimization with <pkg>sci-libs/nlopt</pkg>

gle

Flag	Description
manip	Build data manipulation program

gnuplot

Flag	Description
amos	Enable Amos routines for complex Airy and Bessel functions (<pkg>dev-libs/openspecfun</pkg>)
bitmap	Enable dot-matrix printers and pbm terminal
gpic	Include support for gpic terminal
metafont	Include support for metafont terminal
tgif	Include support for tgif terminal

gr

Flag	Description
agg	Enable the libagg anti-grain rendering engine

gwyddion

Flag	Description
unique	Enable remote control backend via <pkg>dev-libs/libunique</pkg>

labplot

Flag	Description
cantor	Enable support for different open-source computer algebra systems via <pkg>kde-apps/cantor</pkg>
origin	Enable support for reading OriginLab OPJ project files through <pkg>sci-libs/liborigin</pkg>

sec-policy

selinux-base

Flag	Description
ubac	Enable User Based Access Control (UBAC) in the SELinux policy
unknown-perms	Default allow unknown classes in kernels newer than the policy (SELinux policy capability).

sys-apps

busybox

Flag	Description
mdev	Create the appropriate symlink in /sbin and install mdev.conf and support files
sep-usr	Support a separate /usr without needing an initramfs by booting with init=/ginit

cpu-x

Flag	Description
cpu	Utiliser la bibliothèque <pkg>dev-libs/libcpuid</pkg> pour les informations liées au C.P.U.
force-libstatgrab	Utiliser <pkg>sys-libs/libstatgrab</pkg> à la place de <pkg>sys-process/procps</pkg>

firejail

Flag	Description
dbusproxy	Enable DBus proxying to filter access in supporting profiles
file-transfer	Enable file transfers between sandboxes and the host system
globalcfg	Enable global config file
private-home	Enable private home feature
userns	Enable attaching a new user namespace to a sandbox (--noroot option)

flashrom

Flag	Description
asm106x	Enable programmer for ASMedia SATA controllers
atahpt	Highpoint (HPT) ATA/RAID controller support
atapromise	Support for Promise PDC2026x (FastTrak/Ultra)
atavia	Support for VIA VT6421A SATA controllers
buspirate-spi	Enable Bus Pirate SPI programmer
ch341a-spi	Enable WCH CH341A SPI programmer
ch347-spi	Enable WCH CH347 SPI programmer
dediprog	Dediprog SF100 support
developerbox-spi	Enable Devloperbox SPI recovery support
digilent-spi	Enable support for Digilent iCEblink40 development board
dirtyjtag-spi	Support for DirtyJTAG (a USB-JTAG firmware for STM32 MCUs)
drkaiser	Enable Dr. Kaiser programmer
ft2232-spi	Enable ftdi programmer, flashing through FTDI/SPI USB interface
gfxnvidia	Enable NVIDIA programmer
internal	Enable internal/onboard support
internal-dmi	Enable internal DMI decoding rather than use <pkg>sys-apps/dmidecode</pkg>
it8212	Support for ITE IT8212F ATA/RAID controllers
jlink-spi	Support for SEGGER J-Link and compatible devices
linux-mtd	Enable support for Linux mtd SPI flash devices
linux-spi	Enable support for Linux userspace spidev interface
mediatek-i2c-spi	Support for Mediatek LCD controllers
mstarddc-spi	Support for SPI flash ROMs accessible through DDC in MSTAR-equipped displays
nic3com	Enable 3Com NIC programmer
nicintel	Support for Intel NICs
nicintel-eeprom	Support for EEPROMs on Intel Gigabit network cards
nicintel-spi	Support for SPI on Intel NICs
nicnatsemi	Support for National Semiconductor NICs
nicrealtek	Support for Realtek NICs
nv-sma-spi	Support for NVIDIA System Management Agent
ogp-spi	Enable support for OGP (Open Graphics Project) SPI flashing
parade-lspcon	Enable support for Parade lspcon USB-C to HDMI protocol translator
pickit2-spi	Support for SPI flash ROMs accessible via Microchip PICkit2
pony-spi	Enable support for SI-Prog like hardware by Lancos
raiden-debug-spi	Support for Chrome EC based debug tools - SuzyQable, Servo V4, C2D2 &amp; uServo
rayer-spi	RayeR SPIPGM hardware support
realtek-mst-i2c-spi	Enable support for Realtek RTD2142 MST
satamv	Enable programmer for Marvell SATA controllers
satasii	Enable programmer for SiI SATA controllers
serprog	Enable Serial Flasher programmer
spidriver	Enable programmer for Excamera Labs SPIDriver
stlinkv3-spi	Enable SPI programmer using STLINK-V3
usbblaster-spi	Enable support for Altera USB-Blaster dongles

fwupd

Flag	Description
amdgpu	Build and install AMD dGPU (Navi3x and above) plugin
cbor	Enable CBOR support for coSWID and uSWID via <pkg>dev-libs/libcbor</pkg>
flashrom	Enable flashrom plugin via <pkg>sys-apps/flashrom</pkg>
spi	Install Intel-SPI plugin
synaptics	Install synaptics plugin

gawk

Flag	Description
pma	Experimental Persistent Memory Allocator (PMA) support which allows persistence of variables, arrays, and user-defined functions across runs.

gentoo-wsl-config

Flag	Description
interop	Enable Windows interoperability features for WSL

gnome-disk-utility

Flag	Description
fat	Include FAT16/FAT32 support (<pkg>sys-fs/dosfstools</pkg>)

grep

Flag	Description
egrep-fgrep	Install deprecated 'egrep' and 'fgrep' wrappers for 'grep -E' and 'grep -F' respectively. GNU grep 3.8 onwards warns about their usage by default, but the versions installed by this flag do not. No deprecation warnings are emitted when this flag is enabled.
sparc

hwloc

Flag	Description
cpuid	Enable the cpuid-based architecture specific support (x86 component)

ipmitool

Flag	Description
openbmc	Enable OpenBMC D-Bus interface

irqbalance

Flag	Description
thermal	Enable support of thermal events via <pkg>sys-power/thermald</pkg>
tui	Enable build of irqbalance terminal user interface

kexec-tools

Flag	Description
booke	Include support for Book-E memory management

kmscon

Flag	Description
fbdev	Enable Linux FBDev for backend
libseat	Enable seat management via <pkg>sys-auth/seatd</pkg>

linux-misc-apps

Flag	Description
usbip	Include USB/IP binaries to replace <pkg>net-misc/usbip</pkg>

lm-sensors

Flag	Description
sensord	Enable sensord - a daemon that can be used to periodically log sensor readings from hardware health-monitoring chips

man-db

Flag	Description
manpager	Enable manpager wrapper for colorizing output

memtest86+

Flag	Description
bios32	Compile a BIOS-bootable 32bit memtest image
bios64	Compile a BIOS-bootable 64bit memtest image
iso32	Compile a 32bit ISO image
iso64	Compile a 64bit ISO image

net-tools

Flag	Description
arp	build the arp and rarp tools (for manipulating the ARP cache)
plipconfig	build the plipconfig tool (for working with old PLIP hardware)
slattach	build the slattach tool (for working with old serial ports)

nvme-cli

Flag	Description
pdc	Set default Persistent Discovery Controllers behavior

openrc

Flag	Description
netifrc	enable Gentoo's network stack (net.* scripts)
newnet	enable the new network stack (experimental)
s6	install s6-linux-init
sysvinit	control the dependency on sysvinit (experimental)

pcmciautils

Flag	Description
staticsocket	Add support for static sockets

portage

Flag	Description
gentoo-dev	Enable features required for Gentoo ebuild development.
rsync-verify	Enable full-tree cryptographic verification of Gentoo repository git or rsync checkouts using <pkg>app-portage/gemato</pkg>.

proot

Flag	Description
care	Build dynamic CARE binary (more info - https://proot-me.github.io)

rng-tools

Flag	Description
jitterentropy	Enable Jitter RNG entropy support
nistbeacon	Enable NIST beacon entropy support
qrypt	Enable qrypt beacon entropy support

roccat-tools

Flag	Description
input_devices_roccat_arvo	INPUT_DEVICES setting to build driver for Roccat Arvo input devices
input_devices_roccat_isku	INPUT_DEVICES setting to build driver for Roccat Isku input devices
input_devices_roccat_iskufx	INPUT_DEVICES setting to build driver for Roccat Isku Fx input devices
input_devices_roccat_kiro	INPUT_DEVICES setting to build driver for Roccat Kiro input devices
input_devices_roccat_kone	INPUT_DEVICES setting to build driver for Roccat Kone input devices
input_devices_roccat_koneplus	INPUT_DEVICES setting to build driver for Roccat Kone[+] input devices
input_devices_roccat_konepure	INPUT_DEVICES setting to build driver for Roccat Kone Pure input devices
input_devices_roccat_konepuremilitary	INPUT_DEVICES setting to build driver for Roccat Kone Pure Military input devices
input_devices_roccat_konepureoptical	INPUT_DEVICES setting to build driver for Roccat Kone Pure Optical input devices
input_devices_roccat_konextd	INPUT_DEVICES setting to build driver for Roccat KoneXTD input devices
input_devices_roccat_konextdoptical	INPUT_DEVICES setting to build driver for Roccat KoneXTD Optical input devices
input_devices_roccat_kova2016	INPUT_DEVICES setting to build driver for Roccat Kova 2016 input devices
input_devices_roccat_kovaplus	INPUT_DEVICES setting to build driver for Roccat Kova[+] input devices
input_devices_roccat_lua	INPUT_DEVICES setting to build driver for Roccat Lua input devices
input_devices_roccat_nyth	INPUT_DEVICES setting to build driver for Roccat Nyth input devices
input_devices_roccat_pyra	INPUT_DEVICES setting to build driver for Roccat Pyra input devices
input_devices_roccat_ryosmk	INPUT_DEVICES setting to build driver for Roccat RyosMK Pro input devices
input_devices_roccat_ryosmkfx	INPUT_DEVICES setting to build driver for Roccat RyosMK FX input devices
input_devices_roccat_ryostkl	INPUT_DEVICES setting to build driver for Roccat RyosMK Pro input devices
input_devices_roccat_savu	INPUT_DEVICES setting to build driver for Roccat Savu input devices
input_devices_roccat_skeltr	INPUT_DEVICES setting to build driver for Roccat Skeltr input devices
input_devices_roccat_sova	INPUT_DEVICES setting to build driver for Roccat Sova input devices
input_devices_roccat_suora	INPUT_DEVICES setting to build driver for Roccat Suora input devices
input_devices_roccat_tyon	INPUT_DEVICES setting to build driver for Roccat Tyon input devices

s390-tools

Flag	Description
abi_s390_32	32-bit (s390) libraries
pfm	build the cpacfstats tool

s6

Flag	Description
execline	enable support for <pkg>dev-lang/execline</pkg>

sandbox

Flag	Description
nnp	Enable NO_NEW_PRIVS which blocks set*id programs from gaining privileges (e.g. sudo)

smartmontools

Flag	Description
update-drivedb	Install a script to update the drivedb file.

systemd

Flag	Description
fido2	Enable FIDO2 support
imds	Enable IMDS (Instance Metadata Service)
importd	Enable import daemon

systemd-utils

Flag	Description
sysctl	Install systemd-sysctl and sysctl.d files
sysusers	Enable systemd-sysusers
tmpfiles	Enable systemd-tmpfiles

tcp-wrappers

Flag	Description
netgroups	Support matching NIS (host) netgroup names via the @netgroup syntax (if you don't know what this means, you most likely do not need it)

ugrep

Flag	Description
bzip3	Support for .bz3 files using <pkg>app-arch/bzip3</pkg>.

usbguard

Flag	Description
umockdev	Enables support for <pkg>dev-util/umockdev</pkg>

usbutils

Flag	Description
usbreset	additionally compile the potentially problematic usbreset util

util-linux

Flag	Description
cramfs	build mkfs/fsck helpers for cramfs filesystems
fdformat	build fdformat (floppy disk format)
tty-helpers	install the mesg/wall/write tools for talking to local users
uuidd	build uuidd daemon

sys-auth

libfprint

Flag	Description
tod	Build with patches for Touch OEM Drivers

nss-pam-ldapd

Flag	Description
pynslcd	Install the python implementation along with the standard implementation

pam_mktemp

Flag	Description
prevent-removal	If supported, set EXT2_APPEND_FL on /tmp/.private to prevent temporary directories from being removed

pambase

Flag	Description
mktemp	Enable pam_mktemp module on system auth stack for session handling. This module creates a private temporary directory for the user, and sets TMP and TMPDIR accordingly.
nullok	Enable the nullok option with the pam_unix module. This allows people to login with blank passwords.
pam_krb5	Enable pam_krb5 module on system auth stack, as an alternative to pam_unix. If Kerberos authentication succeeds, only pam_unix will be ignorde, and all the other modules will proceed as usual, including Gnome Keyring and other session modules. It requires <pkg>sys-libs/pam</pkg> as PAM implementation.
pam_ssh	Enable pam_ssh module on system auth stack for authentication and session handling. This module will accept as password the passphrase of a private SSH key (one of ~/.ssh/id_rsa, ~/.ssh/id_dsa or ~/.ssh/identity), and will spawn an ssh-agent instance to cache the open key.
pwhistory	Enable pam_pwhistory module on system auth stack to save the last passwords for each user in order to force password change history and keep the user from alternating between the same password too frequently.
securetty	Enable pam_securetty module in the login stack. Not generally relevant anymore as the login stack only refers to local logins and local terminals imply secure access in the first place.
sha512	Switch Linux-PAM's pam_unix module to use sha512 for passwords hashes rather than MD5. This option requires <pkg>sys-libs/pam</pkg> version 1.0.1 built against <pkg>sys-libs/glibc</pkg> version 2.7, if it's built against an earlier version, it will silently be ignored, and MD5 hashes will be used. All the passwords changed after this USE flag is enabled will be saved to the shadow file hashed using SHA512 function. The password previously saved will be left untouched. Please note that while SHA512-hashed passwords will still be recognised if the USE flag is removed, the shadow file will not be compatible with systems using an earlier glibc version.
turnstile	Use pam_turnstile module to register user sessions with turnstile.
yescrypt	Switch Linux-PAM's pam_unix module to use yescrypt for passwords hashes rather than MD5. Like with USE=sha512 (see that description), this only changes the default, and hashes with other types are still supported.

seatd

Flag	Description
builtin	Enable embedded server in libseat

ssh-ldap-pubkey

Flag	Description
schema	Install a copy of the LPK schema, only needed on LDAP servers.

sssd

Flag	Description
openid	Add support for login via OpenID Connect, such as Keycloak
passkey	Add support for FIDO2 passkeys"

sys-block

fio

Flag	Description
pandas	Install dependencies for complex python scripts
zbc	Enable ZBC &amp; ZAC disks via <pkg>sys-block/libzbc</pkg>.

libfabric

Flag	Description
efa	Enable Amazon EC2 Elastic Fabric Adapter provider
usnic	Enable Cisco VIC (virtualized NIC) hardware on Cisco UCS server provider
verbs	Enable Linux Infiniband verbs provider

nbdkit

Flag	Description
torrent	Enable the torrent plugin via <pkg>net-libs/libtorrent-rasterbar</pkg>.
zlib-ng	Use <pkg>sys-libs/zlib-ng</pkg> to handle zlib decompression.

partimage

Flag	Description
nologin	Do not include login support when connecting partimaged

sys-boot

grub

Flag	Description
coreboot
efi-32
efi-64
efiemu	Build and install the efiemu runtimes
emu
ieee1275
libzfs	Enable support for <pkg>sys-fs/zfs</pkg>
loongson
multiboot
pc
protect	Build and install the grub-protect utility
qemu-mips
uboot
xen-32
xen-pvh

lilo

Flag	Description
keytab	Install keytab, keyboard remapping helper script
pxeserial	Avoid character echo on PXE serial console

limine

Flag	Description
bios-cd	Enables legacy x86 BIOS boot support for CDs.
bios-pxe	Enables legacy x86 BIOS PXE boot support.
uefi-aarch64	Enable AArch64 UEFI support.
uefi-cd	Enable building limine-uefi-cd.bin using <pkg>sys-fs/mtools</pkg>.
uefi-ia32	Enable IA32 (32-bit x86) UEFI support.
uefi-loongarch64	Enable 64-bit LoongArch UEFI support.
uefi-riscv64	Enable 64-bit RISC-V UEFI support.
uefi-x86-64	Enable x86-64 UEFI support.

refind

Flag	Description
ext4	Construire le gestionnaire EFI pour le système de fichier ext4
hfs	Construire le gestionnaire EFI pour le système de fichier hfs
iso9660	Construire le gestionnaire EFI pour le système de fichier iso9660

silo

Flag	Description
tilo-only	Install only the tilo netboot tool

vboot-utils

Flag	Description
libzip	Use <pkg>dev-libs/libzip</pkg>.

sys-cluster

ceph

Flag	Description
cephfs	Build support for cephfs, a POSIX compatible filesystem built on top of ceph
diskprediction	Enable local diskprediction module to predict disk failures
dpdk	Enable DPDK messaging
grafana	Install grafana dashboards
mgr	Build the ceph-mgr daemon
nvmeof	Enable support for NVMEoF
pmdk	Enable PMDK libraries
radosgw	Add radosgw support
rbd-rwl	Enable librbd persistent write back cache
rbd-ssd	Enable librbd persistent write back cache for SSDs
rgw-lua	Rados Gateway's support for dynamically adding lua packagess
spdk	Enable SPDK user-mode storage driver toolkit
system-boost	Use system <pkg>dev-libs/boost</pkg> instead of the bundled one
zbd	Enable <pkg>sys-block/libzbd</pkg> bluestore backend

charliecloud

Flag	Description
ch-image	Build the internal builder ch-image (previously named ch-grow)

charm

Flag	Description
ampi	Build implementation of MPI on top of Charm++
charmdebug	Enable the charm debugger
charmproduction	Optimize performance of Charm++ runtime
charmtracing	Enable tracing support in Charm++
cmkopt	Enable CMK optimisation
mlogft	Compile with Charm++ message logging fault tolerance support
syncft	Compile with Charm++ fault tolerance support

cluster-glue

Flag	Description
ipmilan	Install the ipmilan plugin (requires <pkg>sys-libs/openipmi</pkg>)

corosync

Flag	Description
watchdog	Enable watchdog support

drbd-utils

Flag	Description
pacemaker	Enable Pacemaker integration

galera

Flag	Description
garbd	Install Galera Arbitrator - a stateless daemon which acts as a lightweight group member

glusterfs

Flag	Description
georeplication	Enable support for georeplication (requires <pkg>dev-lang/python</pkg>)

hpx

Flag	Description
papi	Use <pkg>dev-libs/papi</pkg> for NaCl
perftools	Use <pkg>dev-util/google-perftools</pkg> for memory allocation

kronosnet

Flag	Description
lzo2	Add support for lzo2 compression

legion

Flag	Description
gasnet	Enable GASNet lib support

lmod

Flag	Description
auto-swap	enable auto swapping of compiler
duplicate-paths	allow duplicate entries in path

mpich

Flag	Description
mpi-threads	Enable MPI_THREAD_MULTIPLE

nomad

Flag	Description
ui	do not embed the ui in the binary

openmpi

Flag	Description
cma	Enable the CMA (Cross Memory Attach) MCA
libompitrace	Enable support for contributed package libompitrace
openmpi_fabrics_knem	High-Performance Intra-Node MPI Communication
openmpi_fabrics_ofed	OFED RDMA stack (InfiniBand and iWARP)
openmpi_ofed_features_control-hdr-padding	Add padding bytes to the openib control header
openmpi_ofed_features_dynamic-sl	Enable openib BTL to query Subnet Manager for IB SL
openmpi_ofed_features_rdmacm	Enable Open Fabrics RDMACM support in openib BTL
openmpi_ofed_features_udcm	Enable Open Fabrics UDCM support in openib BTL
openmpi_rm_pbs	torque resource manager
openmpi_rm_slurm	slurm resource manager
peruse	Enable PERUSE interface

pmix

Flag	Description
pmi	Build PMI1 and PMI2 interface

rdma-core

Flag	Description
neigh	Enable iwpmd support

resource-agents

Flag	Description
rgmanager	Install resources for rgmanager

slurm

Flag	Description
multiple-slurmd	Allow multiple slurmd to run
ofed	Add Infiniband support via ofed
slurmdbd	Install SQL server for slurmdbd
slurmrestd	Enable interface to Slurm via REST API
torque	Enable perl scripts that emulates pbs (qstat, qsub etc.)

torque

Flag	Description
autorun	Enable the AUTORUN_JOBS codebase
cpusets	Enable pbs_mom to utilize linux cpusets if available
quickcommit	Enable the QUICKCOMMIT codebase

sys-devel

autogen

Flag	Description
libopts	install the libopts tarball (a few packages want this for developing)

crosstool-ng

Flag	Description
meson	Require <pkg>dev-build/meson</pkg>
ninja	Require <pkg>app-alternatives/ninja</pkg>
wget	Require <pkg>net-misc/wget</pkg>

gcc

Flag	Description
algol68	Build the Algol 68 frontend
cobol	Enable support for the COBOL programming language
d	Enable support for the D programming language
default-stack-clash-protection	Build packages with stack clash protection on by default as a hardening measure. This enables -fstack-clash-protection by default which protects against large memory allocations allowing stack smashing. May cause slightly increased codesize, but modern compilers have been adapted to optimize well for this case, as this mitigation is now quite common. See https://developers.redhat.com/blog/2020/05/22/stack-clash-mitigation-in-gcc-part-3 and https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt.
default-znow	Request full relocation on start from ld.so by default. This sets the -z,now (BIND_NOW) flag by default on all linker invocations. By resolving all dynamic symbols at application startup, parts of the program can be made read-only as a hardening measure. This is closely related to RELRO which is also separately enabled by default. In some applications with many unresolved symbols (heavily plugin based, for example), startup time may be impacted.
libgdiagnostics	Provide libgdiagnostics (https://gcc.gnu.org/wiki/libgdiagnostics). This also installs the 'sarif-replay' tool.
libssp	Build SSP support into a dedicated library rather than use the code in the C library (DO NOT ENABLE THIS IF YOU DON'T KNOW WHAT IT DOES)
modula2	Build the GCC Modula-2 language frontend.
objc	Build support for the Objective C code language
objc++	Build support for the Objective C++ language
objc-gc	Build support for the Objective C code language Garbage Collector
vtv	Build support for virtual table verification (a C++ hardening feature). This does not control whether GCC defaults to using VTV> Note that actually using VTV breaks ABI and hence the whole system must be built with -fvtable-verify.

gcc-config

Flag	Description
cc-wrappers	Install and manage 'cc' and 'f77' wrappers in /usr/bin. Otherwise ignore them.

sys-fabric

mstflint

Flag	Description
adb-generic-tools	Enable compiling the following tools: mstreg and mstlink
fw-mgr	Enable compiling the firmware manager tool: mstfwmanager
inband	Enable firmware updates for Mellanox SwitchX and ConnectIB devices

sys-firmware

alsa-firmware

Flag	Description
alsa_cards_aica	Sega Dreamcast audio driver
alsa_cards_asihpi	AudioScience ASIxxxx
alsa_cards_ca0132	Creative CA0132 (Sound Core3D) HD-audio
alsa_cards_cs46xx	Cirrus Logic (Sound Fusion) CS4280/CS461x/CS462x/CS463x
alsa_cards_darla20	(Echoaudio) Darla20
alsa_cards_darla24	(Echoaudio) Darla24
alsa_cards_echo3g	(Echoaudio) 3G cards
alsa_cards_emu1212	E-MU 1212M PCI
alsa_cards_emu1616	E-MU 1616 CardBus, 1616m CardBus, 1616 PCI
alsa_cards_emu1820	E-MU 1820M PCI
alsa_cards_gina20	(Echoaudio) Gina20
alsa_cards_gina24	(Echoaudio) Gina24
alsa_cards_indigo	(Echoaudio) Indigo
alsa_cards_indigoio	(Echoaudio) Indigo IO
alsa_cards_korg1212	Korg 1212 IO
alsa_cards_layla20	(Echoaudio) Layla20
alsa_cards_layla24	(Echoaudio) Layla24
alsa_cards_maestro3	ESS Allegro/Maestro3
alsa_cards_mia	(Echoaudio) Mia
alsa_cards_mona	(Echoaudio) Mona
alsa_cards_msnd-pinnacle	Turtle Beach MultiSound Pinnacle/Fiji driver
alsa_cards_wavefront	Turtle Beach Maui,Tropez,Tropez+ (Wavefront)
alsa_cards_ymfpci	Yamaha YMF724/740/744/754

intel-microcode

Flag	Description
hostonly	Only install ucode(s) supported by currently available (=online) processor(s)
split-ucode	Install the split binary ucode files (used by the kernel directly)

ipxe

Flag	Description
lkrn	Build a linux kernel bootable file for using with grub/etc...
undi	Build a Universal Network Device Interface driver chainloading your existing PXE NIC into iPXE

seabios

Flag	Description
seavgabios	Include SeaVGABIOS binaries (replacement for vgabios)

sys-fs

android-file-transfer-linux

Flag	Description
zune	Enable support for Microsoft Zune

btrfs-progs

Flag	Description
convert	Build ext2 conversion utility (btrfs-convert)

cryptmount

Flag	Description
argv0switch	Default action given by progname.
cswap	Enable support for encrypted swap.
fsck	Check filesystems before mounting.
luks	Enable key management via LUKS

dmraid

Flag	Description
intel-led	Enable Intel LED support
mini	Create a minimal binary suitable for early boot environments

ext4magic

Flag	Description
expert-mode	Builds ext4magic with expert mode. Highly useful in recovering data from a corrupted filesystem
file-attr	Enable the recovery of file attributes (append, immutable, nodump etc)

lessfs

Flag	Description
filelog	Enable the ability to log to a file instead of syslog
memtrace	Enable leefs to create a report regarding the memory allocation. This feature should be used for debugging purposes to avoid performance degradation

loop-aes

Flag	Description
extra-ciphers	Enable extra ciphers
keyscrub	Protects the encryption key in memory but takes more cpu resources

lvm2

Flag	Description
sanlock	Enable lvmlockd with support for sanlock
thin	Support for thin volumes
vdo	Support for Virtual Disk Optimizer (VDO)

mdadm

Flag	Description
corosync	Support for corosync cluster engine

mtd-utils

Flag	Description
ubifs	Build UBIFS tools

ntfs3g

Flag	Description
mount-ntfs	Install mount.ntfs symlink
ntfsdecrypt	Build and install the ntfsdecrypt application.
ntfsprogs	Enable ntfsprogs

zfs

Flag	Description
kernel-builtin	Disable dependency on <pkg>sys-fs/zfs-kmod</pkg> under the assumption that ZFS is part of the kernel source tree
test-suite	Install regression test suite

zfs-auto-snapshot

Flag	Description
default-exclude	Only take snapshots of datasets with com.sun:auto-snapshot=true property set

sys-kernel

dracut

Flag	Description
dracut-cpio	Build the enhanced 'dracut-cpio' program

hurd

Flag	Description
lwip	Build alternative userland TCP/IP stack lwIP, from <pkg>net-libs/lwip</pkg>.
rumpkernel	Build <pkg>sys-kernel/rumpkernel</pkg> support which provides drivers from NetBSD run in userland. This is needed for 64-bit systems and is considered the future of driver and hardware support on Hurd.

installkernel

Flag	Description
efistub	EXPERIMENTAL: Update UEFI configuration on each kernel installation
refind	Install a Gentoo icon for rEFInd alongside the (unified) kernel image, used icon is overridable with REFIND_ICON env var
systemd-boot	Use systemd-boot's native layout by default
ugrd	Generate an initramfs using UGRD on each kernel installation
uki	Install UKIs to ESP/EFI/Linux for EFI stub booting and/or bootloaders with support for auto-discovering UKIs

kpatch

Flag	Description
kpatch	Enable a command-line tool which allows a user to manage a collection of patch modules.
kpatch-build	Enable tools which convert a source diff patch to a patch module.

linux-firmware

Flag	Description
unknown-license	Install firmware files whose license is unknown

mips-sources

Flag	Description
ip27	Enables additional support for SGI Origin (IP27)
ip28	Enables additional support for SGI Indigo2 Impact R10000 (IP28)
ip30	Enables support for SGI Octane (IP30, 'Speedracer')

rt-sources

Flag	Description
deblob	Remove binary blobs from kernel sources to provide libre license compliance.

udev-hid-bpf

Flag	Description
userhacks	Build HID-BPF programs which affect user-subjective preferences for device behavior.

sys-libs

binutils-libs

Flag	Description
64-bit-bfd	Support 64-bit targets even on 32-bit hosts (is ignored on 64-bit hosts)

freeipmi

Flag	Description
without-root	Configure whether or not to check for root access in ipmi tools.

glibc

Flag	Description
clone3	Enable the new clone3 syscall within glibc. Can be disabled to allow compatibility with older Electron applications.
compile-locales	build *all* locales in src_install; this is generally meant for stage building only as it ignores /etc/locale.gen file and can be pretty slow
experimental-loong	Add experimental LoongArch patchset
hash-sysv-compat	enable sysv linker hashes in glibc for compatibility with binary software (EAC via wine/proton)
multiarch	enable optimizations for multiple CPU architectures (detected at runtime)
multilib-bootstrap	Provide prebuilt libgcc.a and crt files if missing. Only needed for ABI switch.
nscd	Build, and enable support for, the Name Service Cache Daemon
sframe	enable building with sframe backtrace support
static-pie	Enable static PIE support (runtime files for -static-pie gcc option).

libblockdev

Flag	Description
escrow	Support for building crypto plugin with escrow device support

libunwind

Flag	Description
debug-frame	Adds support for DWARF .debug_frame section: Use the information from this section if available

libxcrypt

Flag	Description
system	Install as system libcrypt.so rather than to an alternate directory (will collide with <pkg>sys-libs/glibc</pkg>'s version)

musl

Flag	Description
${IUSE/+crypt/+crypt}

newlib

Flag	Description
nano	Build additional newlib-nano library

timezone-data

Flag	Description
leaps-timezone	Install the set of "right" timezones; these timezones include leap seconds when counting seconds since the epoch (while POSIX does not) as they are based on the TAI (International Atomic Time) clock
zic-slim	Default to 'slim' file format for /usr/share/zoneinfo. Otherwise 'fat' format is used. Not all programs can handle 'slim' format'.

zlib-ng

Flag	Description
arm_{crc32,neon}
ppc_{altivec,vsx2,vsx3}
x86_{avx2,avx512f,avx512_vnni,sse2,ssse3,sse4_1,sse4_2,pclmul,vpclmulqdq}
x86_{avx2,avx512f,avx512_vnni,sse2,ssse3,sse4_2,pclmul,vpclmulqdq}

sys-power

nut

Flag	Description
gpio	Includes all UPS drivers that use GPIO.
i2c	Includes all UPS drivers that use I2C.

power-profiles-daemon

Flag	Description
zsh-completion	Enable zsh completion support

tlp

Flag	Description
rdw	Enables TLP Radio Device Wizard feature

sys-process

bottom

Flag	Description
battery	Include support for laptop battery information

criu

Flag	Description
setproctitle	Use <pkg>dev-libs/libbsd</pkg> to make process titles of service workers to be more verbose

cronie

Flag	Description
anacron	Install the periodic anacron command scheduler.

fcron

Flag	Description
system-crontab	Set up fcron to respect /etc/crontab and /etc/cron.d. If this flag is disabled, /etc/cron.d and /etc/crontab will be ignored, but /etc/cron.{hourly,daily,weekly,monthly} will still be respected. Also this creates /usr/bin/crontab symlink.

htop

Flag	Description
delayacct	Enable Linux delay accounting support via <pkg>dev-libs/libnl</pkg>
openvz	Enable openvz support
vserver	Enable vserver support

nvtop

Flag	Description
video_cards_panfrost	VIDEO_CARDS setting to build driver for Mali 600/700/800 video cards
video_cards_panthor	VIDEO_CARDS setting to support for Mali 10th video cards

procps

Flag	Description
modern-top	Enables new startup defaults of top. Keeps old defaults if disabled
skill	Build the skill and snice programs

systemd-cron

Flag	Description
cron-boot	Include support for the boot timer.
etc-crontab-systemd	Use dedicated /etc/crontab-systemd instead of parsing /etc/crontab
minutely	Support /etc/cron.minutely
runparts	Use traditional run-parts instead of creating jobs for each cron.* entry
setgid	Compile setgid C helper for crontab. Needs GCC or Clang.
yearly	Support /etc/cron.yearly

tini

Flag	Description
args	Enable argument parsing.

virtual

mpi

Flag	Description
nullmpi	Allow <pkg>sys-cluster/nullmpi</pkg> a minimal incomplete MPI implementation as a provider

www-apache

mod_nss

Flag	Description
ecc	enable Elliptical Curve Cyptography

mod_security

Flag	Description
mlogc	Build and install the ModSecurity Audit Log Collector (mlogc).

pwauth

Flag	Description
domain-aware	Ignore leading domain names in username (Windows compat)
faillog	Log failed login attempts
ignore-case	Ignore string case in username (mostly Windows compat)

www-apps

drupal

Flag	Description
uploadprogress	Install <pkg>dev-php/pecl-uploadprogress</pkg> package

gitea

Flag	Description
acct	User and group management via acct-*/git packages
gogit	(EXPERIMENTAL) Use go-git variants of Git commands.

hugo

Flag	Description
extended	Enable SASS/SCSS support

icingaweb2

Flag	Description
apache2-server	Adds support for the apache2-server

icingaweb2-module-director

Flag	Description
php_targets_php8-5	Build against PHP 8.5

moodle

Flag	Description
${AUTHENTICATION_MODES//,/
${DB_TYPES//,/
vhosts	Add support for installing web-based applications into a virtual-hosting environment

postfixadmin

Flag	Description
vacation	Install vacation.pl script and dependencies

redmine

Flag	Description
minimagick	Enable image processing support via <pkg>dev-ruby/mini_magick</pkg>
passenger	Enable support for <pkg>www-apache/passenger</pkg>

roundup

Flag	Description
jinja	Enable Jinja2 support
pyjwt	Enable jwt tokens for login
tz	Enable full support of timezone
whoosh	Enable Whoosh full-text indexer

wordpress

Flag	Description
akismet	Installs Akismet comment spam plug-in

xpra-html5

Flag	Description
minify	Minify JavaScript code for smaller transfers

www-client

chromium

Flag	Description
bundled-toolchain	Download and use the upstream binary toolchain(s) to build Chromium
hangouts	Enable support for Google Hangouts features such as screen sharing
official	Enable Official build instead of Developer build.
system-zstd	Use system <pkg>app-arch/zstd</pkg> instead of the bundled one.

dillo

Flag	Description
xembed	Enable XEmbed protocol support

elinks

Flag	Description
gemini	Enable support for the gemini protocol
libcss	Enable support for cascading style sheets via <pkg>dev-libs/libcss</pkg>

firefox

Flag	Description
llvm_slot_21	Use LLVM 21.
wasm-sandbox	Sandbox certain third-party libraries through WebAssembly using RLBox

jd

Flag	Description
migemo	Enable migemo support for Japanese

netsurf

Flag	Description
rosprite	RISC OS Sprite bitmap image support via <pkg>media-libs/librosprite</pkg>
svgtiny	Use <pkg>media-libs/libsvgtiny</pkg> instead of <pkg>gnome-base/librsvg</pkg> for SVG support

qutebrowser

Flag	Description
adblock	Enable Brave's ABP-style adblocker library for improved adblocking

seamonkey

Flag	Description
chatzilla	Build Mozilla's IRC client (default on)
system-{av1,harfbuzz,icu,jpeg,libevent,libvpx,png,sqlite}

surf

Flag	Description
tabbed	Install surf-open.sh script for running surf in <pkg>x11-misc/tabbed</pkg>

uget

Flag	Description
aria2	Enable support for <pkg>net-misc/aria2</pkg> through xmlrpc. You'll find the plugin in the app's settings.

w3m

Flag	Description
lynxkeymap	If you prefer Lynx-like key binding

www-nginx

ngx-set-misc

Flag	Description
hmac	Enable support for generating HMAC digests using <pkg>dev-libs/openssl</pkg>

www-plugins

lightspark

Flag	Description
nsplugin	Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser)
ppapi	Install the PPAPI plugin (for Chromium)

passff-host

Flag	Description
chrome	Install plugin for chrome (which also includes opera)
firefox	Install plugin for firefox
vivaldi	Install plugin for vivaldi

www-servers

apache

Flag	Description
suexec	Install suexec with apache
suexec-caps	Install suexec with capabilities instead of SUID
suexec-syslog	Log suexec to syslog instead of to a separate file

caddy

Flag	Description
dns-alidns	Adds module which allows to manage Aliyun DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.alidns
dns-azure	Adds module which allows to manage Azure hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.azure
dns-cloudflare	Adds module which allows to manage Cloudflare hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.cloudflare
dns-cloudns	Adds module which allows to manage ClouDNS hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.cloudns
dns-digitalocean	Adds module which allows to manage DigitalOcean hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.digitalocean
dns-duckdns	Adds module which allows to manage Duck DNS hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.duckdns
dns-dynv6	Adds module which allows to manage Dynv6 hosted DNS zones using Caddy
dns-gandi	Adds module which allows to manage Gandi hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.gandi
dns-godaddy	Adds module which allows to manage Godaddy hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.godaddy
dns-googleclouddns	Adds module which allows to manage Google Cloud hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.googleclouddns
dns-he	Adds module which allows to manage Hurricane Electric hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.he
dns-hetzner	Adds module which allows to manage Hetzner hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.hetzner
dns-huaweicloud	Adds module which allows to manage Huawei Cloud hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.huaweicloud
dns-linode	Adds module which allows to manage Linode hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.linode
dns-mailinabox	Adds module which allows to manage Mail-in-a-Box hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.mailinabox
dns-namecheap	Adds module which allows to manage Namecheap hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.namecheap
dns-netcup	Adds module which allows to manage netcup hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.netcup
dns-netlify	Adds module which allows to manage Netlify hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.netlify
dns-oraclecloud	Adds module which allows to manage Oracle cloud hosted DNS zones using Caddy https://github.com/caddy-dns/oraclecloud
dns-ovh	Adds module which allows to manage OVHcloud hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.ovh
dns-porkbun	Adds module which allows to manage porkbun hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.porkbun
dns-powerdns	Adds module which allows to manage DNS zones of <pkg>net-dns/pdns</pkg> using Caddy https://caddyserver.com/docs/modules/dns.providers.powerdns
dns-rfc2136	Adds module which allows to manage DNS zones using RFC2136 Dynamic Updates within Caddy https://caddyserver.com/docs/modules/dns.providers.rfc2136
dns-route53	Adds module which allows to manage AWS route53 hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.route53
dns-unifi	Adds module which allows to manage UniFi networks DNS zones using Caddy https://github.com/caddy-dns/unifi
dns-vultr	Adds module which allows to manage Vultr hosted DNS zones using Caddy https://caddyserver.com/docs/modules/dns.providers.vultr
dynamicdns	Adds module which allows querying an endpoint to get dynamic public IP and updating records with DNS providers https://caddyserver.com/docs/modules/dynamic_dns
events-handlers-exec	Adds module which lets user exec command on Caddy events https://caddyserver.com/docs/modules/events.handlers.exec https://caddyserver.com/docs/caddyfile/options#event-options

fnord

Flag	Description
auth	Enable HTTP authentication support

h2o

Flag	Description
libh2o	Build and install libh2o
mruby	Enable support for mruby

kore

Flag	Description
acme	Add support for ACME

nginx

Flag	Description
http-cache	Enable HTTP cache support
nginx_mo
nginx_modules_http_addition	Add support for adding contents of other locations before and after the current location's content
nginx_modules_http_dav	Add support for the WebDAV functionality and methods: PUT, DELETE, MKCOL, COPY and MOVE
nginx_modules_http_rewrite	Add support for changing the request URI using PCRE regular expressions, returning redirects, and conditionally selecting configurations
nginx_modules_http_spdy	Add support for an SPDY implementation. (Deprecated, use USE="nginx_modules_http_v2" instead)
nginx_modules_http_stub_status	Add support for providing access to basic status information
nginx_modules_http_xslt	Add support for transforming XML responses using one or more XSLT stylesheets

sniproxy

Flag	Description
rfc3339	Use RFC3339 timestamp format in log.

tomcat

Flag	Description
extra-webapps	Build also the docs and examples webapp

uwsgi

Flag	Description
${LANG_SUPPORT_EXTENDED[@]}
${LANG_SUPPORT_SIMPLE[@]}
mo
routing	Enable routing support
uwsgi_plugins_corerouter	Base request routing internal mechanism
yajl	Use <pkg>dev-libs/yajl</pkg> instead of <pkg>dev-libs/jansson</pkg> for parsing JSON configuration files (if USe=json is set)

x11-apps

igt-gpu-tools

Flag	Description
chamelium	Enables support for building Chamelium tests
overlay	Build the intel-gpu-overlay utility
runner	Build the test runner
tests	Build and install tests

xdpyinfo

Flag	Description
dmx	Builds support for Distributed Multiheaded X <pkg>x11-base/xorg-server</pkg>

xinit

Flag	Description
twm	Control dependencies on legacy apps (xterm, twm, ...). Safe to disable if you use a modern desktop environment.

x11-base

xorg-drivers

Flag	Description
input_devices_elographics	INPUT_DEVICES setting to build driver for elographics input devices
input_devices_evdev	INPUT_DEVICES setting to build driver for evdev input devices
input_devices_synaptics	INPUT_DEVICES setting to build driver for synaptics input devices
input_devices_vmmouse	INPUT_DEVICES setting to build driver for vmmouse input devices
input_devices_void	INPUT_DEVICES setting to build driver for void/dummy input devices
video_cards_ast	VIDEO_CARDS setting to build driver for ASpeedTech video cards
video_cards_dummy	VIDEO_CARDS setting to build driver for dummy video cards
video_cards_fbdev	VIDEO_CARDS setting to build driver for fbdev video cards
video_cards_geode	VIDEO_CARDS setting to build driver for AMD Geode GX and LX video cards
video_cards_i915	VIDEO_CARDS setting to build driver for Intel i915 video cards
video_cards_mga	VIDEO_CARDS setting to build driver for mga video cards
video_cards_qxl	VIDEO_CARDS setting to build driver for qxl (QEMU virtual GPU)
video_cards_r128	VIDEO_CARDS setting to build driver for ATI r128 video cards
video_cards_siliconmotion	VIDEO_CARDS setting to build driver for siliconmotion video cards
video_cards_tegra	VIDEO_CARDS setting to build driver for tegra video cards
video_cards_vc4	VIDEO_CARDS setting to build driver for vc4 video cards

xorg-server

Flag	Description
xephyr	Build the Xephyr server
xnest	Build the Xnest server
xorg	Build the Xorg X server (HIGHLY RECOMMENDED)
xvfb	Build the Xvfb server

x11-drivers

nvidia-drivers

Flag	Description
kernel-open	Use the open source variant of the drivers (only works for Turing/Ampere or newer GPUs, aka GTX 1650+ -- recommended with >=560.xx drivers if usable and is *required* for 50xx Blackwell or newer GPUs -- always-enabled regardless of USE in >=595.xx)
persistenced	Install the persistence daemon for keeping devices state when unused (e.g. for headless)
powerd	Install the NVIDIA dynamic boost support daemon (only useful with specific laptops, ignore if unsure)

xf86-video-geode

Flag	Description
ztv	Enable building the V4L2 ZTV driver

xf86-video-intel

Flag	Description
sna	Enable SandyBridge's New Acceleration (useful on all chipsets, not just SandyBridge)
uxa	Enable UMA Acceleration Architecture

xf86-video-qxl

Flag	Description
xspice	Include Xspice, a standard X server that is also a Spice server

x11-libs

agg

Flag	Description
gpc	Enable gpc polygon clipper library

libdlo

Flag	Description
test-program	Build the program for testing Displaylink devices.

motif

Flag	Description
xcursor	Add support for cursors (<pkg>x11-libs/libXcursor</pkg>)

pango

Flag	Description
libthai	Support Thai line-breaking with <pkg>dev-libs/libthai</pkg>

pixman

Flag	Description
loongson2f	Enable Loongson2f MMI optimizations.

qwt

Flag	Description
polar	Install the QwtPolar headers

x11-misc

bumblebee

Flag	Description
bbswitch	Add dependency on <pkg>sys-power/bbswitch</pkg> for PM feature

clipmenu

Flag	Description
fzf	Use fzf as default launcher
rofi	Use rofi as default launcher

colord

Flag	Description
argyllcms	Enable ArgyllCMS sensor
extra-print-profiles	Generate extra print profiles. Warning: significant build time and memory requirements.

dunst

Flag	Description
completions	Install shell completions (for bash, fish and zsh)
dunstify	Build dunstify (notify-send alternative)

grub2-theme-preview

Flag	Description
grub_platforms_efi-32	EFI 32 bit platform support (Old MACs)
grub_platforms_efi-64	EFI 64 bit platform support
grub_platforms_pc	PC platform support

light-locker

Flag	Description
dpms	Turn on the display on screensaver deactivation.
screensaver	Lock the screen on screensaver activation.

mugshot

Flag	Description
libreoffice	Add support for <pkg>app-office/libreoffice</pkg> and <pkg>app-office/libreoffice-bin</pkg>

polybar

Flag	Description
i3wm	Add support for i3 window manager

primus

Flag	Description
libglvnd	Use <pkg>media-libs/libglvnd</pkg> for dispatch

read-edid

Flag	Description
vbe-mode	Build get-edid with support for legacy, VBE-based interface. Requires <pkg>dev-libs/libx86</pkg>.

rofi

Flag	Description
drun	Enable desktop file run dialog
windowmode	Enable normal window mode

rss-glx

Flag	Description
quesoglc	Enable support for OpenGL Character Renderer

spacefm

Flag	Description
video-thumbnails	Support video thumbnails with <pkg>media-video/ffmpegthumbnailer</pkg>

stalonetray

Flag	Description
graceful-exit	use non-portable hack to exit gracefully on signal

tint2

Flag	Description
tint2conf	Build/Install tint2conf as well

x11vnc

Flag	Description
xdamage	Enable support for the Xdamage library
xfixes	Enable support for the Xfixes library

xkbd

Flag	Description
xi	Enable XInput2 support through <pkg>x11-libs/libXi</pkg>

xlockmore

Flag	Description
vtlock	Enables support for virtual terminal locking
xlockrc	Enables xlockrc for people without PAM

xmobar

Flag	Description
datezone	Enables localized date support.
rtsopts	Use -with-rtsopts=-V0 to reduce wakeups.
uvmeter	UVMeter only useful to australians.

xscreensaver

Flag	Description
gdm	Use gdmflexiserver from <pkg>gnome-base/gdm</pkg> instead of <pkg>x11-misc/lightdm</pkg>
logind-idle-hint	Send the session idle hint to logind once the screen saver blanks
new-login	Enable user switching support using gdmflexiserver (<pkg>x11-misc/lightdm</pkg>)

xsr

Flag	Description
cursor	Capture mouse cursor using <pkg>x11-misc/xdotool</pkg>, and place them on the screenshots using <pkg>media-gfx/imagemagick</pkg>

yabar

Flag	Description
playerctl	Uses <pkg>media-sound/playerctl</pkg> to retrieve the name of the currently played song

zim

Flag	Description
ubuntu-mono	Install mono icons for Unity

x11-plugins

e16-epplets

Flag	Description
cdaudio	Enable CD Audio support using <pkg>media-libs/libcdaudio</pkg>
libgtop	Use <pkg>gnome-base/libgtop</pkg> to obtain system load information

pidgin-mbpurple

Flag	Description
twitgin	Enable graphical plugin for Gtk+ interface of Pidgin.

pidgin-sipe

Flag	Description
ocs2005-message-hack	Disable message timeout for OCS2005 clients which causes "false" not delivered error messages

x11-terms

ghostty

Flag	Description
adwaita	Use <pkg>gui-libs/libadwaita</pkg> for better GNOME integration

mlterm

Flag	Description
brltty	Enable support for <pkg>app-accessibility/brltty</pkg>
uim	Enable support for <pkg>app-i18n/uim</pkg>

rxvt-unicode

Flag	Description
24-bit-color	Enable 24-bit color support. Note that this feature is unofficial, may cause visual glitches due to the fact there is no termcap/terminfo definition for rxvt-unicode-24bit yet so it is necessary to use the one for 256 colours, visibly increases memory usage, and might slow urxvt down dramatically when more than six fonts are in use in a terminal instance.
256-color	Enable 256 color support
blink	Enable blinking text
fading-colors	Enable colors fading when off focus
font-styles	Enable support for bold and italic fonts
iso14755	Enable ISO-14755 support
mousewheel	Enable scrolling via mouse wheel or buttons 4 and 5
unicode3	Use 21 instead of 16 bits to represent unicode characters
wide-glyphs	Enable support for wide glyphs, required for certain symbol/icon fonts to display correctly. Note that this feature is *unofficial* and has been observed to cause stability issues for some users.

xterm

Flag	Description
openpty	Use openpty() in preference to posix_openpt()

x11-themes

arc-theme

Flag	Description
transparency	Enable transparency

comix-xcursors

Flag	Description
lefthanded	Install lefthanded version of theme in addition to default one.
opaque	Install non-transparent version of theme in addition to default one.

fluent-icon-theme

Flag	Description
round	Install the round version of symbolic icons

gentoo-artwork

Flag	Description
pixmaps	Install pixmaps

gtk-engines-murrine

Flag	Description
animation-rtl	Progressbar animation from right to left

kfaenza

Flag	Description
additional	Install additional KFaenza icons. See third homepage for details

x11-wm

e16

Flag	Description
editline	Use <pkg>dev-libs/editline</pkg> for line editing
libhack	Build libhack window mode helper library
no-container	Do not use container window (experimental)
xi2	Enable the experimental multipointer input XInput2. This incldues the MultiPointer X feature
xsm	Enable X Session Management support using <pkg>x11-libs/libSM</pkg>
xsync	Enable X Sync support
zoom	Support resolution change of current window (zoom) using<pkg>x11-libs/libXxf86vm</pkg> (xvidtune)

fluxbox

Flag	Description
slit	Enables the Fluxbox slit (or dock)

musca

Flag	Description
apis	Optionally install the experimental `apis' window manager
xlisten	Optionally install the xlisten utility

mutter

Flag	Description
devkit	Enable support for running a nested wayland session

ratpoison

Flag	Description
history	Use <pkg>sys-libs/readline</pkg> for history handling
sloppy	Install sloppy, a focus-follows-mouse implementation for ratpoison

windowmaker

Flag	Description
modelock	Enable XKB language status lock support. README says: "If you don't know what it is you probably don't need it."

wmfs

Flag	Description
imlib2	Enable image support through <pkg>media-libs/imlib2</pkg>

xmonad

Flag	Description
no-autorepeat-keys	Allow ignoring of keyboard autorepeat.

xpra

Flag	Description
csc	Enable csc softscaler support
mdns	Enable Multicast DNS via <pkg>dev-libs/mdns</pkg>

xfce-base

libxfce4ui

Flag	Description
system-info	Enable system information in xfce4-about.

thunar

Flag	Description
trash-panel-plugin	Build the trash status indicator plugin for the XFCE panel

tumbler

Flag	Description
odf	Enable support for .odf thumbnailers by using <pkg>gnome-extra/libgsf</pkg>

xfce4-meta

Flag	Description
remote-fs	Install the <pkg>x11-misc/gigolo</pkg> frontend to manage remote filesystem connections.
search	Install the <pkg>dev-util/catfish</pkg> search tool frontend.

xfce4-panel

Flag	Description
dbusmenu	Enable <pkg>dev-libs/libdbusmenu</pkg> integration (in status notifier plugin)

xfce4-power-manager

Flag	Description
panel-plugin	Build the power management plugin for the XFCE panel

xfce4-settings

Flag	Description
xklavier	Enable keyboard layout selection support using <pkg>x11-libs/libxklavier</pkg>

---