Global USE flags

Flag	Description	Packages
X	Enable X11 sandboxing	4
acl		2
apache2		2
berkdb		3
cgi		2
clang	Use Clang compiler instead of GCC	4
client	Build and install tensile_client executable to run benchmarks and tune GPU GEMM	3
cpu_flags_arm_neon		2
cpu_flags_x86_avx		2
cpu_flags_x86_sse2		2
crypt		2
cuda		2
curl	Use curl for http,https and ftp backends	5
debug	Enables debug information	19
doc	Enable building of the PCP books	11
emacs		3
etcd	Enable etcd support	2
examples		4
firewalld	Enables support for manage firewall	2
fuse	Clipboard with FUSE file copy support	3
gdbm		2
gnutls		3
icu		2
iodbc		2
ipmi	Enable IPMI things	2
ipv6	Use IPv6 by default, requires libtirpc	7
jit		3
json	Customizable performance metrics exporter tool from PCP to JSON	3
kerberos		4
ldap		6
libedit		2
libvirt	Support managing virtual machines with <pkg>app-emulation/libvirt</pkg>.	2
monitor	Build the Python and GUI dependent monitor applications	2
mysql		8
nginx	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from Nginx	2
numa	Enable NUMA support using <pkg>sys-process/numactl</pkg> (NUMA kernel support is also required)	2
odbc	Enable ODBC and SQL backend options	2
opencl	Build vendored OpenCL runtime	3
pam		2
perl		2
pie	Build programs as Position Independent Executables (a security hardening technique)	2
postgres	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics about the PostgreSQL database	9
profile		3
python		2
radius		4
redis	Support returning data to a redis database.	4
rocm	Build <pkg>dev-libs/rocr-runtime</pkg> offloading support for AMD GPUs.	2
sasl		3
selinux		13
server	Build the loki server	3
session		3
snmp	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from SNMP	3
sodium	Use <pkg>dev-libs/libsodium</pkg>	2
sqlite		5
ssl		10
static-libs		4
syslog		2
systemd		7
tcpd		3
test	Perform rocblas-test to compare the result between rocBLAS and system BLAS	41
tools	Build the loki tools logcli and loki-canary	2
unwind		3
usb	Includes all UPS drivers that use USB.	2
valgrind		3
video_cards_amdgpu		2
video_cards_nvidia		2
vulkan		2
wayland	Run in wayland mode under wayland sessions, xwayland otherwise. This flag doesn't affect x11 sessions.	4
webp	Enable webp support for GD in php-7.x	2
xml	Includes all UPS drivers that use XML.	5
zstd		4

Category USE flags

llvm-runtimes

Flag	Description	Packages
ompt	Enable OpenMP Tools Interface support	2

net-misc

Flag	Description	Packages
pulseaudio		2

Local USE flags

app-admin

cockpit

Flag	Description
networkmanager
pcp	Enables support for system performance and analysis
tuned	Enables support for change performance profiles
udisks

loki

Flag	Description
promtail	Build the promtail log gathering agent

salt

Flag	Description
cheetah	Enable support for <pkg>dev-python/cheetah3</pkg>
genshi	Enable support for <pkg>dev-python/genshi</pkg>
keyring
libcloud	Enable salt-cloud support via libcloud.
mako	Add support for using the mako template engine for parsing salt states.
mongodb	Support returning data to a mongodb server.
nova	Enable support for the OpenStack Nova API
portage	Add support for package state enforcement using <pkg>sys-apps/portage</pkg>
raet	Add support for the new RAET transport.
test-full	Run additional, quite slow tests.
vim-syntax
zeromq	Add support for the zeromq transport.

app-backup

wal-g

Flag	Description
brotli
fdb	Enable FoundationDB support
gp	Enable GreenplumDB support
lzo
mongo	Enable MongoDB support
sqlserver	Enable MSSQL support

app-forensics

aide

Flag	Description
audit
e2fs	Enable support for checking file attributes on ext2/ext3/ext4 filesystems
nettle	Add support for digest using Nettle
xattr

app-metrics

pcp

Flag	Description
activemq	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from ActiveMQ
bind	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from BIND via its REST interface
discovery	Support discover PCP services on the network
infiniband	Support for inifiniband metrics
influxdb	Customizable performance metrics exporter tool from PCP to InfluxDB
nutcracker	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from NutCracker (TwemCache)
perfevent	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from hardware performance counters using the Linux kernel perf_event API
podman	Enable PCP Performance Metrics Domain Agent (PMDA) for collecting metrics from podman
qt5
ssp	Build programs with stack smashing protector
threads
xls	Customizable performance metrics exporter tool from PCP to XLSX

app-misc

claude-desktop-bin

Flag	Description
egl	Use EGL for smooth rendering on high refresh rate monitors

zigbee2mqtt

Flag	Description
homeassistant	Use homeassistant

app-office

obsidian

Flag	Description
appindicator

dev-db

keydb

Flag	Description
flash	KeyDB FLASH is built on RocksDB and is persistent to the storage medium it is written to. It is still considered to be a Beta feature (experimental) and should be treated as such.

mongodb

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

dev-lang

php

Flag	Description
${IUSE}
argon2	Enable password hashing algorithm from <pkg>app-crypt/argon2</pkg>
bcmath	Add support for libbcmath
bzip2
calendar
cdb
cjk
cli	Enable CLI SAPI
ctype	Enable ctype functions
embed	Enable embed SAPI
enchant	Add supports Enchant spelling library.
exif
ffi	Add foreign function interface (ffi extension) support
fileinfo	Add fileinfo extension support
filter	Add filter extension support
firebird
flatfile	Add dbm support for flat files
fpm	Enable the FastCGI Process Manager SAPI
ftp
gd	Adds support for gd (bundled with PHP)
gmp
hash	Enable the hash extension
iconv
imap
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
lmdb	Enable support for <pkg>dev-db/lmdb</pkg> db backend
mhash
mssql
mysqli
nls
oci8-instant-client
opcache	Enables built-in opcode cache, replacing pecl-apc et al.
pcntl	Add support for process creation functions
pdo	Enable the bundled PDO extensions
phar	Enables the phar extension to provide phar archive support
phpdbg	Enable the PHP Debug Command Line SAPI (like gdb for php)
posix
qdbm
readline
recode
session-mm	Include <pkg>dev-libs/mm</pkg> support for session storage
sharedmem	Add support for shared memory use
simplexml	Support for SimpleXML
soap
sockets
spell
sybase-ct	Add support for Sybase-CT
sysvipc	Support for System V-compatible inter-process communication
tidy
tokenizer	Add support for the PHP file parser
tokyocabinet	Enable support for <pkg>dev-db/tokyocabinet</pkg> db backend
truetype
unicode
vpx	Enable webp support for GD in php-5.x
wddx	Add support for Web Distributed Data eXchange
xmlreader	Enable XMLReader support
xmlrpc
xmlwriter	Enable XMLWriter support
xpm
xslt	Enable the XSL extension
zip
zlib

dev-libs

xdna-driver

Flag	Description
compress-xz	Compress firmware using xz (<pkg>app-arch/xz-utils</pkg>) before installation
compress-zstd	Compress firmware using zstd (<pkg>app-arch/zstd</pkg>) before installation

dev-php

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)
mmap

pecl-http

Flag	Description
curl_ssl_gnutls
curl_ssl_openssl

pecl-redis

Flag	Description
igbinary	Enables igbinary serialisation support
lz4

dev-util

claude-code

Flag	Description
cpu_flags_x86_avx2

hip

Flag	Description
hip	Build HIP runtime

phpstorm

Flag	Description
30bits	Support on 30 bits color display. (https://youtrack.jetbrains.com/issue/IDEA-241795/Not-working-on-30-bit-color-displays)

semgrep-core

Flag	Description
ocamlopt

llvm-core

clang

Flag	Description
extra	Build extra tools (clangd, clang-tidy and a few more)
ieee-long-double	Use accelerated 128-bit IEEE long double ABI (ppc64le only)
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
cet	Enable support for control flow hijacking protection. On amd64, this provides Intel Control Flow Enforcement Technology (CET). Only provides benefits on newer CPUs. For Intel, the CPU must be at least as new as Tiger Lake. For AMD, it must be at least as new as Zen 3. This is harmless on older CPUs, but provides no benefit either.
default-compiler-rt	Use compiler-rt + libunwind instead of libgcc as the default rtlib for clang
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.
default-lld	Use lld as the default linker for clang
hardened
llvm-libunwind

llvm

Flag	Description
binutils-plugin	Build the binutils plugin
debuginfod	Install llvm-debuginfod (requires <pkg>net-misc/curl</pkg> and <pkg>dev-cpp/cpp-httplib</pkg>)
exegesis	Enable performance counter support for llvm-exegesis tool that can be used to measure host machine instruction characteristics
libffi
z3	Enable support for <pkg>sci-mathematics/z3</pkg> constraint solver

llvm-runtimes

compiler-rt

Flag	Description
abi_x86_32
abi_x86_64
atomic-builtins	Compile atomic builtins into compiler-rt.builtins. This is needed on systems without GCC/libatomic, but requires using Clang to build.

offload

Flag	Description
llvm_targets_AMDGPU
llvm_targets_NVPTX

openmp

Flag	Description
gdb-plugin	Build OMPD GDB plugin
hwloc	Enable CPU affinity support via hwloc
level-zero	Build <pkg>dev-libs/level-zero</pkg> offloading support for Intel GPUs.
offload	Support offloading OpenMP using libomptarget

mail-mta

exim

Flag	Description
arc	Adds support for Authenticated Receive Chain (ARC)
dane	Adds support for DNS-based Authentication of Named Entities
dcc	Adds support for Distributed Checksum Clearinghouse (DCC)
dkim	Adds support for DomainKeys Identified Mail (DKIM)
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
dovecot-sasl	Adds support for Dovecot's authentication
dsn	Adds support for Delivery Status Notifications (DSN)
gsasl
idn
lmtp	Adds support for lmtp
maildir
mbx	Adds support for UW's mbx format
nis
pkcs11	Require pkcs11 support in <pkg>net-libs/gnutls</pkg> with USE=gnutls
prdr	Adds support for Per-Recipient Data Response
proxy	Add support for being behind a proxy, such as HAProxy
socks5
spf	Adds support for Sender Policy Framework
srs	Adds support for Sender Rewriting Scheme
tdb	Use <pkg>sys-libs/tdb</pkg> for internal database storage (such as hints database)
tpda	Adds support for Transport Post-Delivery Actions

media-fonts

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)
otf	Install Open Type Font (OTF) (required for HarfBuzz backend)
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-libs

mesa

Flag	Description
llvm	Enable LLVM backend for Gallium3D.
lm-sensors	Enable Gallium HUD lm-sensors support.
opengl
proprietary-codecs	Enable codecs for patent-encumbered audio and video formats.
sysprof	Enable profiling data capture support using <pkg>dev-util/sysprof-capture</pkg>
vaapi
video_cards_
video_cards_nouveau

media-video

davinci-resolve-studio

Flag	Description
bundled-libs	Use bundled libraries.
developer	Include developer examples and documentation.

net-analyzer

librenms

Flag	Description
amqp	Enable support for AMQP alert transport

smokeping

Flag	Description
dig	Install <pkg>net-dns/bind-tools</pkg> for dig functionality

net-firewall

firehol

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

net-misc

freerdp

Flag	Description
aad	Enable login via Azure AD
alsa
cups
ffmpeg
gstreamer
jpeg
openh264	Enable H.264 support using <pkg>media-libs/openh264</pkg>
sdl
smartcard
xinerama
xv

guacamole-server

Flag	Description
encode
kubernetes	Support connecting to Kubernetes server
print	Support for printing in RDP
rdp
ssh	enable support for SSH protocol
telnet	enable support for telnet protocol
vnc
vorbis

openvswitch

Flag	Description
xdp	Enable support eXpress Data Path (Experimental)

net-nds

openldap

Flag	Description
cxx
experimental	Enable experimental backend options
kinit	Enable support for kerberos init
minimal	Build libraries & userspace tools only. Does not install any server code
overlays	Enable contributed OpenLDAP overlays
pbkdf2	Enable support for pbkdf2 passwords
samba
sha2	Enable support for pw-sha2 password hashes
smbkrb5passwd	Enable overlay for syncing ldap, unix and lanman passwords

net-vpn

cloudflare-warp

Flag	Description
gui

nebula

Flag	Description
gencert	Install the certificate generator

nebula-mesh

Flag	Description
agent	Build the nebula-agent daemon that runs on each Nebula host and polls the management server for updates
mgmt	Build the nebula-mgmt management server (HTTP API, web UI and CLI)

sci-libs

gsl

Flag	Description
cblas-external	Link gsl with external cblas provided by (<pkg>virtual/cblas</pkg>) instead of shipped internal version
deprecated	Enable deprecated functions

hipBLAS

Flag	Description
rocsolver	Add additional functions from <pkg>sci-libs/rocSOLVER</pkg>

rocBLAS

Flag	Description
benchmark	Build and install rocblas-bench
hipblaslt	Build with <pkg>sci-libs/hipBLASLt</pkg> for some non-batched and strided batched problems on gfx12
roctracer	Enable roctracer (roctx) marker

rocWMMA

Flag	Description
"(
${IUSE_TARGETS[*]}
(
)
)"
gfx1100
gfx1101
gfx1102
gfx1150
gfx1151
gfx1152
gfx1153
gfx1200
gfx1201
gfx908
gfx90a
gfx942
gfx950

sci-misc

llama-cpp

Flag	Description
blis	Build a BLIS backend
flexiblas	Build a FlexiBLAS backend
hip-graphs	Use HIP graphs to batch kernel launches (HIP backend only). Off by default: with ROCm 10 it slows token generation by ~30% on RDNA4
openblas	Build an OpenBLAS backend
openmp
openssl	Use openssl to support HTTPS
vmm	Use HIP virtual memory management for the device memory pool (HIP backend only)

sys-apps

drm_info

Flag	Description
pci	Print PCI device names via libpci

firejail

Flag	Description
apparmor	Enable support for custom AppArmor profiles
chroot	Enable chrooting to custom directory
contrib	Install contrib scripts
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
network	Enable networking features
private-home	Enable private home feature
userns	Enable attaching a new user namespace to a sandbox (--noroot option)

sys-block

thin-provisioning-tools

Flag	Description
io-uring	Enable experimental support for io-uring.

sys-cluster

drbd-utils

Flag	Description
udev
xen	Enable Xen integration

glusterfs

Flag	Description
georeplication	Enable support for georeplication (requires <pkg>dev-lang/python</pkg>)
libtirpc	Build against <pkg>net-libs/libtirpc</pkg> for RPC support
lto	Build using Link Time Optimizations (LTO)
rsyslog	Install configuration snippet for <pkg>app-admin/rsyslog</pkg>
tcmalloc
uring	Control whether or not glusterfs is compiled with uring support or not.

patroni

Flag	Description
s3	Add support for AWS services

sys-libs

libnbd

Flag	Description
go	Build bindings for <pkg>dev-lang/go</pkg>
ocaml

sys-power

nut

Flag	Description
gpio	Includes all UPS drivers that use GPIO.
i2c	Includes all UPS drivers that use I2C.
man
modbus	Includes all UPS drivers that use MODBUS.
serial	Includes all UPS drivers that use SERIAL.
zeroconf

www-apps

guacamole-client

Flag	Description
sso	Single-Sign-On authentication
totp	TOTP two-factor authentication

healthchecks

Flag	Description
${PYTHON_REQUIRED_USE}
apache	Install Apache required applications
apprise	Allow backup monitoring to send notification to a wide variety of services, using <pkg>dev-python/apprise</pkg>

redmine

Flag	Description
fastcgi
imagemagick
minimagick	Enable image processing support via <pkg>dev-ruby/mini_magick</pkg>
passenger	Enable support for <pkg>www-apache/passenger</pkg>
pdf
standalone	Enable standalone mode with <pkg>www-servers/puma</pkg>

www-misc

awstats

Flag	Description
geoip2	Enable GeoIP2 API from MaxMind

www-servers

varnish

Flag	Description
jemalloc

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