Global USE flags

Flag	Description	Packages
acl		2
apache2		2
bindist	Disable/Restrict EC algorithms (as they seem to be patented) -- note: changes the ABI	3
branding		2
caps	Build against <pkg>sys-libs/libcap-ng</pkg> to allow smartd to drop its privileges.	2
crypt		2
curl	If enabled, <pkg>net-misc/curl</pkg> is used thorugh the libcurl library; if it's not, the curl command is used instead. Some features are only available when using the library, but using it as library requires matching SSL implementations.	2
debug		11
doc	Generate and install API documentation for the package.	10
examples		4
fpm	Enable the FastCGI Process Manager SAPI	2
ftp	Enable FTP support	2
gmp		2
gnutls	Enable gnutls ssl backend	2
gtk3	Enable support for <pkg>x11-libs/gtk+</pkg>:3	2
imap	Enable Internet Message Access Protocol support	2
introspection		3
ipv6		9
kerberos		3
ldap	Build backend which enables default mail accounts, addressbooks and calendars for Evolution to be configured using each user's LDAP entry."	6
libressl		6
nls		6
nss	Use Mozilla NSS (<pkg>dev-libs/nss</pkg>) as hash library; if this is disabled, <pkg>dev-libs/openssl</pkg> is used instead.	3
postgres		2
readline		4
samba		2
selinux		6
snmp		2
spell		2
ssl	Enable crypto engine support (via openssl if USE='-gnutls -nss')	7
sslv3	Support for the old/insecure SSLv3 protocol -- note: not required for TLS/https	2
static		4
static-libs		11
systemd		7
test		17
threads		2
webp		2
zlib		2

Category USE flags

dev-libs

Flag	Description	Packages
asm		2
python		2

sys-kernel

Flag	Description	Packages
deblob	Remove binary blobs from kernel sources to provide libre license compliance.	2

Local USE flags

app-office

libreoffice

Flag	Description
$(printf
${LO_EXTS})
${PYTHON_REQUIRED_USE}
'
'libreoffice_extensions_%s
accessibility
base	Enable full support for LibreOffice Base databases (involves additional bundled libs)
bluetooth
coinmp	Use <pkg>sci-libs/coinor-mp</pkg> as alternative solver
cups
custom-cflags
dbus
eds
googledrive	Enable support for remote files on Google Drive
gstreamer
gtk4	Enable support for <pkg>gui-libs/gtk</pkg>:4
java
kde
mariadb	Prefer mariadb connector over mysql connector
odk	Build the Office Development Kit
pdfimport	Enable PDF import via the Poppler library
qt6
valgrind
vulkan	Enable Vulkan usage via the skia library (clang recommended)
wayland	Enable wayland support

libreoffice-l10n

Flag	Description
l10n_
offlinehelp

wps-office

Flag	Description
pulseaudio

dev-embedded

urjtag

Flag	Description
ftd2xx
ftdi
usb

dev-lang

php

Flag	Description
${IUSE}
apparmor
argon2
avif
bcmath	Add support for libbcmath
berkdb
bzip2
calendar
cdb
cgi
cjk
cli	Enable CLI SAPI
coverage	Include gcov symbols for test coverage and lcov reports. Only useful for extension developers, and requires GCC.
ctype	Enable ctype functions
embed	Enable embed SAPI
enchant	Add supports Enchant spelling library.
exif
ffi
fileinfo	Add fileinfo extension support
filter	Add filter extension support
firebird
flatfile	Add dbm support for flat files
gd	Adds support for gd (bundled with PHP)
gdbm
hash	Enable the hash extension
iconv
inifile	Add dbm support for .ini files
intl	Enables the intl extension for extended internalization support
iodbc
jit
json	Enable JSON support
ldap-sasl	Add SASL support for the PHP LDAP extension
libedit
lmdb
mhash
mssql
mysql
mysqli
oci8-instant-client
odbc
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
posix
qdbm
recode
session
session-mm
sharedmem	Add support for shared memory use
simplexml	Support for SimpleXML
soap
sockets
sodium
sqlite
sysvipc	Support for System V-compatible inter-process communication
tidy
tokenizer	Add support for the PHP file parser
tokyocabinet
truetype
unicode
vpx
wddx	Add support for Web Distributed Data eXchange
xml
xmlreader	Enable XMLReader support
xmlrpc
xmlwriter	Enable XMLWriter support
xpm
xslt	Enable the XSL extension
zip

dev-libs

liborcus

Flag	Description
spreadsheet-model
tools

openssl

Flag	Description
cpu_flags_x86_sse2
fips	Enable FIPS provider
ktls	Enable support for Kernel implementation of TLS (kTLS)
rfc3779	Enable support for RFC 3779 (X.509 Extensions for IP Addresses and AS Identifiers)
sctp
sslv2	Support for the old/insecure SSLv2 protocol -- note: not required for TLS/https
tls-compression	Enable support for discouraged TLS compression
tls-heartbeat	Enable the Heartbeat Extension in TLS and DTLS
vanilla
verify-sig
weak-ssl-ciphers	Build support for SSL/TLS ciphers that are considered "weak"

dev-php

ffmpeg-php

Flag	Description
libav

pecl-PDO_DBLIB

Flag	Description
abi_x86_32
abi_x86_64
abi_x86_x32

gnome-base

gconf

Flag	Description
policykit

gnome-vfs

Flag	Description
zeroconf

orbit

Flag	Description
pic	Force libname-server-2 to be built as PIC; needed on hardened systems

mail-client

sylpheed

Flag	Description
oniguruma	Use <pkg>dev-libs/oniguruma</pkg> for regular expression
xface

mate-base

caja

Flag	Description
mate	Install <pkg>x11-themes/mate-icon-theme</pkg> which is needed when this package is used in the MATE desktop environment.
xmp

mate-control-center

Flag	Description
accountsservice	Add support for AccountsService

net-analyzer

pinger

Flag	Description
gtk2	Install the gtkpinger GUI utility based on <pkg>x11-libs/gtk+</pkg>:2
ncurses

net-im

silc-client

Flag	Description
perl

net-mail

dbmail

Flag	Description
jemalloc
sieve	Enable sieve filter support

net-misc

curl

Flag	Description
adns
alt-svc	Enable alt-svc support
brotli	Enable brotli compression support
curl_ssl_gnutls
curl_ssl_libressl
curl_ssl_mbedtls
curl_ssl_nss
curl_ssl_openssl
curl_ssl_winssl
elibc_Winnt
gopher	Enable Gopher protocol support
hsts	Enable HTTP Strict Transport Security
http2	Enable HTTP/2.0 support
idn
mbedtls	Enable mbedtls ssl backend
metalink	Enable metalink support
nghttp3	Enable HTTP/3.0 support using <pkg>net-libs/nghttp3</pkg> and <pkg>net-libs/ngtcp2</pkg>
openssl	Enable openssl ssl backend
pop3	Enable Post Office Protocol 3 support
progress-meter	Enable the progress meter
quiche	Enable HTTP/3.0 support using <pkg>net-libs/quiche</pkg>
rtmp	Enable RTMP Streaming Media support
smtp	Enable Simple Mail Transfer Protocol support
ssh	Enable SSH urls in curl using libssh2
telnet	Enable Telnet protocol support
tftp	Enable TFTP support
winssl	Enable winssl ssl backend
zstd	Enable zstd compression

quagga

Flag	Description
bgpclassless
elibc_glibc
multipath
nhrpd
ospfapi
pam
protobuf
tcp-zebra

sys-apps

man-db

Flag	Description
manpager	Enable manpager wrapper for colorizing output
seccomp

smartmontools

Flag	Description
daemon	Install the monitoring daemon (smartd) and associated scripts.
mail
update-drivedb	Install a script to update the drivedb file.

sys-cluster

fence-agents

Flag	Description
libvirt

util-vserver

Flag	Description
beecrypt	Use dev-libs/beecrypt for cryptography
dietlibc	Compile against dev-libs/dietlibc

sys-fs

eudev

Flag	Description
kmod	enable module loading through libkmod
rule-generator	install legacy rule generator rules and support scripts - note that the functionality within was dropped from <pkg>sys-fs/udev</pkg> as it is not stable in all cases; use at your own risk
split-usr

libudev-zero

Flag	Description
hotplug

lvm2

Flag	Description
lvm	Build all of LVM2, not just device-mapper
lvm2create-initrd	Install lvm2create_initrd script and pull in <pkg>sys-apps/makedev</pkg> for the /sbin/MAKEDEV command
sanlock	Enable lvmlockd with support for sanlock
thin	Support for thin volumes
udev

www-client

dillo

Flag	Description
gif
jpeg
png
xembed	Enable X11 XEmbed support

x11-drivers

xf86-video-fbturbo

Flag	Description
gles2

---