Global USE flags

Flag	Description	Packages
X	Enable ximagesink and xvimagesink plugins; build GLX platform support if USE=opengl is enabled; build x11 windowing system support if USE=egl is enabled	15
alsa		6
aqua		2
bzip2	Enable bzip2 encoder/decoder plugin	3
caps		2
cpu_flags_x86_avx		3
cpu_flags_x86_f16c		2
cpu_flags_x86_sse2		5
cuda	Enable NVIDIA Cuda computations support (Experimental!)	6
custom-cflags		2
dbus		3
debug		10
doc		15
examples	Install source code examples	10
ffmpeg		5
fftw		3
fonts	Enable fonts support for appstream-builder.	2
gdk-pixbuf	Support image types other than PNG	3
gif		3
gles2	Enable GLES2 support	4
gstreamer		2
gtk-doc		4
gui	Build iv	3
hardened		2
hip	Build OIDN with AMD HIP support.	2
iconv		2
introspection		9
jack		4
jpeg		6
jpeg2k		4
lapack		2
large-stack	Enables code to take advantage of large stack support	2
llvm	Build with LLVM backend and extensions enabled.	2
man		3
mkl	Use <pkg>sci-libs/mkl</pkg> for blas, lapack and sparse blas routines	2
nls		4
ogg		3
opencl	Enable the Rusticl Gallium OpenCL state tracker.	3
openexr		3
opengl	Enable OpenGL library and plugin via desktop OpenGL API	5
openmp		4
openvdb	Enable OpenVDB support via <pkg>media-gfx/openvdb</pkg>	2
oss		2
pango	Enable Pango support using <pkg>x11-libs/pango</pkg>	2
perl		2
png		3
portaudio		2
pulseaudio	Enable support for audio capture via PulseAudio	7
python	Enable support for Python API bindings	6
qt6		3
raw		2
readline		2
screencast		2
sdl		2
selinux		5
sndfile		2
ssl	Enable HTTPS support.	3
static-libs		6
svg		2
sysprof	Enable profiling data capture support using <pkg>dev-util/sysprof-capture</pkg>	2
tbb	Enable multithreading with the Intel Threads Building Block (<pkg>dev-cpp/tbb</pkg>)	2
test	Build the test programs (requires <pkg>sys-libs/zlib</pkg>)	35
threads		4
tiff		5
tools	Build svg viewer tool	3
truetype		3
udev		4
utils	Build several binary tools for verifying and manipulating EXR files.	2
vala		2
valgrind		3
video	Allow access to GPU during tests run	2
vorbis		2
vulkan		4
wayland	Enable Wayland EGL windowing system support (requires egl and at least one of gles2 or opengl)	10
webp		3
xml	use libxml2 for XML support, instead of a custom minimalistic support	2
xxhash	Enable <pkg>dev-libs/xxhash</pkg> support for hashing muxer	2
zlib	Support the zlib format	3
zstd		2

Category USE flags

media-gfx

Flag	Description	Packages
postscript		2

media-libs

Flag	Description	Packages
(		2
aom	Enable support for the AOM codec encoding and decoding	2
cpu_flags_arm_neon		2
cpu_flags_x86_mmx		2
cpu_flags_x86_sse		2
gles1	include OpenGL ES 1.0 support	2
libsamplerate		2
orc	Disable some PaX memory protections to allow plugins that use <pkg>dev-lang/orc</pkg> for runtime optimization to be used on hardened PaX systems	3
rav1e	Enable support for the rav1e codec encoding	2
unwind	Enable <pkg>sys-libs/libunwind</pkg> usage for better backtrace support in leaks tracer module	2
vaapi		3
video_cards_intel	Enable Video Acceleration API for hardware decoding for Intel cards	2

Local USE flags

app-arch

libdeflate

Flag	Description
gzip	Support the gzip format

app-benchmarks

glmark2

Flag	Description
drm	Enable DRM backend support

app-shells

fish

Flag	Description
split-usr

dev-db

mysql-connector-c

Flag	Description
ldap

dev-libs

bemenu

Flag	Description
ncurses

gobject-introspection

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

protobuf

Flag	Description
emacs

re2

Flag	Description
benchmark	Build a benchmark binary, install it as re2-bench
icu
test-full	Run additional, quite slow tests

dev-qt

qtwebengine

Flag	Description
bindist
designer	Install the QWebEngineView plugin used to add widgets in <pkg>dev-qt/designer</pkg> forms that display web pages.
geolocation
jumbo-build	Combine source files to speed up build process.
kerberos
pdfium	Build the QtPdf module based on chromium's PDFium library
qml	Build QML/QtQuick bindings and imports
system-icu	Use the system-wide <pkg>dev-libs/icu</pkg> instead of bundled.
system-re2	Use the system-wide <pkg>dev-libs/re2</pkg> instead of bundled.
webdriver	Build tool for automated testing (ChromeDriver equivalent)
widgets	Enable QtWidgets support

dev-util

nvidia-cuda-toolkit

Flag	Description
debugger	Install the CUDA debugger
nsight	Install profiling and optimizing tools (nsight-compute, nsight-systems)
profiler	Install the NVIDIA CUDA profiler (nvprof) and the related libraries
rdma	Enable infiniband support via <pkg>sys-cluster/rdma-core</pkg>
sanitizer	Install compute-sanitizer tool
vis-profiler	Install the NVIDIA CUDA visual profiler (nvvp)

dev-vcs

git

Flag	Description
blksha1	Use the new optimized SHA1 implementation
cgi	Install gitweb too
curl	Support fetching and pushing (requires webdav too) over http:// and https:// protocols
cvs
gpg	Pull in gnupg for signing -- without gnupg, attempts at signing will fail at runtime!
highlight	GitWeb support for <pkg>app-text/highlight</pkg>
keyring
mediawiki	Support pulling and pushing from MediaWiki
pcre
perforce	Add support for Perforce version control system (requires manual installation of Perforce client)
safe-directory	Respect the safe.directory setting
subversion	Include git-svn for <pkg>dev-vcs/subversion</pkg> support
tk	Include the 'gitk' and 'git gui' tools
webdav	Adds support for push'ing to HTTP/HTTPS repositories via DAV
xinetd

games-emulation

snes9x

Flag	Description
libretro	Build libretro port
netplay	Enable playing ROMs over the network (not recommended)
xinerama
xv

gui-libs

gtk

Flag	Description
broadway	Enable the GDK Broadway backend.
cloudproviders	Enable GtkPlacesSidebar to access cloud services
colord	Use <pkg>x11-misc/colord</pkg> for color management in printing
cups

mail-client

aerc

Flag	Description
notmuch	Enable support for <pkg>net-mail/notmuch</pkg>

media-gfx

blender

Flag	Description
alembic
bullet
collada
color-management
cycles
cycles-bin-kernels
embree
experimental
fluid
gmp
gnome
jemalloc
nanovdb
ndof
oidn
openal
openpgl
opensubdiv
optix
osl
pdf
potrace
pugixml
renderdoc

imagemagick

Flag	Description
corefonts	Use <pkg>media-fonts/corefonts</pkg> which is required by some commands
cxx
djvu
fontconfig
fpx	Enable <pkg>media-libs/libfpx</pkg> support
graphviz
hdri	Enable High Dynamic Range Images formats
heif
jbig
jpegxl
lcms
lqr	Enable experimental liquid rescale support using <pkg>media-libs/liblqr</pkg>
lzma
q32	Set quantum depth value to 32
q8	Set quantum depth value to 8
wmf
zip

inkscape

Flag	Description
cdr	Enable support for CorelDRAW files via <pkg>media-libs/libcdr</pkg>
dia	Enable DIA flow chart import via <pkg>app-office/dia</pkg>
exif
graphicsmagick
imagemagick
inkjar	Enable support for OpenOffice.org SVG jar files
sourceview	Enable syntax highlighting support via <pkg>x11-libs/gtksourceview</pkg>
spell
svg2	Enable support for new SVG2 features
visio	Enable support for Microsoft Visio diagrams via <pkg>media-libs/libvisio</pkg>
wpg	Enable support for WordPerfect graphics via <pkg>app-text/libwpg</pkg>

media-libs

aubio

Flag	Description
blas
double-precision	Compile in double precision mode.

dav1d

Flag	Description
10bit	Add support for building 10-bit and 12-bit AV1.
8bit	Add support for decoding 8-bit AV1.
asm

gst-plugins-bad

Flag	Description
vnc
webrtc	Enable WebRTC audio/video network bin plugin

gst-plugins-base

Flag	Description
egl
gbm	Enable Graphics Buffer Manager based EGL windowing system support (requires egl and at least one of gles or opengl)
ivorbis	Enable integer based vorbis decoder
theora

libaom

Flag	Description
${IUSE}
cpu_flags_arm_crc32
cpu_flags_ppc_vsx

libavif

Flag	Description
dav1d	Enable support for the dav1d codec decoding
extras	Build extra apps (avifenc, avifdec) and test files
libyuv	Enable fast YUV conversion via libyuv
svt-av1	Enable support for the SVT-AV1 encoder

libheif

Flag	Description
go	Enable building <pkg>dev-lang/go</pkg> code/examples
x265	Use <pkg> media-libs/x265</pkg> for HEIF encoding

libsdl2

Flag	Description
cpu_flags_ppc_altivec
cpu_flags_x86_3dnow
cpu_flags_x86_sse3
fcitx4	Enable support for <pkg>app-i18n/fcitx</pkg> 4
haptic	Enable the haptic (force feedback) subsystem
ibus	Enable support for <pkg>app-i18n/ibus</pkg>
joystick	Control joystick support (disable at your own risk)
kms	Build the KMSDRM video driver
nas
pipewire	Enable support for the <pkg>media-video/pipewire</pkg> audio backend
sndio	Enable support for the <pkg>media-sound/sndio</pkg> backend
sound	Control audio support (disable at your own risk)
xscreensaver

lv2

Flag	Description
plugins	Enables examples plugins.

mesa

Flag	Description
d3d9	Enable Direct 3D9 API through Nine state tracker. Can be used together with patched wine.
lm-sensors	Enable Gallium HUD lm-sensors support.
osmesa	Build the Mesa library for off-screen rendering.
proprietary-codecs	Enable codecs for patent-encumbered audio and video formats.
vdpau	Enable the VDPAU acceleration interface for the Gallium3D Video Layer.
video_cards_
video_cards_nouveau
video_cards_r300
video_cards_r600
video_cards_radeonsi
video_cards_vmware
vulkan-overlay	Build vulkan-overlay-layer which displays Frames Per Second and other statistics
xa	Enable the XA (X Acceleration) API for Gallium3D.
zink	Enable the Zink OpenGL-over-Vulkan Gallium driver

oidn

Flag	Description
apps	Build the standalone denoise, self test, and benchmark binaries.
openimageio	Enable OpenImageIO Support

opencv

Flag	Description
atlas	Use <pkg>sci-libs/atlas</pkg> for blas, lapack and sparse blas routines
avif
contrib	Install user contributed scripts from opencv_contrib (Experimental!)
contribcvv	Enable CVV in contrib (requires Qt5)
contribdnn	Enable DNN module contrib (requires tinydnn)
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
cudnn	Enable support for nVidia cuDNN library
dnnsamples	Enable dnn caffeemodel samples
eigen	Enable usage of <pkg>dev-cpp/eigen</pkg> for computations
features2d	Enable features2d module
gdal	Enable support for <pkg>sci-libs/gdal</pkg> library
gflags	Use Google's C++ argument parsing library (<pkg>dev-cpp/gflags</pkg>)
glog	Use Google's C++ logging library (<pkg>dev-cpp/glog</pkg>)
gphoto2
gtk3	Enable <pkg>x11-libs/gtk+</pkg>:3 support
ieee1394
jasper	Use <pkg>media-libs/jasper</pkg> for jpeg2k support
java
non-free	Enable non-free components
opencvapps	Enable compilation with opencvapps
qt5
quirc	Enable qrcode decoding via <pkg>media-libs/quirc</pkg>
tesseract	Use Google's OCR Engine
testprograms	Build and install programs for testing OpenCV (performance)
v4l
vtk	Build new 3D visualization module viz based on <pkg>sci-libs/vtk</pkg>
xine

openimageio

Flag	Description
"(
)
)"
aes:aes
avx2:avx2
avx512f:avx512f
avx:avx
dicom	Enable DICOM medical image file support via <pkg>sci-libs/dcmtk</pkg>
f16c:f16c
fits	Enable support for NASA's <pkg>sci-libs/cfitsio</pkg> library
opencv	Enable OpenCV support via <pkg>media-libs/opencv</pkg>
ptex	Enable Ptex texture mapping system file support via <pkg>media-libs/ptex</pkg>
sse2:sse2
sse3:sse3
sse4_1:sse4.1
sse4_2:sse4.2
ssse3:ssse3

media-sound

audacity

Flag	Description
audiocom	Enable integrated uploading to audio.com
flac
id3tag	Enable ID3 tagging via <pkg>media-libs/libid3tag</pkg>
ladspa
lv2	Add support for Ladspa V2
mpg123	Use <pkg>media-sound/mpg123-base</pkg> instead of <pkg>media-libs/libmad</pkg> for MPEG decoding
opus
portmixer	Enable the internal portmixer feature
sbsms	Enable slower, more accurate pitch and tempo changing via <pkg>media-libs/libsbsms</pkg>
twolame	Enable twolame support (MPEG Audio Layer 2 encoder) via <pkg>media-sound/twolame</pkg>
vamp	Enable vamp plugins support (Audio analysing plugins)
wavpack

lmms

Flag	Description
fltk
fluidsynth	Enables Fluidsynth MIDI software synthesis plugin.
libgig	Enables GIG player plugin.
mp3
soundio	Enables libsoundio support.
stk	Enables STK Mallet plugin.
vst	Enables the VeSTige plugin to run VST plugins through Wine.

net-im

telegram-desktop

Flag	Description
enchant	Use the <pkg>app-text/enchant</pkg> spell-checking backend instead of <pkg>app-text/hunspell</pkg>
libdispatch	Use <pkg>dev-libs/libdispatch</pkg> to speed up concurrent code execution
webkit

viber

Flag	Description
abi_x86_64
apulse	Поддержка эмуляции PulseAudio для ALSA

net-misc

ntp

Flag	Description
openntpd	Allow ntp to be installed alongside openntpd
parse-clocks	Add support for PARSE clocks
samba	Provide support for Samba's signing daemon (needed for Active Directory domain controllers)
snmp
vim-syntax
zeroconf

rsync

Flag	Description
acl
lz4
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!
xattr

net-p2p

qbittorrent

Flag	Description
systemd
webui	Install qBittorrent Web UI (qbittorrent-nox) and systemd/OpenRC service

sci-libs

dlib

Flag	Description
cblas	Build with CBLAS <pkg>virtual/cblas</pkg>
cpu_flags_x86_sse4_1
sqlite

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

sys-apps

eza

Flag	Description
git

hwloc

Flag	Description
cairo	Enable the Cairo back-end of hwloc's lstopo command
cpuid	Enable the cpuid-based architecture specific support (x86 component)
l0	Enable oneAPI Level Zero device discovery
nvml	Enable the NVML device discovery
pci	Enable PCI device discovery using libpci
rocm	Enable AMD RSMI device discovery
video_cards_nvidia

sys-cluster

minikube

Flag	Description
libvirt	Build plugin for kvm

pmix

Flag	Description
munge	Enable authentication via munge
pmi	Build PMI1 and PMI2 interface

www-apps

hugo

Flag	Description
extended	Enable SASS/SCSS and WebP encoding support

www-client

lynx

Flag	Description
brotli
cjk
gnutls	Use gnutls library for HTTPS support (openssl is the default library for HTTPS support).
idn

---