Global USE flags

Flag	Description	Packages
X		3
alsa		2
bzip2	Add extra support for bzip2	2
curl	Use the <pkg>net-misc/curl</pkg> for supporting IMAP, MPD and weather widgets	2
cxx		2
dbus	Build bindings for the QtDBus module	2
dconf	Enable support for <pkg>gnome-base/dconf</pkg>	2
debug		7
doc	Add an example documentation	54
examples	Build examples in documentation which needs online data.	31
fcitx5	Enable support for <pkg>app-i18n/fcitx5</pkg>	2
gles2-only		3
gnutls		2
gtk	Enable support for GTK 3 or 4 backend	2
gui	Install graphical user interface tool (mozc_tool)	2
hdf5	Extra hdf5 support via <pkg>dev-python/h5py</pkg>	2
http	asdf.open with urls (like those for s3 resources) provided using <pkg>dev-python/fsspec</pkg>.	2
ibus	Enable support for <pkg>app-i18n/ibus</pkg>	7
introspection		3
lz4	Including optional support for lz4 compression provided by <pkg>dev-python/lz4</pkg>.	2
minimal	Build libraries &amp; userspace tools only. Does not install any server code	2
multimedia	Build bindings for the QtMultimedia module	2
nsplugin	Install the Netscape Flash API plugin (for Firefox and similar browsers)	2
opengl	Build bindings for the QtOpenGL module	2
openmp		3
png		2
policykit		2
printsupport	Build bindings for the QtPrintSupport module	2
pulseaudio		3
python		2
qt5	Enable support for Qt5 backend via <pkg>dev-python/pyqt5</pkg>	3
qt6		3
remote	support for reading/writing to remote data stores via <pkg>dev-python/fsspec</pkg>	2
selinux		2
ssl		2
static-libs		6
svg	Build bindings for the QtSvg module	2
systemd		2
test		23
xkb	Enable support for XKB (required for fcitx-xkb, fcitx-xkbdbus, part of fcitx-keyboard)	2
zstd	Add extra support for zstd	2

Category USE flags

dev-python

Flag	Description	Packages
all	<pkg>dev-python/imageio</pkg> for more function support	15
bokeh	bokeh plotting support	2
cli	Extra cli support	2
code_style	Extra code_style support for development	3
colors	Add extra colors support	2
ext4	Add extra support for ext4	2
fsspec	Add extra support for fsspec	3
full	Include most extra dependencies	3
git	Add extra support for git	2
h5netcdf	h5netcdf I/O support	2
intersphinx	Enable intersphinx while doc building.	32
ipython	Extra ipython support	2
lzo	Add extra support for lzo	2
matplotlib	matplotlib plotting support	2
netcdf4	netcdf4 I/O support	2
numba	Extra numba support	2
pdf	Add extra support for pdf	2
plot	Support for quick_plot for Skymap via <pkg>dev-python/matplotlib</pkg>.	2
plotly	plotly plotting support	2
plotting	Extra plotting support	2
pyside6	Enable support for PySide backend via <pkg>dev-python/pyside</pkg>	2
qt	Include PyQt5 library	4
recommended	Recommended optional features	3
rtd	Extra rtd support	4
s3	s3 support via <pkg>dev-python/boto3</pkg>	2
sphinx	Extra sphinx support	2
sqlar	Add extra support for sqlar	2
squashfs	Add extra support for squashfs	2
wcs	make line or image plots for a numpy array and associated WCS object from <pkg>dev-python/astropy</pkg>.	2
zarr	zarr I/O support	2

dev-qt

Flag	Description	Packages
qml	Build QML bindings	3

net-misc

Flag	Description	Packages
keep-server	Keep sunloginclient server running after quit the GUI client.	2

sys-libs

Flag	Description	Packages
split-usr		2

Local USE flags

app-editors

formiko

Flag	Description
vim	Vim editor support (formiko-vim command) via <pkg>app-editors/gvim</pkg>

app-i18n

fcitx

Flag	Description
autostart	Enable XDG-compatible autostart of Fcitx
cairo
enchant	Enable Enchant backend (using <pkg>app-text/enchant</pkg>) for spelling hinting
gtk2	Install input method module for GTK+ 2
gtk3	Install input method module for GTK+ 3
lua
nls
opencc	Enable OpenCC engine (using <pkg>app-i18n/opencc</pkg>) for converter between Simplified Chinese and Traditional Chinese
pango	Enable support for <pkg>x11-libs/pango</pkg>
table	Install table input methods for Simplified Chinese

mozc

Flag	Description
emacs
fcitx4	Enable support for <pkg>app-i18n/fcitx</pkg> 4
renderer	Enable native candidate window

app-office

wps-office

Flag	Description
${IUSE}
cn	Use CN version of WPS Office (including WPS Cloud, WPS account login and other functions)
l10n_
l10n_${X}
l10n_zh-HK	Chinese (Traditional, Hong Kong S.A.R.)
l10n_zh-MO	Chinese (Traditional, Macao S.A.R.)
libsystemd	Use bundled libdbus that depends on <pkg>virtual/libsystemd</pkg>
mime	Use mime files provided by WPS
system-freetype	Use <pkg>media-libs/freetype</pkg> instead of <pkg>media-libs/freetype-wps</pkg>.

app-pda

i4tools

Flag	Description
fcitx	Enable support for <pkg>app-i18n/fcitx</pkg> 4

app-text

goldendict

Flag	Description
ffmpeg
webengine	Use <pkg>dev-qt/qtwebengine</pkg> instead of <pkg>dev-qt/qtwebkit</pkg>

ydcv

Flag	Description
pkg-info	Add descriptions to PKG-INFO file

ydcv-rs

Flag	Description
clipboard	Enable feature: use selected text as input
notify	Enable feature: display explanations via desktop notification
rustls	Enable feature: use Rustls ssl backend

dev-lang

gdl

Flag	Description
eigen	Build matrix manipulation with <pkg>dev-cpp/eigen</pkg>
fftw
glpk	Use GNU Linear Programming Kit <pkg>sci-mathematics/glpk</pkg>
graphicsmagick
gshhs	Add support for projection adn continent maps with <pkg>sci-geosciences/gshhs-data</pkg>
hdf	Add support for the Hierarchical Data Format v.4
imagemagick
netcdf
postscript
proj	Add support for <pkg>sci-libs/proj</pkg> (geographic projections)
shapelib	Add support for manipulating ESRI Shapefiles with <pkg>sci-libs/shapelib</pkg>
tiff
udunits	Add support for manipulating units of physical quantities
wxwidgets

dev-python

ablog

Flag	Description
markdown	Extra markdown support via <pkg>dev-python/myst-parser</pkg>
notebook	Extra notebook support

aiobotocore

Flag	Description
httpx	Extra require via <pkg>dev-python/httpx</pkg>

aioftp

Flag	Description
socks	Client socks proxy via <pkg>dev-python/siosocks</pkg>

arviz-stats

Flag	Description
xarray	xarray support for more featrue

azure-core

Flag	Description
aio	Extra aio support via <pkg>dev-python/aiohttp</pkg>
tracing	Extra tracing support via <pkg>dev-python/opentelemetry-api</pkg>

corner

Flag	Description
arviz	Support for plotting ArviZ samples

dask-image

Flag	Description
dataframe	Optional datafram support

echo

Flag	Description
vue	Vue/ipywidgets supoort via <pkg>dev-python/traitlets</pkg>

f90nml

Flag	Description
yaml	Extra yaml support

ginga

Flag	Description
tk	Enable support for Tk backend via <pkg>dev-python/aggdraw</pkg>
web	Enable support for web backend via <pkg>dev-python/tornado</pkg>

glue-core

Flag	Description
astronomy	More astronomy support

glue-vispy-viewers

Flag	Description
pyqt	Extra pyqt support
pyside	Extra pyside support

h5netcdf

Flag	Description
h5py	h5py backend support via <pkg>dev-python/h5py</pkg>
h5pyd	h5pyd backend support via <pkg>dev-python/h5py</pkg>
pyfive	pyfive backend support via <pkg>dev-python/pyside</pkg>

h5pyd

Flag	Description
aws	Extra aws support via <pkg>dev-python/s3fs</pkg>
azure	Extra azure support
google	Extra google support

mocpy

Flag	Description
astropy_regions	MOC.from_astropy_regions support via <pkg>dev-python/regions</pkg>.
plots	plots, used in fill and border or get_boundaries.
query_fits	query FITS files by url via<pkg>dev-python/requests</pkg>.

msrest

Flag	Description
async	Extra async support

ndcube

Flag	Description
reproject	Extra reproject support via <pkg>dev-python/reproject</pkg>

numcodecs

Flag	Description
crc32c	Extra CRC32 check support via <pkg>dev-python/crc32c</pkg>
google_crc32c	Extra Google version of CRC32 check support via <pkg>dev-python/google-crc32c</pkg>
msgpack	Extra MsgPack support via <pkg>dev-python/msgpack</pkg>
zfpy	Extra ZFPY support via <pkg>dev-python/zfp</pkg>

parfive

Flag	Description
ftp

partd

Flag	Description
complete	Include more dependencies for complete function

photutils

Flag	Description
local-datasets	Add local data for photutils.datasets

poetry-dynamic-versioning

Flag	Description
plugin	plugin support via <pkg>dev-python/poetry</pkg>

properdocs

Flag	Description
i18n	Internationalization support via <pkg>dev-python/babel</pkg>

pyqt5

Flag	Description
declarative	Build bindings for the QtQml and QtQuick modules and enable the qmlscene plugin
designer	Build bindings for the QtDesigner module and enable the designer plugin
help	Build bindings for the QtHelp module
location	Build bindings for the QtLocation module
network	Build bindings for the QtNetwork module
positioning	Build bindings for the QtPositioning module
sensors	Build bindings for the QtSensors module
serialport	Build bindings for the QtSerialPort module
speech	Build bindings for the QtTextToSpeech module
sql	Build bindings for the QtSql module
testlib	Build bindings for the QtTest module
webchannel	Build bindings for the QtWebChannel module
webkit	Build bindings for the QtWebKit module
websockets	Build bindings for the QtWebSockets module
widgets	Build bindings for the QtWidgets module
x11extras	Build bindings for the QtX11Extras module
xmlpatterns	Build bindings for the QtXmlPatterns module

pytest-benchmark

Flag	Description
aspect	Experimental benchmark_weave fixture that can patch stuff using <pkg>dev-python/aspectlib</pkg>.
elasticsearch	Elasticesearch support via<pkg>dev-python/elasticsearch</pkg>.
histogram	Histogram plotting support

pytest-run-parallel

Flag	Description
psutil	Identifying the number of logical cores available to the testing process via <pkg>dev-python/psutil</pkg>

python-socketio

Flag	Description
asyncio-client	Use asyncio client
client	Use standard Python client

pytkdocs

Flag	Description
numpy-style	Numpy style support via <pkg>dev-python/docstring-parser</pkg>.

ratarmountcore

Flag	Description
7z	Add extra support for 7z
fat	Add extra support for fat via <pkg>dev-python/pyfatfs</pkg>
fsspec-backends	Add extra support for more fsspec backends
full-ssh	Include most ssh functions with <pkg>dev-python/sshfs</pkg>
gzip	Add extra support for gzip
rar	Add extra support for rar
xz	Add extra support for xz
zip	Add extra support for zip

siosocks

Flag	Description
trio	Extra trio support

spectral-cube

Flag	Description
noviz	More dependency for non-visualization support
viz	More dependency for visualization support
viz_extra	Even more extra dependency for visualization support

sphinx

Flag	Description
latex

sphinx-astropy

Flag	Description
confv2	To use the new pydata-sphinx-theme with sphinx_astropy.conf.v2

sphinx-design

Flag	Description
code-style	Extra code_style support for development via <pkg>dev-vcs/pre-commit</pkg>
theme-furo	Furo theme support via <pkg>dev-python/furo</pkg>
theme-pydata	PyData theme support via <pkg>dev-python/pydata-sphinx-theme</pkg>
theme-rtd	RTD theme support via <pkg>dev-python/sphinx-rtd-theme</pkg>
theme-sbt	Book theme support via <pkg>dev-python/sphinx-book-theme</pkg>

sphinxcontrib-youtube

Flag	Description
doc-demo	Include online demo video in documentation

sphinxext-opengraph

Flag	Description
social_cards	To generate social cards via <pkg>dev-python/matplotlib</pkg>

stanio

Flag	Description
ujson	Faster serialization via <pkg>dev-python/ujson</pkg>

sunpy

Flag	Description
asdf	Extra asdf support via <pkg>dev-python/asdf-astropy</pkg>
dask	Extra dask support via <pkg>dev-python/dask</pkg>
database	Extra database support via <pkg>dev-python/sqlalchemy</pkg>
image	Extra image support
jpeg2k	Extra JPEG 2000 support via <pkg>dev-python/glymur</pkg>
map	Extra map support
net	Extra net support
opencv	Extra opencv support via <pkg>media-libs/opencv</pkg>
skimage	Include optional scikit-image support via <pkg>dev-python/scikit-image</pkg>
timeseries	Extra timeseries support
visualization	Extra visualization support

vispy

Flag	Description
$(python_gen_useflags
glfw	Enable support for pyglet backend via <pkg>dev-python/glfw</pkg>
io	Extra io support
ipython-static	ipython-static support via <pkg>dev-python/ipython</pkg>
pyglet	Enable support for pyglet backend via <pkg>dev-python/pyglet</pkg>
pyqt5	Enable support for pyqt5 backend via <pkg>dev-python/pyqt5</pkg>
pyqt6	Enable support for pyqt6 backend via <pkg>dev-python/pyqt6</pkg>
pyside2	Enable support for pyside2 backend via <pkg>dev-python/pyside2</pkg>
python3_{10,11})
sdl2	Enable support for sdl backend via <pkg>dev-python/pysdl2</pkg>
wx	Enable support for wx backend via <pkg>dev-python/wxpython</pkg>

webdav4

Flag	Description
http2	http2 support

xarray-einstats

Flag	Description
einops	Add optional dependency <pkg>dev-python/einops</pkg>

zarr

Flag	Description
jupyter	Extra jupyter support
optional	Additional optional dependencies <pkg>dev-python/universal-pathlib</pkg>

dev-qt

qtwebkit

Flag	Description
geolocation	Enable physical position determination via <pkg>dev-qt/qtpositioning</pkg>
gstreamer	Enable HTML5 audio/video support via <pkg>media-libs/gstreamer</pkg> using SLOT 1.0
hyphen	Enable hyphenation support via <pkg>dev-libs/hyphen</pkg>
jit
orientation	Enable device orientation detection via <pkg>dev-qt/qtsensors</pkg>
webp

gnome-base

gconf

Flag	Description
ldap	Build backend which enables default mail accounts, addressbooks and calendars for Evolution to be configured using each user's LDAP entry."

gui-apps

regreet

Flag	Description
cage	Use cage to start regreet
gtk4	Compile with support for gtk4
logs	Compile logs support regreet (debug)
sway	Use sway to start regreet

kde-plasma

ksysguard

Flag	Description
lm-sensors

media-libs

freetype-wps

Flag	Description
adobe-cff	Use Adobe CFF as default font-renderer
brotli
cleartype-hinting	Bytecode hinting mode for TrueType fonts that activates subpixel hinting (a.k.a. ClearType hinting) by default
fontforge	Install internal headers required for TrueType debugger in <pkg>media-gfx/fontforge</pkg> (built with USE=truetype-debugger)
harfbuzz	Use <pkg>media-libs/harfbuzz</pkg> for auto-hinting OpenType fonts. WARNING: may trigger circular dependencies!
infinality	Enable infinality options for improved LCD filtering
utils	Install utilities and examples from ft2demos

media-video

gnome-mplayer

Flag	Description
gda	Enable support for <pkg>gnome-extra/libgda</pkg>
gnome
ipod
libnotify

net-im

wemeet

Flag	Description
bundled-libs	Use the upstream provided bundled libraries.
bundled-qt	Use bundled Qt and icu instead of system-wide libs.
pipewire	Use native <pkg>media-video/pipewire</pkg> audio backend
wayland

net-libs

libaxon-bin

Flag	Description
purple	libpurple protocol support via <pkg>x11-plugins/purple-oicq</pkg>

net-misc

todesk

Flag	Description
fonts	Install the bundled Noto fonts for CJK users (Not needed if <pkg>media-fonts/noto-cjk</pkg> is already installed)

net-nds

openldap-compat

Flag	Description
${IUSE_CONTRIB}
berkdb
c
crypt
experimental	Enable experimental backend options
iodbc
ipv6
kinit	Enable support for kerberos init
odbc	Enable ODBC and SQL backend options
overlays	Enable contributed OpenLDAP overlays
pbkdf2	Enable support for pbkdf2 passwords
perl
samba
sasl
sha2	Enable support for pw-sha2 password hashes
smbkrb5passwd	Enable overlay for syncing ldap, unix and lanman passwords
syslog
tcpd

net-proxy

v2raya-bin

Flag	Description
v2ray	To be able to use v2ray-core. Default for old version. From 2.0.4 you need to disable xray flag to use v2ray as default
xray	To use xray-core as default from 2.0.4

sci-astronomy

astrometry

Flag	Description
netpbm	Compile and link netpbm

healpix

Flag	Description
idl	Install healpix IDL/GDL routines
java

topcat

Flag	Description
extra	Install the bloated version including Parquet file format support
standard	Install the stardard version

wcslib

Flag	Description
fits	Enable support for the FITS format through <pkg>sci-libs/cfitsio</pkg>
fortran
pgplot	Builds PGBSOX routines, needs <pkg>sci-libs/pgplot</pkg> library
tools	Builds and installs extra command line utilities for WCS checking

sys-libs

libsystemd

Flag	Description
acl
apparmor
audit	Enable support for <pkg>sys-process/audit</pkg>
boot	Enable EFI boot manager and stub loader
cgroup-hybrid	Default to hybrid (legacy) cgroup hierarchy instead of unified (modern).
cryptsetup	Enable cryptsetup tools (includes unit generator for crypttab)
dns-over-tls	Enable DNS-over-TLS support
elfutils	Enable coredump stacktraces in the journal
fido2	Enable FIDO2 support
gcrypt	Enable use of <pkg>dev-libs/libgcrypt</pkg> for various features
homed	Enable portable home directories
idn
imds	Enable IMDS (Instance Metadata Service)
importd	Enable import daemon
kernel-install	Enable kernel-install
kmod	Enable kernel module loading via <pkg>sys-apps/kmod</pkg>
libarchive	Enable libarchive support
lzma
openssl	Enable use of <pkg>dev-libs/openssl</pkg> for various features
pam
passwdqc	Use <pkg>sys-auth/passwdqc</pkg> for password checking in homed
pcre
pkcs11	Enable PKCS#11 support for cryptsetup and homed
pwquality	Use <pkg>dev-libs/libpwquality</pkg> for password checking in homed
qrcode	Enable qrcode output support in journal
resolvconf	Install resolvconf symlink for systemd-resolve
seccomp
sysv-utils	Install sysvinit compatibility symlinks and manpages for init, telinit, halt, poweroff, reboot, runlevel, and shutdown
tpm	Enable TPM support
ukify	Enable systemd-ukify
vanilla	Disable Gentoo-specific behavior and compatibility quirks

www-plugins

adobe-flash

Flag	Description
ppapi	Install the Pepper Flash API plugin (for Chrome and similar browsers)

freshplayerplugin

Flag	Description
jack
libressl
v4l	Use libv4l2 for colorspace conversion
vaapi
vdpau

x11-libs

lain

Flag	Description
luajit

x11-plugins

purple-oicq

Flag	Description
libaxon	Nodejs backend via <pkg>net-libs/libaxon-bin</pkg>

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