Global USE flags

Flag	Description	Packages
(		5
)		5
X		3
aac		2
alsa		4
archive	Enable archive support using app-arch/libarchive	2
cdda		2
dbus		2
debug		7
doc		6
examples		5
ffmpeg		5
flac		2
font_chars_base_one	Alternative 1	0
font_chars_dotted_zero	Dotted zero	0
font_chars_empty_dollar	Alternative dollar sign	0
font_chars_hooky	Hooky l and i chars	0
font_chars_no_contextual_alternates	Disable contextual alternates	0
font_chars_zshaped	Z-shaped l and i chars	0
font_chars_zstyle_l	Z-shaped l	0
font_types_pcf	Install fonts in X11 Portable Compiled Font format	0
font_types_pfb	Install fonts in Printer Font Binary format	0
font_variants_alt	Based on the more peculiar glyph forms of the reference fonts	0
font_variants_fantasy	Based on fonts used in fantasy games	0
font_variants_halfloose	Halfloose width	0
font_variants_halftight	Halftight width	0
font_variants_large	Large height (16px)	0
font_variants_loose	Loose width	0
font_variants_mcr	Based on retrofuturistic MCR-like 8x8 fonts	0
font_variants_slab	Slab serif typeface	0
font_variants_small	Small height (14px)	0
font_variants_smallcaps	Small caps variant	0
font_variants_tall	Double-height version	0
font_variants_thin	Based on system fonts with 1-pixel-wide lines	0
font_variants_tight	Tight width	0
font_variants_ui	An UI typeface	0
font_variants_xtralarge	Xtralarge height (17px)	0
font_variants_xtrasmall	Xtrasmall height (13px)	0
fuse	Support mounting WIMs via <pkg>sys-fs/fuse</pkg>	3
gme	Support various gaming console music formats	3
graphite	Sanitize Graphite tables	3
gtk		6
gtk3	Enable support for GTK+3	3
harfbuzz	Use Harfbuzz Repacker for packing GSUB/GPOS tables	2
interpolate	Interpolate sources	0
jack		3
jpeg		3
jpeg2k		2
l10n_zh-HK	Chinese (Hong Kong)	0
libnotify		2
libsamplerate		2
mms		2
nautilus	Install gnome-base/nautilus extension	2
nls		8
ntfs	Support direct manipulation on a NTFS volume via <pkg>sys-fs/ntfs3g</pkg>	2
openh264	Enable H.264 support using <pkg>media-libs/openh264</pkg>	2
openmpt	Add support for OpenMPT	2
opus	Enable Opus audio codec support	2
pipewire	Enable Pipewire output plugin	3
png		3
pulseaudio	Add sound server support via media-libs/libpulse (may be PulseAudio or Pipewire, or apulse if installed)	4
qt5		2
qt6		2
readline		3
sdl		3
sid	Build with SID (Commodore 64 Audio) support	2
sndfile		3
soxr	Build with SoX Resampler support	2
static		2
static-libs		5
svg		3
system-harfbuzz	Use the system-wide <pkg>media-libs/harfbuzz</pkg>	2
test		43
threads		3
tiff		3
truetype		2
unicode		2
vorbis		2
wavpack		2
wayland		3

Category USE flags

media-fonts

Flag	Description	Packages
autohint	Auto-hint fonts with ttfautohint	7
binary	Use official upstream pre-built binaries	35
cjk		2
emoji	Install emoji fonts	2
fixed		2
font_types_otf	Install fonts in OpenType format	37
font_types_ttc	Install fonts in TrueType font collection format	3
font_types_ttf	Install fonts in TrueType format	2
font_variants_fixed	Exact monospace font without ligatures and wide glyphs	2
font_variants_monospace	A monospaced typeface	3
font_variants_sans	Sans-serif typeface	2
font_variants_serif	Serif typeface	2
font_variants_term	A narrower variant focusing terminal uses	2
ja		4
ko		4
latex		5
otf		5
slab		2
super-otc	Install single combined Super OTC collection	3
term		2
ttc		7
ttf		2
variable	Build variable fonts	13
zh-CN		4
zh-HK		4
zh-TW		4

media-gfx

Flag	Description	Packages
gif		2

media-libs

Flag	Description	Packages
gui	Build heif-view (requires USE=tools)	2

media-sound

Flag	Description	Packages
sanitize	Enable AddressSanitizer	2

net-misc

Flag	Description	Packages
mediainfo	Use <pkg>media-libs/libmediainfo</pkg> for media files	2

Local USE flags

app-arch

7-zip

Flag	Description
asm	Enable assembly for optimization
rar	Enable support for non-free rar decoder

wimlib

Flag	Description
yasm	Prefer <pkg>dev-lang/yasm</pkg> over <pkg>dev-lang/nasm</pkg>

app-text

fntsample

Flag	Description
perl

rst2pdf

Flag	Description
aafigure	ASCII art figure rendering via <pkg>dev-python/aafigure</pkg>
html	Rendering of raw HTML via <pkg>dev-python/xhtml2pdf</pkg>
matplotlib	Add support for <pkg>dev-python/matplotlib</pkg>
plantuml	Add support for <pkg>media-gfx/plantuml</pkg>

dev-cpp

xsd

Flag	Description
zlib

dev-libs

libdigidocpp

Flag	Description
apidocs	Build API documentation

libraqm

Flag	Description
gtk-doc

xml-security-c

Flag	Description
nss	Use <pkg>dev-libs/nss</pkg> for certain crypto operations (configureable at runtime)

dev-python

compreffor

Flag	Description
cython	Generate cpp sources with <pkg>dev-python/cython</pkg>

fonttools

Flag	Description
interpolatable	Enable support for finding wrong contour/component order between different masters
plot	Enable support for visualizing DesignSpaceDocument and resulting VariationModel
reportlab	Enable support for drawing glyphs as PNG images
skia	Use skia-pathops to remove overlaps in TTF fonts
ufo	Enable support for reading and writing UFO source files
woff	Enable compression support for WOFF 1.0/2.0 webfonts

pyHanko

Flag	Description
opentype	Support for embedding ttf/otf fonts
pillow	Support for embedding images
pkcs11	PKCS#11 integration via <pkg>dev-python/python-pkcs11</pkg>

ufoLib2

Flag	Description
msgpack	Enable msgpack support
orjson	Use orjson in place of built-in json library

dev-util

fontmake

Flag	Description
json	Enable support for ufoLib2's .ufo.json files

media-fonts

adobe-source

Flag	Description
l10n_ja

iosevka-src

Flag	Description
aile
curly
custom
default
etoile
font_variants_aile	A quasi-proportional variant
font_variants_curly	A variant with curly leg shapes
font_variants_custom	User customized variant
font_variants_default	The default variant with ligatures and semantic full-width glyphs
font_variants_etoile	A quasi-proportional slab-serif variant
font_variants_ss01	A variant stylized after Andale Mono
font_variants_ss02	A variant stylized after Anonymous Pro
font_variants_ss03	A variant stylized after Consolas
font_variants_ss04	A variant stylized after Menlo
font_variants_ss05	A variant stylized after Fira Mono
font_variants_ss06	A variant stylized after Liberation Mono
font_variants_ss07	A variant stylized after Monaco
font_variants_ss08	A variant stylized after Pragmata Pro
font_variants_ss09	A variant stylized after Source Code Pro
font_variants_ss10	A variant stylized after Envy Code R
font_variants_ss11	A variant stylized after X Windows Fixed
font_variants_ss12	A variant stylized after Ubuntu Mono
font_variants_ss13	A variant stylized after Lucida
font_variants_ss14	A variant stylized after JetBrains Mono
font_variants_ss15	A variant stylized after IBM Plex Mono
font_variants_ss16	A variant stylized after PT Mono
font_variants_ss17	A variant stylized after Recursive Mono
font_variants_ss18	A variant stylized after Input Mono
savedconfig
ss01
ss02
ss03
ss04
ss05
ss06
ss07
ss08
ss09
ss10
ss11
ss12
ss13
ss14
ss15
ss16
ss17
ss18

noto-emoji

Flag	Description
cbdt
colrv1
font_variants_cbdt	Install Color Bitmap Data Table fonts (raster graphics)
font_variants_colrv1	Install COLRv1 fonts (vector graphics)

noto-source

Flag	Description
clean-as-you-go	Clean intermediate ufos after they were built (useful when PORTAGE_TMPDIR resides on a tmpfs)

sarasa-gothic

Flag	Description
${IUSE_L10N[@]/l10n_/l10n_}
classical	Classical orthography
monospace
sans
ui

source-han-sans

Flag	Description
half-width	Install fonts that use half-width glyphs for ASCII by default

unscii

Flag	Description
utils	Install bm2uns util to convert a bitmap image to unscii art

media-gfx

fim

Flag	Description
aalib
dia	Enable DIA file support via app-office/dia
djvu
exif
fbcon
graphicsmagick	Enable GraphicsMagick library support
imagemagick
imlib
pdf
postscript
screen	Add experimental support for running under screen
xfig	Enable FIG file support via media-gfx/xfig

fontforge

Flag	Description
extras	Build and install programs from the contrib directory
libspiro	Add support for media-libs/libspiro
python
truetype-debugger	Enable truetype debugger in fontforge
woff2	Enable WOFF2 support

media-libs

harfbuzz

Flag	Description
cairo
experimental	Enable experimental APIs
glib	Enable <pkg>dev-libs/glib</pkg> unicode functions
icu
introspection

libheif

Flag	Description
aom	Use <pkg>media-libs/libaom</pkg> for AVIF encoding/decoding
brotli
dav1d	Enable support for the dav1d codec decoding using <pkg>media-libs/dav1d</pkg>
de265	Enable H.265 support using <pkg>media-libs/libde265</pkg>
gdk-pixbuf	Enable <pkg>x11-libs/gdk-pixbuf</pkg> plugin
kvazaar	Enable H.265/HEVC encoding support via <pkg>media-libs/kvazaar</pkg>
openjph	Enable support for HT-J2K via <pkg>media-libs/openjph</pkg>
rav1e	Use <pkg>media-video/rav1e</pkg> for AVIF encoding
svt-av1	Use <pkg>media-libs/svt-av1</pkg> for SVT-AV1 encoding
test-full	Allow tests that rely on options not normally enabled
tools	Build command line tools
uvg266	Enable support for VVC via <pkg>media-libs/uvg266</pkg>
vvdec	Enable support for VVC via <pkg>media-libs/vvdec</pkg>
vvenc	Enable support for VVC via <pkg>media-libs/vvenc</pkg>
webp	Enable high-quality YCbCr/RGB color space conversion algorithms
x264
x265	Use <pkg> media-libs/x265</pkg> for HEIF encoding

openjph

Flag	Description
arm_neon
simd	Enable the use of SIMD instructions
x86_{avx,avx2,avx512f,sse,sse2,ssse3,sse4_2}

media-plugins

audacious-plugins

Flag	Description
ampache	Support controlling audacious via ampache
bs2b	Enable Bauer Bauer stereophonic-to-binaural headphone filter
cue	Support CUE sheets using the libcue library
fluidsynth	Support FluidSynth as MIDI synth backend
http	Support HTTP streams through neon
lame
lirc
modplug
mp3
mpris	Enable support for MPRIS2 interface
opengl
qtmedia	Enable playback via <pkg>dev-qt/qtmultimedia</pkg>
scrobbler	Build with scrobbler/LastFM submission support
streamtuner	Build the streamtuner plugin

media-sound

ardour

Flag	Description
bindist
bundled-libs	Use bundled libs instead of system installed
cpu_flags_x86_avx
cpu_flags_x86_avx512f
cpu_flags_x86_sse
hid	Add support for <pkg>dev-libs/hidapi</pkg>
phone-home	Contact ardour.org at startup for new announcements
vst	Enable VST plugin support
websockets	Enable support for WebSocket protocol

audacious

Flag	Description
libarchive	Enable libarchive support

deadbeef

Flag	Description
adplug	Enable adplug plugin
alac	Add support for Apple Lossless Audio Codec files
artwork	Enable albumart plugin
curl
dts
dumb	Enable media-libs/dumb module library support
lastfm	Enable last.fm support
libretro	Enable Libretro resampler plugin
mac	Add support for decoding Monkey's Audio files
mad
midi	Enables MIDI support
musepack
oss
psf	Enable AOSDK-based PSF plugin
sc68	Enable Atari ST and Amiga music player
shorten	Enable the shorten decoder plugin
tta	Add support for decoding True Audio input files
wma	Add support for decoding Windows Media Audio files
zip	Build vfs_zip plugin

flactag

Flag	Description
gcrypt	Use libgcrypt for low-level crypto
scripts	Install additional scripts to /usr/bin

fooyin

Flag	Description
loudness	Support loudness normalisation according to the EBU R128 standard using <pkg>media-libs/libebur128</pkg>
pch
soundtouch	Enable SoundTouch DSP plugin

picard

Flag	Description
discid	Enable reading the ID of the inserted CD
fingerprints	Enable calculation and lookup of AcoustID fingerprints

rsgain

Flag	Description
std_format	Use std::format instead of <pkg>dev-libs/libfmt</pkg> (reqires gcc >= 14 or libcxx >= 18)

net-misc

megacmd

Flag	Description
pcre

meganz-sdk

Flag	Description
freeimage	Enable support for image I/O via <pkg>media-libs/freeimage</pkg>
inotify
libuv	Support asynchronous I/O via <pkg>dev-libs/libuv</pkg>
raw
sqlite

megasync

Flag	Description
breakpad	Use <pkg>dev-util/breakpad</pkg> as the crash handler
dolphin	Install <pkg>kde-apps/dolphin</pkg> extension
nemo	MEGA Desktop App plugin for <pkg>gnome-extra/nemo</pkg>
thunar	MEGA Desktop App plugin for <pkg>xfce-base/thunar</pkg>

sys-block

partclone

Flag	Description
apfs	Include APFS support
btrfs	Include BTRFS support
e2fs	Include EXT2/3/4 support
exfat	Include exfat support
f2fs	Include F2FS support
fat	Include FAT16/FAT32 support
hfs	Include HFS support
minix	Include MINIX FS support
ncurses
nilfs2	Include NILFS2 support
reiserfs	Include ReiserFS support
xfs	Include XFS support

www-client

torbrowser

Flag	Description
clang	Use Clang compiler instead of GCC
eme-free	Disable EME (DRM plugin) capability at build time
hardened
hwaccel	Force-enable hardware-accelerated rendering (Mozilla bug 594876)
jpegxl
jumbo-build	Enable unified build - combines source files to speed up build process, but requires more memory
libproxy	Enable libproxy support
pgo	Add support for profile-guided optimization for faster binaries - this option will double the compile time
selinux
sndio	Enable support for the <pkg>media-sound/sndio</pkg> backend
system-av1	Use the system-wide <pkg>media-libs/dav1d</pkg> and <pkg>media-libs/libaom</pkg> library instead of bundled
system-icu	Use the system-wide <pkg>dev-libs/icu</pkg> instead of bundled
system-jpeg	Use the system-wide <pkg>media-libs/libjpeg-turbo</pkg> instead of bundled
system-libevent	Use the system-wide <pkg>dev-libs/libevent</pkg> instead of bundled
system-libvpx	Use the system-wide <pkg>media-libs/libvpx</pkg> instead of bundled
system-pipewire	Use system <pkg>media-video/pipewire</pkg> for WebRTC and screencast instead of bundled one
system-png	Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches)
system-webp	Use the system-wide <pkg>media-libs/libwebp</pkg> instead of bundled
valgrind
vanilla
wasm-sandbox	Sandbox certain third-party libraries through WebAssembly using RLBox
wifi

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