Global USE flags

Flag	Description	Packages
X	Enable audible bell for X11	16
abi_x86_32		15
abi_x86_64		14
alsa		3
aqua		3
broadway	Enable the GDK Broadway backend.	2
bzip2		2
cloudproviders		2
colord	Use <pkg>x11-misc/colord</pkg> for color management in printing	2
cpu_flags_arm_neon		3
cpu_flags_x86_mmx		3
cpu_flags_x86_sse		3
cpu_flags_x86_sse2		3
cups		2
dbus		6
debug		18
directfb		8
doc		13
egl	build with EGL support	4
emacs		3
examples		4
fbdev		3
ffmpeg		4
freetype		2
gles2	build gles2 gfxdriver	4
glib	Compile with GLib Object System support	2
glx		3
gstreamer		6
gtk-doc		4
gtk2		4
gtk3		4
gui		4
introspection		5
ipv6		2
jemalloc		2
jpeg		3
minimal		7
modules		2
ncurses		2
nls		6
opengl		5
pam		4
pch		2
png		6
print		3
pulseaudio		2
python		2
qt6		2
readline		2
sdk	Enable building of SDK.	2
sdl		4
selinux		8
ssl	Enable raop-sink support (needs <pkg>dev-libs/openssl</pkg>)	4
static		2
static-libs	Install the XNVCtrl static library for accessing sensors and other features	7
svg		2
sysprof	Enable profiling data capture support using <pkg>dev-util/sysprof-capture</pkg>	4
systemd		5
systemtap		2
test		22
tests		2
tiff		4
tools	Install extra tools (including gpgsplit and gpg-zip).	3
truetype	Build and install grub-mkfont conversion utility	4
udev	Controls installation of special USB udev rules.	5
unicode		2
unwind		4
utils		2
v4l		3
valgrind		4
vdpau		2
video_cards_intel		2
video_cards_nouveau		2
video_cards_r600		2
video_cards_radeonsi		2
video_cards_vmware		2
vulkan		2
wayland		10
xcb		3
xinerama		2
zlib		2

Category USE flags

dev-libs

Flag	Description	Packages
bmp	build BMP image provider	3
divine	enable DiVine	2
drmkms	build with DRM/KMS support	3
dynload	enable dynload support	2
fusiondale	enable FusionDale	2
fusionsound	enable FusionSound	3
gif		2
imlib2	build Imlib2 image provider	3
input_hub	provides an asynchronous interface to the input devices available and those being added/removed	2
mad		2
mng		2
mpeg2	build MPEG2 image provider	2
mpeg3	build Libmpeg3 video provider	2
multicore	enable multicore support	2
oss		2
playlist		2
pnm	build PNM (PBM/PGM/PPM) image provider	2
sawman	enable SaWMan (window manager and application manager)	2
swfdec	build Swfdec (Flash decoder) video provider	3
tremor	build Ogg/Vorbis music provider using Tremor	3
vorbis		2
webp	build WebP image provider	3

x11-base

Flag	Description	Packages
dbe		2
dpms		2
elogind		3
screensaver		2
suid		4
xcsecurity		3
xdm-auth-1		2
xdmcp		2
xephyr		3
xf86bigfont		2
xfbdev		2
xnest		2
xorg		2
xres		2
xvfb		3

Local USE flags

app-crypt

gnupg

Flag	Description
alternatives
gnutls
gpgsm
ldap
ntbtls
smartcard	Build scdaemon software. Enables usage of OpenPGP cards. For other type of smartcards, try <pkg>app-crypt/gnupg-pkcs11-scd</pkg>. Bring in <pkg>dev-libs/libusb</pkg> as a dependency; enable scdaemon.
tofu	Enable support for Trust on First use trust model; requires <pkg>dev-db/sqlite</pkg>.
tpm	Enable TPM support via <pkg>app-crypt/tpm2-tss</pkg> and build tpm2d.
usb	Build direct CCID access for scdaemon; requires <pkg>dev-libs/libusb</pkg>.
user-socket	try a socket directory which is not removed by init manager at session end
wks-server	Install the wks-server

app-editors

l3afpad

Flag	Description
search-history
statistics
xinput2

app-emulation

faudio

Flag	Description
dumpvoices	FAudio dumps buffer data to individual files with RIFF/XWMA headers, usable with players like ffplay/testxwma.

virtualbox

Flag	Description
dtrace	Install dtrace Extension Pack.
java
lvm	Build VBoxVolInfo that needs devicemapper from <pkg>sys-fs/lvm2</pkg>.
vboxwebsrv	Build and install the VirtualBox webservice.
vde	Support for VDE networking via <pkg>net-misc/vde</pkg>.
vmmraw	Enable 32-bit support on a 64-bit kernel.
vnc

app-misc

projektor

Flag	Description
mupdf
poppler

various-shims

Flag	Description
gettext
intltool
itstool
polkit
vala
xmlto

yagears

Flag	Description
drm
efl
fltk
gl
glfw
glut
qt4
qt5
rpi
sdl1
sdl2
sfml
vk-d2d
waffle
wx

dev-build

cmake

Flag	Description
dap

dev-lang

ruby

Flag	Description
berkdb
gdbm
jit
socks5
tk
xemacs

dev-libs

DirectFB

Flag	Description
${IUSE_INPUT_DEVICES//
${IUSE_VIDEO_CARDS//
cddb
fbcon
jpeg2k
timidity
wawe
xine

DirectFB2

Flag	Description
linux_input
memcpy-probing
multi-application
multi-kernel
network
piped-stream
sentinels
smooth-scaling
text
trace

directfb-media

Flag	Description
avif
gdkpixbuf
heif
jasper
jxl
libmpeg3
lodepng
nanosvg
openexr
plm
sft
spng
stb
yuv

fusionsound

Flag	Description
filter
ieee-floats
multichannel

glib

Flag	Description
elf
mime
xattr

libclc

Flag	Description
spirv
video_cards_nvidia

libcrypto-compat

Flag	Description
patchelf

libkms

Flag	Description
video_cards_exynos
video_cards_radeon

swiftshadergl-directfb

Flag	Description
named-mmap
pool-alloc

tinyglut

Flag	Description
dfbgl
dummy
glfbdev
x11

dev-qt

linguist-tools

Flag	Description
qml	Enable QML support in lupdate

qtcore

Flag	Description
icu
old-kernel	Disable syscalls not available on Linux kernels older than 4.11

qtnetwork

Flag	Description
gssapi	Enable support for GSSAPI (<pkg>virtual/krb5</pkg>)
libproxy	Use <pkg>net-libs/libproxy</pkg> for automatic HTTP/SOCKS proxy configuration
sctp

qtsql

Flag	Description
freetds
mysql
oci8
odbc
postgres
sqlite

dev-util

codeblocks

Flag	Description
contrib	Build additional contrib components
fortran	Build FortranProject plugin which enables to use Code::Blocks IDE for Fortran language

games-util

steam-launcher

Flag	Description
desktop-portal	Enable desktop integration, e.g. for file pickers
dialogs	Support additional dialogs before the client starts
joystick
steamruntime	Use the official Steam runtime libraries
steamvr	Enable SteamVR virtual reality support
trayicon	Enable system tray icon

gui-libs

gtk

Flag	Description
cpu_flags_x86_f16c

media-libs

dumb-gbm

Flag	Description
epoxy

mesa

Flag	Description
d3d9
gles1
llvm
lm-sensors
opencl
osmesa
proprietary-codecs
vaapi
video_cards_
video_cards_r300
vulkan-overlay
xa
zink
zstd

opus

Flag	Description
custom-modes	Enable non-Opus modes, e.g. 44.1 kHz and 2^n frames
hardened

media-video

pipewire

Flag	Description
bluetooth
echo-cancel	Enable WebRTC-based echo canceller via <pkg>media-libs/webrtc-audio-processing</pkg>
extra	Build pw-cat/pw-play/pw-record
flatpak	Enable Flatpak support
gsettings	Use gsettings (<pkg>dev-libs/glib</pkg>) to read/save used modules (useful for e.g. <pkg>media-sound/paprefs</pkg>
ieee1394
jack-client	Install a plugin for running PipeWire as a JACK client
jack-sdk	Use PipeWire as JACK replacement
liblc3	Allow loading LC3 plugins via <pkg>media-sound/liblc3</pkg>
lv2	Allow loading LV2 plugins via <pkg>media-libs/lv2</pkg>
man
modemmanager	Combined with USE=bluetooth, allows PipeWire to perform telephony on mobile devices.
pipewire-alsa	Replace PulseAudio's ALSA plugin with PipeWire's plugin
roc	Enable roc support for real-time audio streaming over the network, using <pkg>media-libs/roc-toolkit</pkg>. See https://gitlab.freedesktop.org/pipewire/pipewire/-/wikis/Network#roc
sound-server	Provide sound server using ALSA and bluetooth devices
system-service	Install systemd unit files for running as a system service. Not recommended.
zeroconf

vkcube

Flag	Description
kms

net-p2p

qbittorrent

Flag	Description
webui

sys-apps

openrc

Flag	Description
audit
netifrc	enable Gentoo's network stack (net.* scripts)
newnet	enable the new network stack (experimental)
prefix

qingy

Flag	Description
crypt
gpm

sys-boot

grub

Flag	Description
(
)
coreboot
device-mapper	Enable support for devmapper. Required for LUKS or LVM volume detection.
efi-32
efi-64
efiemu	Build and install the efiemu runtimes
emu
fonts	Build and install fonts for the gfxterm module
ieee1275
libzfs	Enable support for <pkg>sys-fs/zfs</pkg>
loongson
mount	Build and install the grub-mount utility
multiboot
pc
qemu
qemu-mips
themes	Build and install GRUB themes (starfield)
uboot
xen
xen-32
xen-pvh

sys-devel

gcc-v3

Flag	Description
multilib
system-compiler

virtual

directfb

Flag	Description
directfb2

libudev

Flag	Description
fake

www-client

palemoon

Flag	Description
av1
cpu_flags_x86_avx
devtools
gamepad
jpegxl
necko-wifi
npapi
official-branding
optimize
system-cairo
system-extension-dirs
system-ffi
system-hunspell
system-pixman
threads

x11-apps

xinit

Flag	Description
twm

x11-base

kdrive

Flag	Description
composite
dga
dri
dri2
dri3
gbm
glamor
glx-dri
input_devices_evdev
input_devices_keyboard
input_devices_mouse
libdrm
linux_acpi
linux_apm
mitshm
present
record
tslib
xace
xf86vidmode
xfree86-utils
xselinux
xshmfence
xv
xvmc

tinyx

Flag	Description
libxfont2
xmodesetting
xvesa

xfree

Flag	Description
3dfx
3dnow
bindist
cjk
mmx
sse
xml2

x11-drivers

nvidia-drivers

Flag	Description
kernel-open	Use the open source variant of the drivers (Turing/Ampere+ GPUs only, aka GTX 1650+)
persistenced	Install the persistence daemon for keeping devices state when unused (e.g. for headless)
powerd	Install the NVIDIA dynamic boost support daemon (only useful with specific laptops, ignore if unsure)

xf86-video-nv

Flag	Description
xaa

x11-libs

cairo

Flag	Description
elibc_FreeBSD
gles2-only

gtk+

Flag	Description
adwaita-icon-theme	Force the adwaita-icon-theme
atk-bridge	Enable the gtk3-atk-bridge, hard depending on app-accessibility/at-spi2-atk and thus on sys-apps/dbus
cloudprint
vim-syntax
werror

wxGTK

Flag	Description
X11
compat26
compat28
compat30
curl
expat
graphics_ctx
gtkprint
keyring
libnotify
lzma
nodebug
pcre
spell
webkit
xrc

---