Global USE flags

Flag Description Packages
X 2
clang Use Clang compiler instead of GCC 2
cpu_flags_arm_neon 2
dbus 2
debug 3
doc 3
eme-free Disable EME (DRM plugin) capability at build time 2
hardened 2
hwaccel Force-enable hardware-accelerated rendering (Mozilla bug 594876) 2
jack 2
kde Use OpenSUSE patchset to build in support for native Plasma Desktop file dialog via <pkg>kde-misc/kmozillahelper</pkg>. 2
libproxy Enable libproxy support 2
lto 2
openh264 Use <pkg>media-libs/openh264</pkg> for H.264 support instead of downloading binary blob from Mozilla at runtime 2
pgo Add support for profile-guided optimization using gcc-4.5, for faster binaries. This option will double the compile time. 2
pulseaudio Add sound server support via media-libs/libpulse (may be PulseAudio or Pipewire, or apulse if installed) 2
selinux 3
sndio Enable support for the <pkg>media-sound/sndio</pkg> backend 2
system-av1 Use the system-wide <pkg>media-libs/dav1d</pkg> and <pkg>media-libs/libaom</pkg> library instead of bundled. 2
system-harfbuzz Use the system-wide <pkg>media-libs/harfbuzz</pkg> and <pkg>media-gfx/graphite2</pkg> instead of bundled. 2
system-icu Use the system-wide <pkg>dev-libs/icu</pkg> instead of bundled. 2
system-jpeg Use the system-wide <pkg>media-libs/libjpeg-turbo</pkg> instead of bundled. 2
system-libevent Use the system-wide <pkg>dev-libs/libevent</pkg> instead of bundled. 2
system-libvpx Use the system-wide <pkg>media-libs/libvpx</pkg> instead of bundled. 2
system-png Use the system-wide <pkg>media-libs/libpng</pkg> instead of bundled (requires APNG patches) 2
system-python-libs Use system's python site instead of bundled python libraries 2
system-webp Use the system-wide <pkg>media-libs/libwebp</pkg> instead of bundled. 2
wayland 2
wifi Enable necko-wifi for NetworkManager integration, and access point MAC address scanning for better precision with opt-in geolocation services 2

Category USE flags

app-emulation

Flag Description Packages
abi_x86_32 2
abi_x86_64 2

net-misc

Flag Description Packages
cpu_flags_x86_sse4_1 2
cuda Build cuda plugin 5
donate Set the default donation level to 1% instead of 0% 2
hwloc Use <pkg>sys-apps/hwloc</pkg> for CPU affinity support 2
opencl Support AMD/Intel graphics cards 5
ssl 2

Local USE flags

app-arch

cabextract

Flag Description
extras Install experimental extra tools: wince_info and wince_rename for examining and processing Windows CE installation cabinet header files; cabinfo for examining the structure of a cab file.

unshield

Flag Description
static-libs

app-benchmarks

phoronix-test-suite

Flag Description
sdl

app-emulation

faudio

Flag Description
dumpvoices FAudio dumps buffer data to individual files with RIFF/XWMA headers, usable with players like ffplay/testxwma.
test Build and run faudio testsuite.
utils Build all faudio utilities.
xnasong Build support for optional XNG_SONG component (note: this not required by <pkg>app-emulation/wine-staging</pkg>, <pkg>app-emulation/wine-vanilla</pkg> for faudio XAudio support).

vkd3d

Flag Description
demos Build D3D12 demo programs
ncurses
opengl
spirv-tools Enable SPIRV shader debugging support using <pkg>dev-util/spirv-tools</pkg>
xcb

app-shells

eternalterminal

Flag Description
client Install network client
sentry Enable Sentry SDK crash reporting client
server Install network server
systemd
utempter Enable support for <pkg>sys-libs/libutempter</pkg>

dev-cpp

zstr

Flag Description
examples

games-fps

dhewm3

Flag Description
curl
dedicated Install only as a dedicated game server.
sdl2 Support SDL2, if disabled enable SDL1 support.

mail-client

thunderbird

Flag Description
kernel_linux
system-librnp Use system-wide <pkg>dev-util/librnp</pkg> instead of bundled one.

net-misc

xmrigcc

Flag Description
ccclient Enable "Command and Control" (CC) Client features
ccclientexec Enable "Command and Control" (CC) Client shell execution (shell execution might be a security risk)
ccserver Enable "Command and Control" (CC) Server features
http Enable built in HTTP support, this feature is used for HTTP API and daemon (solo mining) support

sys-apps

tuxclocker

Flag Description
daemon Build the system daemon
gui
hwdata Enable (optional) support for more accurate AMD GPU descriptions
plugins Enable support for plugins
video_cards_amdgpu
video_cards_nvidia

www-client

firefox

Flag Description
geckodriver Enable WebDriver support
gmp-autoupdate Allow Gecko Media Plugins (binary blobs) to be automatically downloaded and kept up-to-date in user profiles
jumbo-build Enable unified build - combines source files to speed up build process, but requires more memory
screencast
telemetry
valgrind