Category USE flags

www-client

Flag Description Packages
selinux 2
wayland 2

Local USE flags

www-client

librewolf

Flag Description
X
clang Use Clang compiler instead of GCC
dbus
debug
eme-free Disable EME (DRM plugin) capability at build time
gmp-autoupdate Allow Gecko Media Plugins (binary blobs) to be automatically downloaded and kept up-to-date in user profiles
hardened
hwaccel Force-enable hardware-accelerated rendering (Mozilla bug 594876)
jack
jpegxl
jumbo-build Enable unified build - combines source files to speed up build process, but requires more memory
libproxy Enable libproxy support
openh264 Use <pkg>media-libs/openh264</pkg> for H264 support instead of downloading binary blob from Mozilla at runtime
pgo Add support for profile-guided optimization for faster binaries - this option will double the compile time
pulseaudio Add sound server support via media-libs/libpulse (may be PulseAudio or Pipewire, or apulse if installed)
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-harfbuzz Use the system-wide <pkg>media-libs/harfbuzz</pkg> instead of bundled and <pkg>media-gfx/graphite2</pkg> in most cases
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
telemetry
test
valgrind
wasm-sandbox Sandbox certain third-party libraries through WebAssembly using RLBox
wifi Enable necko-wifi for NetworkManager integration, and access point MAC address scanning for better precision with opt-in geolocation services