Global USE flags

Flag	Description	Packages
alsa		2
aot	Generate native code at build time, rather than runtime	2
bundled-libs	Install bundled versions of media-libs/openal and dev-games/physfs	3
doc		13
examples		3
firmware	Install firmware files needed for some devices	2
lzma	Enable CRC32 and CRC64 using app-arch/xz-utils	2
openmp		2
static-libs		7
test		2
zlib	Enable gzip compression, Adler-32 and CRC32 using sys-libs/zlib	3
zstd	Enable zstd compression support	2

Category USE flags

net-wireless

Flag	Description	Packages
airspy	Enable Airspy SDR support	2
json	Enable JSON output support	2
libacars	Enable decoding of ARINC-622 ATS applications using net-wireless/libacars	2
profiling	Enable profiling	2
rtlsdr	Enable RTL-SDR SDR support	3
soapy	Enable SoapySDR support	2
sqlite		2
zeromq	Enable ZeroMQ output	2

Local USE flags

app-crypt

xsum

Flag	Description
blake2	Enable BLAKE2 hashes using app-crypt/libb2
cppcrypto	Enable support for dev-libs/cppcrypto
crypto++	Enable support for dev-libs/crypto++
gcrypt	Enable support for dev-libs/libgcrypt
glib	Enable support for dev-libs/glib
gnutls
mbedtls	Enable support for net-libs/mbedtls
mhash
nettle	Enable support for dev-libs/nettle
nss	Enable support for dev-libs/nss
openssl	Enable support for dev-libs/openssl
rhash	Enable support for app-crypt/rhash
sodium	Enable support for dev-libs/libsodium
xxhash	Enable support for dev-libs/xxhash

app-misc

jdupes

Flag	Description
debug
kernel_linux
low_memory	Build for low memory usage at the expense of speed and features

dev-lang

deno

Flag	Description
bash-completion
fish-completion	Enable fish completion support
zsh-completion

games-arcade

stepmania

Flag	Description
cpu_flags_x86_sse2
crash-handler	Enable the custom crash handler
default-songs	Install the songs that are distributed with the game by default
ffmpeg
gles2	Enable support for OpenGL ES 2
gtk
jack
jpeg
mp3
networking	Enable network-related functionality
ogg
oss
parport	Enable support for lights connected to the parallel port
pulseaudio
wav	Enable support for WAV audio files

media-fonts

humble-indie-font-bundle

Flag	Description
after-impact	Install the "After Impact" font
bike-courier	Install the "Bike Courier" font
cosmic-sans	Install the "Cosmic Sans" font
halfvetica	Install the "Halfvetica" font
sans-sans	Install the (non-free) "Sans Sans" font
times-old-roman	Install the (non-free) "Times Old Roman" font
unicharacter	Install the (non-free) "Unicharacter" font

ultimate-oldschool-pc-font-pack

Flag	Description
otb-bm	Install bitmap only font variants (OpenType bitmap)
ttf-ac	Install aspect-corrected font variants (TrueType)
ttf-mx	Install "mixed" bitmap+outline font variants (TrueType)
ttf-px	Install outlined font variants (TrueType)

media-gfx

impack

Flag	Description
(
)
de

impack2

Flag	Description
X
argon2	Use app-crypt/argon2 for password hashing (requires USE=crypt)
avif	Add support for AVIF images
bmp	Add support for BMP images
brotli	Enable brotli compression support
bzip2
crypt
flif	Enable support for FLIF images
heif	Enable support for HEIF/HEIC images
jpeg2k
jpegls	Enable support for JPEG-LS images
jxl
jxr	Enable support for JPEG XR images
png
tiff
webp

media-libs

flif

Flag	Description
sdl

media-sound

musyng-kite-soundfont

Flag	Description
timidity

net-misc

usbip

Flag	Description
tcpd

net-wireless

acarsdec

Flag	Description
mqtt	Enable output over MQTT
sndfile

dumphfdl

Flag	Description
kafka	Enable Apache Kafka output
sdr	Enable SDR input using net-wireless/soapysdr

dumpvdl2

Flag	Description
protobuf	Enable binary format support using dev-libs/protobuf-c
sdrplay	Enable SDRplay support

libacars

Flag	Description
xml

satdump

Flag	Description
cpu_flags_arm_neon
cpu_flags_x86_sse4_1
gles	Use OpenGL ES for the GUI
gui
opencl
satdump_plugins_
satdump_plugins_aim	Enable AIM support
satdump_plugins_airspy_sdr	Enable Airspy SDR support
satdump_plugins_analog	Enable analog protocols
satdump_plugins_aws	Enable AWS (Sterna) support
satdump_plugins_bladerf_sdr	Enable BladeRF SDR support
satdump_plugins_bluewalker3	Enable BlueWalker-3 support
satdump_plugins_bochum	Enable Bochum support
satdump_plugins_cluster	Enable CLUSTER support
satdump_plugins_cubesat	Enable support for CubeSats
satdump_plugins_dmsp	Enable DMSP support
satdump_plugins_dscovr	Enable DSCOVR support
satdump_plugins_dvb	Enable DVB-S/DVB-S2 support
satdump_plugins_elektro_arktika	Enable Elektro/Arktika (RDAS, xRIT, etc.) support
satdump_plugins_eos	Enable EOS (Aqua, Terra, Aura) support
satdump_plugins_fy2	Enable FengYun-2 (S-VISSR, etc.) support
satdump_plugins_fy3	Enable FengYun-3 (AHRPT, MPT, DPT, etc.) support
satdump_plugins_fy4	Enable FengYun-4 (LRIT, HRIT) support
satdump_plugins_gcom	Enable GCOM support
satdump_plugins_geonetcast	Enable GeoNetCast support
satdump_plugins_gk2a	Enable GK2A (xRIT, etc.) support
satdump_plugins_goes	Enable GOES (GVAR, HRIT, GRB, etc.) support
satdump_plugins_gvar_extended	Enable the GVAR extended plugin
satdump_plugins_hackrf_sdr	Enable HackRF SDR support
satdump_plugins_himawari	Enable Himawari support
satdump_plugins_hinode	Enable Hinode support
satdump_plugins_inmarsat	Enable Inmarsat support
satdump_plugins_jason3	Enable Jason-3 (S-Band dumps) support
satdump_plugins_jpss	Enable JPSS (SNPP, JPSS-1, etc.) support
satdump_plugins_landsat	Enable LandSat support
satdump_plugins_limesdr_sdr	Enable LimeSDR support
satdump_plugins_mats	Enable MATS support
satdump_plugins_meteor	Enable Meteor (HRPT, LRPT, etc.) support
satdump_plugins_meteosat	Enable Meteosat support
satdump_plugins_mirisdr_sdr	Enable MiriSDR SDR support
satdump_plugins_net_source_sdr	Enable network source SDR support
satdump_plugins_noaa_metop	Enable NOAA/MetOp (AHRPT, HRPT, X-Band dumps, GAC, etc.) support
satdump_plugins_oceansat	Enable Oceansat (X-Band, etc.) support
satdump_plugins_orbcomm	Enable Orbcomm support
satdump_plugins_others	Enable support for a few other constellations
satdump_plugins_plutosdr_sdr	Enable PlutoSDR SDR support
satdump_plugins_portaudio_sink	Enable audio output using media-libs/portaudio
satdump_plugins_proba	Enable Proba (1, 2, V, etc.) support
satdump_plugins_remote_sdr	Enable remote SDR support
satdump_plugins_rfnm_sdr	Enable RFNM SDR support
satdump_plugins_rtaudio_sdr	Enable input support using media-libs/rtaudio
satdump_plugins_rtaudio_sink	Enable audio output using media-libs/rtaudio
satdump_plugins_rtlsdr_sdr	Enable RTL-SDR SDR support
satdump_plugins_rtltcp	Enable RTL-TCP support
satdump_plugins_scripting	Enable experimental scripting support
satdump_plugins_sddc_sdr	Enable SDDC SDDC (RX666, RX888, etc.) SDR support
satdump_plugins_sdrplay_sdr	Enable SDRplay SDR support
satdump_plugins_sdrpp_server	Enable SDR++ server support
satdump_plugins_soapy_sdr	Enable SoapySDR support (not recommended)
satdump_plugins_spacex	Enable SpaceX support
satdump_plugins_spyserver	Enable SpyServer support
satdump_plugins_standard_cpp_compos	Enable standard C++ composites
satdump_plugins_stereo	Enable STEREO probes support
satdump_plugins_tubsat	Enable TUBSAT (TUBIN, etc.) support
satdump_plugins_umka	Enable UmKA support
satdump_plugins_usrp_sdr	Enable USRP SDR support
satdump_plugins_wsf	Enable WSF (WSF-M) support
tools	Build and install additional tools
ziq2	Enable the experimental ZIQ2 file format

sci-libs

comedilib

Flag	Description
pdf	Install documentation in PDF format
python
scxi	Build the SCXI convenience library
udev

sys-apps

zenstates

Flag	Description
togglecode	Install the togglecode utility (needs dev-python/portio)

sys-kernel

reiser4-sources

Flag	Description
experimental	Apply experimental patches; for more information, see "https://wiki.gentoo.org/wiki/Project:Kernel/Experimental".

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