Global USE flags

Flag	Description	Packages
X	Build support for X	6
alsa		7
ao		3
debug		2
dedicated		2
joystick	Enable support for input devices with evdev	2
lto	Build using Link Time Optimizations (LTO)	2
pulseaudio		9
qt5	Build the QT frontend	3
sdl	Use <pkg>media-libs/libsdl</pkg> instead of <pkg>media-libs/libsdl2</pkg>	4
system-ffmpeg	Use the system-wide <pkg>media-video/ffmpeg</pkg> instead of bundled.	2
udev		4

Category USE flags

games-emulation

Flag	Description	Packages
egl	Enable EGL support	2
evdev	Support EVDev controller interface	2
ffmpeg	FFMpeg (ffmpeg)	3
gbm	Support DRM/KMS OpenGL contexts	2
gles	Enable GLES support	2
gles2	Enable support for GLES2	4
gles3	Enable GLES3 support	2
libretro	Build libretro core	2
materialui	Enable MaterialUI menu	2
neon		2
openal		2
opengl		10
ozone	Enable ozone menu	2
rgui	Enable rgui menu	2
sdl2	Use <pkg>media-libs/libsdl2</pkg> instead of <pkg>media-libs/libsdl</pkg>	2
vulkan	Enable vulkan support	9
wayland		4
xmb	Enable XMB menu	2
xv		2
zlib		2

games-util

Flag	Description	Packages
steamruntime	Use the official steam runtime libraries	3

media-sound

Flag	Description	Packages
portaudio		2

net-wireless

Flag	Description	Packages
kernel_linux		2

Local USE flags

app-admin

webmin

Flag	Description
ldap
minimal
mysql
postgres

app-cdr

xcdroast

Flag	Description
nls
suid

app-misc

g15daemon

Flag	Description
perl
static-libs

dev-libs

dynarmic

Flag	Description
test

games-emulation

bsnes-hd

Flag	Description
oss

citra

Flag	Description
web-service	Enable web services (telemetry, etc.)

duckstation

Flag	Description
discord	Enable Discord Rich Presence to show the current game on Discord
fbdev	Support FBDev OpenGL contexts
gamepad	Link with SDL2 for controller support
nogui	Build the NoGUI frontend
retroachievements	Build with RetroAchievements supports

emulationstation-themes-meta

Flag	Description
carbon	Carbon Theme
carbon-centered	Carbon-Centered Theme
carbon-nometa	Carbon theme without the metadata
clean-look	Clean-Look Theme
color-pi	Color-Pi Theme
nbba	NBBA Theme
pixel	Pixel Theme
simple	Simple Theme
simple-dark	Simple Dark Theme
simplified-static-canela	Simplified Static Canela Theme
turtle-pi	Turtle Pi Theme
zoid	Zoid Theme

libretro-meta

Flag	Description
2048	2048 Game Clone
3dengine	Test Core - 3D Engine
81	Sinclair - ZX 81 (EightyOne)
\
atari800	Atari - 5200 (Atari800)
bk	BK-0010/0011/Terak 8510a (bk)
blastem	Sega Genesis (blastem)
bluemsx	MSX/SVI/ColecoVision/SG-1000 (blueMSX)
bnes	Nintendo - NES / Famicom (bnes)
boom3
bsnes	Nintendo - SNES / SFC (bsnes)
bsnes-mercury	Nintendo - SNES / SFC (bsnes-mercury)
cannonball	OutRun Engine
cap32	Amstrad - CPC (Caprice32)
chailove	2D Game Framework (chailove)
citra	Nintendo - 3DS (Citra)
craft	Minecraft (Craft)
crocods	Amstrad - CPC (CrocoDS)
desmume	Nintendo - DS (DeSmuME)
dinothawr	Dinothawr
dolphin	Nintendo Gamecube/Wii (dolphin)
dosbox	DOS (DOSBox)
dosbox-svn	DOS (DOSBox TRUNK)
duckstation	Sony Playstation (duckstation)
ecwolf	Wolfenstein 3D (ecwolf)
fbalpha	Arcade (FB Alpha)
fbalpha2012	Arcade (FB Alpha 2012)
fbneo	Arcade (FBNeo)
fceu-next	Nintendo - NES / Famicon (fceu-next)
fceumm	Nintendo - NES / Famicom (FCEUmm)
flycast	Sega - Dreamcast/NAOMI (Flycast)
fmsx	Microsoft - MSX (fMSX)
freechaf	Fairchild Channel F / Video Entertainment System (freechaf)
freeintv	Mattel - Intellivision (FreeIntv)
frodo	Commodore 64 (frodo)
fuse	ZX Spectrum (Fuse)
gambatte	Nintendo - Game Boy / Color (Gambatte)
gearboy	Nintendo Game Boy / Color (gearboy)
gearsystem	Sega consoles (gearsystem)
genesis_plus_gx	Sega Genesis / Megadrive (genesis_plus_gx)
genesis_plus_gx_wide	Sega Genesis / Megadrive (genesis_plus_gx)
gme	Game Music Emu (gme)
gong	Pong (gong)
gpsp	Nintendo - Game Boy Advance (gpSP)
gw	Handheld Electronic (GW)
handy	Atari - Lynx (Handy)
hatari	Atari ST/STE/TT/Falcon (hatari)
lowresnx	Simulated retro console (lowresnx)
lutro	Lua Engine (Lutro)
mame2000	Arcade (MAME 2000)
mame2003	Arcade (MAME 2003)
mame2003_plus-libretro	Arcade (MAME 2003 Plus)
mame2010	Arcade (MAME 2010)
mame2015	Arcade (MAME 2015)
mednafen-bsnes	Nintendo - SNES / SFC (Beetle bsnes)
mednafen-gba	Nintendo - Game Boy Advance (Beetle GBA)
mednafen-lynx	Atari - Lynx (Beetle Handy)
mednafen-ngp	SNK - Neo Geo Pocket / Color (Beetle NeoPop)
mednafen-pce	NEC - PC Engine / CD (Beetle PCE)
mednafen-pce-fast	NEC - PC Engine / CD (Beetle PCE FAST)
mednafen-pcfx	NEC - PC-FX (Beetle PC-FX)
mednafen-psx	Sony - PlayStation (Beetle PSX)
mednafen-psx-hw	Sony - Playstation (Beetle PSX HW)
mednafen-saturn	Sega - Saturn (Beetle Saturn)
mednafen-supafaust	Nintendo Super NES (Beetle Supafaust)
mednafen-supergrafx	NEC - PC Engine SuperGrafx (Beetle SuperGrafx)
mednafen-vb	Nintendo - Virtual Boy (Beetle VB)
mednafen-wswan	Bandai - WonderSwan/Color (Beetle Cygne)
melonds	Nintendo - DS (melonDS)
meowpc98	NEC - PC-98 (Neko Project II)
mesen	Nintendo Super NES (mesen)
mesens	Nintendo Super NES (mesen S)
mess2015	Multi systems (MESS 2015)
meteor	Nintendo - Game Boy Advance (Meteor)
mgba	Nintendo - Game Boy Advance (mGBA)
mrboom	Mr.Boom (Bomberman)
mu	PalmOS (mu)
mupen64	Nintendo 64 (mupen64-next)
neocd	SNK NeoGeo CD (neocd)
nestopia	Nintendo - NES / Famicom (Nestopia UE)
np2kai	PC-98 (np2kai)
nxengine	Cave Story (NXEngine)
o2em	Magnavox - Odyssey2 / Phillips Videopac+ (O2EM)
oberon	Oberon (oberon)
openlara	Tomb Raider (OpenLara)
opera	Panasonic 3DO (opera)
parallel_n64	Nintendo - Nintendo 64 (ParaLLEl N64)
pcsx-rearmed	Sony - PlayStation (PCSX ReARMed)
picodrive	Sega - MS/MD/CD/32X (PicoDrive)
pocketcdg	PocketCDG
pokemini	Nintendo - Pokemon Mini (PokeMini)
potator	Watara SuperVision (potator)
ppsspp	Sony PSP (ppsspp)
prboom	Doom (PrBoom)
prosystem	Atari - 7800 (ProSystem)
puae	Commodore - Amiga (P-UAE)
puae2021
px68k	Sharp - X68000 (PX68k)
quasi88	NEC - PC-8000 / PC-8800 series (QUASI88)
quicknes	Nintendo - NES / Famicom (QuickNES)
race	SNK NeoGeo Pocket Color (race)
reminiscence	Flashback (REminiscence)
retro8	PICO-8 (retro8)
retrodream	Sega Dreamcast (retrodream)
sameboy	Nintendo - Game Boy / Color (SameBoy)
scummvm	ScummVM (scummvm)
smsplus	Sega Master System (smsplus)
snes9x	Nintendo - SNES / SFC (Snes9x - Current)
snes9x2002	Nintendo - SNES / SFC (Snes9x 2002)
snes9x2005	Nintendo - SNES / SFC (Snes9x 2005)
snes9x2010	Nintendo - SNES / SFC (Snes9x 2010)
squirreljme	Java ME 8 (squirreljme)
stella2014	Atari - 2600 (Stella 2014)
swanstation
tgbdual	Nintendo - Game Boy / Color (TGB Dual)
theodore	Thomson - MO/TO (Theodore)
thepowdertoy	PowderToy (thepowdertoy)
tic80	Custom Game library (tic80)
tyrquake	Quake (TyrQuake)
uzem	Development Machine (uzem)
vba-next	Nintendo - Game Boy Advance (VBA Next)
vbam	Nintendo - Game Boy Advance (VBA-M)
vecx	GCE - Vectrex (vecx)
vemulator	Sega VMU (vemulator)
vice-x128	Commodore 8-bit (vice)
vice-x64	Commodore 8-bit (vice)
vice-x64sc	Commodore 8-bit (vice)
vice-xcbm2	Commodore 8-bit (vice)
vice-xcbm5x0	Commodore 8-bit (vice)
vice-xpet	Commodore 8-bit (vice)
vice-xplus4	Commodore 8-bit (vice)
vice-xscpu64	Commodore 8-bit (vice)
vice-xvic	Commodore 8-bit (vice)
virtualjaguar	Atari - Jaguar (Virtual Jaguar)
vitaquake2	Quake II (vitaquake2)
vitaquake3	Quake III (vitaquake3)
x1	Sharp X1 (x1)
xrick	Rick Dangerous (XRick)
yabause	Sega - Saturn (Yabause)"

mednafen-psx-hw-libretro

Flag	Description
cdrom

melonds

Flag	Description
jit

mgba-libretro

Flag	Description
epoxy	Libepoxy support
lzma
pgo	Build using Profile Guided Optimization (PGO)
pgopost	Make use of PGO
png
zip

mupen64next-libretro

Flag	Description
rpi
rpi2
rpi3
rpi4

np2kai

Flag	Description
haxm	Enable haxm emulation
i286	Enable i286 emulation USE="ia32" or USE="haxm" will disable it, unless all 3 emulation USE flags are set
ia32	Enable ia32 emulation

reicast

Flag	Description
openmp
ta-lle	Enable TA LLE

retroarch

Flag	Description
cg	Enable Cg shader support
cpu_flags_x86_sse
dbus
flac
freetype	Enable FreeType support
gamemode
kms	Enable KMS context support
libcaca
libusb	Enable LibUSB HID support
miniupnpc	Enable Mini UPnP client library (for NAT traversal)
opengl_core
parport
plain_drm
qt	Enable QT support
raspberry-pi
sixel	Enable libsixel support
ssl
stripes	Enable stripes menu
subtitles	Enable subtitles support
systemd
tinyalsa	Enable TinyALSA support
xrandr	Enable xrandr support

rpcs3

Flag	Description
faudio	Enable audio rendering with app-emulation/faudio
llvm	LLVM recompiler support

vba-next-libretro

Flag	Description
tiled_rendering	Enable tiled rendering

games-sports

stuntrally

Flag	Description
editor	Install game editor
game	Install game files

games-util

steam-client-meta

Flag	Description
steamfonts	Use official fonts from Valve's steam client
steamvr	Enable SteamVR virtual reality support
trayicon	Enable system tray icon with libappindicator
video_cards_intel
video_cards_nvidia

media-fonts

powerline-fonts

Flag	Description
(
)
3270	Install Powerline-patched 3270 fonts
anonymouspro	Install Powerline-patched Anonymous Pro fonts
arimo	Install Powerline-patched Arimo fonts
cousine	Install Powerline-patched Cousine fonts
dejavusansmono	Install Powerline-patched DejaVu Sans Mono fonts
droidsansmono	Install Powerline-patched Droid Sans Mono fonts
droidsansmonodotted	Install Powerline-patched Droid Sans Mono Dotted fonts
droidsansmonoslashed	Install Powerline-patched Droid Sans Mono Slashed fonts
firamono	Install Powerline-patched Fira Mono fonts
gomono	Install Powerline-patched Go Mono fonts
hack	Install Powerline-patched Hack fonts
inconsolata	Install Powerline-patched Inconsolata fonts
inconsolata-g	Install Powerline-patched Inconsolata-g fonts
inconsolatadz	Install Powerline-patched Inconsolata-dz fonts
liberationmono	Install Powerline-patched Liberation Mono fonts
meslodotted	Install Powerline-patched Meslo Dotted fonts
mesloslashed	Install Powerline-patched Meslo Slashed fonts
monofur	Install Powerline-patched Monofur fonts
notomono	Install Powerline-patched Noto Mono fonts
novamono	Install Powerline-patched Nova Mono fonts
profont	Install Powerline-patched ProFont fonts
robotomono	Install Powerline-patched Roboto Mono fonts
sourcecodepro	Install Powerline-patched Source Code Pro fonts
spacemono	Install Powerline-patched Space Mono fonts
symbolneu	Install Powerline-patched Symbol Neu fonts
terminus_pcf	Install Powerline-patched Terminus fonts in PCF format
tinos	Install Powerline-patched Tinos fonts
ubuntumono	Install Powerline-patched Ubuntu Mono fonts

media-sound

carla

Flag	Description
gtk
gtk2	Build with support for plugins using GTK+ 2
juce	Build with support for plugins using JUCE
osc
rdf	Get extra information from LADSPA plugins
sf2	Build with SF2 support using fluidsynth
sndfile

catnip

Flag	Description
fftw

librespot

Flag	Description
jack

vgmplay

Flag	Description
opl	Enable playback on obsolete OPL hardware (AdLib, SoundBlaster)

net-im

franz-bin

Flag	Description
gnome-keyring

net-wireless

hcxdumptool

Flag	Description
gpio	Build with GPIO support

sys-process

nvtop

Flag	Description
unicode

x11-apps

lightdm-gtk-greeter-settings

Flag	Description
xfce	Adds <pkg>x11-apps/lightdm-gtk-greeter-settings</pkg> to Xfce settings manager

x11-plugins

pidgin-telegram

Flag	Description
webp

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