Global USE flags

Flag Description Packages
debug 3
doc 2
nls 3

Local USE flags

app-emulation

lxc

Flag Description
apparmor Enable AppArmor support
caps
cgmanager Enable support for cgroup management using <pkg>app-admin/cgmanager</pkg>
examples
man
pam
seccomp
selinux
ssl
templates Install old style templates through <pkg>app-emulation/lxc-templates</pkg>
tools
verify-sig

dev-haskell

gi-cairo-render

Flag Description
svg Build the Scalable Vector Graphics (SVG) backend of Cairo.

games-strategy

freeciv

Flag Description
aimodules Support for dynamically loadable AI modules (server-side)
auth Add authentication capability via mysql, postgres or sqlite3
dedicated
gtk
ipv6
mapimg Additional mag image toolkit via <pkg>media-gfx/imagemagick</pkg>
modpack Build the freeciv-modpack-program to download/install mods
mysql
qt5
readline
sdl
server Enable server support. Disabling this will also make it impossible to start local games.
sound Add support for sound provided by <pkg>media-libs/sdl-mixer</pkg>
sqlite
system-lua Use <pkg>dev-lang/lua</pkg> instead of the bundled liblua

mate-base

caja

Flag Description
introspection
mate
xmp

media-gfx

iscan-plugin-gt1500

Flag Description
minimal

media-libs

draco

Flag Description
compat Build in compatibility mode.
gltf Compile with support for glTF (GL Transmission Format) from The Khronos Group Inc.
usd

mycategory

myapp

Flag Description
symlink

myruntime

plugin-for-the-first-use-case

Flag Description
$(myapp_expand
${USE_MYAPP})
myapp

net-p2p

retroshare

Flag Description
autologin
cli Enables the CLI version of RetroShare
control-socket Enables API via Unix socket support
gnome-keyring Enables potentially insecure autologin capability via Gnome Keyring
gui
jsonapi Enables the new RetroShare JSON API
libupnp
miniupnp
service Enables the new RetroShare service controllable only through JSON API
sqlcipher Enables GXS database encryption via SQLCipher
webui Enables Web interface and API support
xapian Enables GXS content indexing and search through Xapian

sci-astronomy

stellarium

Flag Description
deep-sky Install extra deep sky objects catalog (may affect performance)
gps
media Enable sound and video support
stars Install extra star catalogs
telescope Enable telescope control via <pkg>sci-libs/indilib</pkg>
test
webengine Show online results about the selected star in an embedded window using <pkg>dev-qt/qtwebengine</pkg>