Global USE flags

Flag Description Packages
games Support shared score files for games 2
gsettings Use gsettings (<pkg>dev-libs/glib</pkg>) to read the system font name 2
gui 2

Local USE flags

app-editors

emacs

Flag Description
Xaw3d
acl
alsa
aqua
athena Enable the MIT Athena widget set (<pkg>x11-libs/libXaw</pkg>)
dbus
gfile Use gfile (<pkg>dev-libs/glib</pkg>) for file notification
gif
gpm
gtk
gtk2 Prefer version 2 of the GIMP Toolkit to version 3 (<pkg>x11-libs/gtk+</pkg>)
gzip-el Compress bundled Emacs Lisp source
imagemagick Use <pkg>media-gfx/imagemagick</pkg> for image processing
inotify
jpeg
kerberos
libxml2 Use <pkg>dev-libs/libxml2</pkg> to parse XML instead of the internal Lisp implementations
livecd
m17n-lib
motif
png
selinux
sound
source Install C source files and make them available for find-function
ssl
svg
tiff
toolkit-scroll-bars Use the selected toolkit's scrollbars in preference to Emacs' own scrollbars
wide-int Prefer wide Emacs integers (typically 62-bit). This option has an effect only on 32-bit systems, where it increases the maximum buffer size from 0.5 to 2 GiB, at the cost of 10% to 30% Lisp slowdown.
xft
xpm
zlib

app-emacs

bbdb

Flag Description
tex Install plain TeX support files
vm Add support for <pkg>app-emacs/vm</pkg>

whizzytex

Flag Description
doc
examples
gv Enable support for <pkg>app-text/gv</pkg>
xdvi Enable support for <pkg>app-text/xdvik</pkg>