chadwick temp # equery u celestia
[ Searching for packages matching celestia... ]
[ Colour Code : set unset ]
[ Legend        : Left column  (U) - USE flags from make.conf                     ]
[                  : Right column (I) - USE flags packages was installed with ]
[ Found these USE variables for sci-astronomy/celestia-1.4.1-r1 ]
 U I
 + + arts    : Adds support for aRts: the KDE sound daemon
 - - cairo   : Enable support for the cairo graphics library
 - - debug   : Enable extra debug codepaths, like asserts and extra output. If you want to get 
meaningful backtraces see http://www.gentoo.org/proj/en/qa/backtraces.xml .
 - - gnome   : Adds GNOME support
 + + gtk     : Adds support for x11-libs/gtk+ (The GIMP Toolkit)
 + + kde     : Adds support for kde-base/kde (K Desktop Enviroment)
 - - lua     : Enable Lua scripting support
 + + nls     : Adds Native Language Support (using gettext - GNU locale utilities)
 - - threads : Adds threads support for various packages. Usually pthreads