localhost ~ # equery uses amarok
[ Searching for packages matching amarok... ]
[ 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 media-sound/amarok-1.4.6-r1 ]
 U I
 + + arts            : Adds support for aRts: the KDE sound daemon
 - - daap            : Enable support for DAAP Music Sharing
 - - 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 .
 - - elibc_FreeBSD   : <unknown>
 + + ifp             : Enable support for iRiver devices access through libifp
 + + ipod            : Enable support for iPod device access
 + + kde             : Adds support for kde-base/kde (K Desktop Enviroment)
 - + linguas_af      : <unknown>
 - + linguas_ar      : <unknown>
 - + linguas_az      : <unknown>
 - - linguas_be      : <unknown>
 - + linguas_bg      : <unknown>
 - + linguas_bn      : <unknown>
 - + linguas_br      : <unknown>
 - + linguas_ca      : <unknown>
 - + linguas_cs      : <unknown>
 - + linguas_cy      : <unknown>
 - + linguas_da      : <unknown>
 - + linguas_de      : <unknown>
 - + linguas_el      : <unknown>
 - + linguas_en_GB   : <unknown>
 - + linguas_eo      : <unknown>
 - + linguas_es      : <unknown>
 - + linguas_et      : <unknown>
 - + linguas_eu      : <unknown>
 - + linguas_fa      : <unknown>
 - + linguas_fi      : <unknown>
 - + linguas_fr      : <unknown>
 - + linguas_ga      : <unknown>
 - + linguas_gl      : <unknown>
 - + linguas_he      : <unknown>
 - + linguas_hi      : <unknown>
 - + linguas_hu      : <unknown>
 - - linguas_id      : <unknown>
 - + linguas_is      : <unknown>
 - + linguas_it      : <unknown>
 - + linguas_ja      : <unknown>
 - + linguas_km      : <unknown>
 - + linguas_ko      : <unknown>
 - - linguas_ku      : <unknown>
 - - linguas_lo      : <unknown>
 - + linguas_lt      : <unknown>
 - + linguas_mk      : <unknown>
 - + linguas_ms      : <unknown>
 - + linguas_nb      : <unknown>
 - + linguas_nds     : <unknown>
 - + linguas_nl      : <unknown>
 - + linguas_nn      : <unknown>
 - + linguas_pa      : <unknown>
 - + linguas_pl      : <unknown>
 - + linguas_pt      : <unknown>
 - + linguas_pt_BR   : <unknown>
 - + linguas_ro      : <unknown>
 - + linguas_ru      : <unknown>
 - + linguas_rw      : <unknown>
 - + linguas_se      : <unknown>
 - + linguas_sk      : <unknown>
 - + linguas_sl      : <unknown>
 - - linguas_sq      : <unknown>
 - + linguas_sr      : <unknown>
 - + linguas_sr@Latn : <unknown>
 - + linguas_ss      : <unknown>
 - + linguas_sv      : <unknown>
 - + linguas_ta      : <unknown>
 - + linguas_tg      : <unknown>
 - - linguas_th      : <unknown>
 - + linguas_tr      : <unknown>
 - + linguas_uk      : <unknown>
 - + linguas_uz      : <unknown>
 - + linguas_zh_CN   : <unknown>
 - + linguas_zh_TW   : <unknown>
 - - mp4             : Enable write support for tags in MP4 files (M4A). The resulting Amarok copy is not redistributable.
 + + mtp             : Enable support for libMTP (Plays4Sure) devices access through libmtp
 + + musicbrainz     : Lookup audio metadata using MusicBrainz community service (musicbrainz.org)
 - - mysql           : Adds mySQL Database support
 + + njb             : Enable support for NJB (Creative) devices access through libnjb
 - - noamazon        : <unknown>
 - + opengl          : Adds support for OpenGL (3D graphics)
 - - postgres        : Adds support for the postgresql database
 + + python          : Adds support/bindings for the Python language
 - - real            : Build with real/helix player support
 + + visualization   : Support visualization plugins through media-libs/libvisual
 + + xinerama        : Add support for the xinerama X11 extension, which allows you to stretch your display across multiple monitors
localhost ~ #