root@helix/usr/portage# equery list alsa
[ Searching for package 'alsa' in all categories among: ]
 * installed packages
[I--] [ -] games-emulation/mupen64-alsasnd-0.4 (0)
[I--] [  ] media-libs/alsa-lib-1.0.11 (0)
[I--] [  ] media-plugins/gst-plugins-alsa-0.8.11 (0.8)
[I--] [  ] media-plugins/gst-plugins-alsa-0.10.4 (0.10)
[I--] [  ] media-plugins/xmms-alsa-1.2.10-r2 (0)
[I--] [  ] media-sound/alsa-headers-1.0.11 (0)
[I--] [  ] media-sound/alsa-utils-1.0.11 (0.9)
[I--] [  ] media-sound/alsamixergui-0.9.0.1.2-r4 (0)