The xbmc ebuild has the goom visualization explicitly enabled but it doesn't appear to build it. The build log supports this with the following two lines: configure: == GOOM disabled. == configure: Skipping configuration of submodule xbmc/visualizations/Goom/goom2k4-0. The configuration summary claims that goom support is enabled but that is only because '--enable-goom' is passed to configure. The goom visualization should be listed in 'xbmc->settings->add-ons->enabled add-ons->visualization' but only opengl spectrum, projectm and waveform are available. I have tested with media-tv/xbmc-9999 only.
Created attachment 287685 [details] build log
Created attachment 287687 [details] emerge --info
bugs in live xbmc code really should go upstream