/etc/portage/package.keywords:

dev-util/xxdiff ~ppc
media-plugins/mythdvd ~ppc
media-plugins/mythvideo ~ppc
media-tv/mythtv ~ppc
net-analyzer/ttcp ~ppc
x11-themes/mythtv-themes ~ppc


-----------------------------------
/etc/portage/package.use:

media-tv/mythtv -X -qt3 -alsa -altivec backendonly crciprec -debug -dbox2 -dts -dvb dvd -freebox -frontendonly -hdhomerun -ieee1394 -ivtv -jack -joystick -lcd -lirc -mmx vorbis -opengl perl -xvmc -video_cards_i810 -video_cards_nvidia -video_cards_via -debug -x -X -gnome -gtk -kde -qt -qt3
media-plugins/mythdvd transcode -mmx -debug
x11-libs/qt  cups gif mysql -debug -doc -examples -firebird -immqt -immqt-bc -ipv6 -nas -nis -odbc opengl -postgres -sqlite -xinerama