xawtv 3.81 ebuild assumes that you have mmx. see xaw-deinterlace-3.76-0.1.0.diff
line 279 (which creates xawtv-3.81/libng/plugins/linear_blend.c line 36):
this obviously causes problems on my ppc (and other non-mmx machines). the
ebuild should check if USE includes "mmx" and only define MMX if that is the case.
once this is fixed, the ebuild can be keyworded ~ppc as well as what is there
now (aside from the MMX issue, xawtv compiles and runs on my ppc).
please test versions 3.80 and 3.81
tested, looks fine. added ~ppc keyword.