looks like ppc was dropped for 1.51, but 1.52 is from new upstream snes9x-1.43-r2.ebuild:KEYWORDS="amd64 ppc x86" snes9x-1.51.ebuild:KEYWORDS="amd64 ~ppc64 x86 ~amd64-linux ~x86-linux ~x86-solaris" snes9x-1.52.ebuild:KEYWORDS="~amd64 ~ppc64 ~x86 ~amd64-linux ~x86-linux ~x86-solaris"
Thanks for the heads up, marked ~ppc.