Because I wanted to install clee’s updated SPC player plugin for gstreamer, I went and created a couple of ebuilds for Gentoo Linux.
The overlay for Portage is here, and includes two ebuilds, one for the required libopenspc library, and another for gst-spc. Note that if you install libopenspc, then the gst-plugins-bad-0.10.4 package also contains the gst-spc plugin. I didn’t feel like installing all the broken plugins just for spc which is why I split it out into a separate ebuild (you also save all the download time ;-).
In theory libopenspc and gst-spc should work on non-x86 platforms, unlike the last version of gst-spc that clee and I developed. It works just fine so far in AMD64 and I can’t see any reason why PPC would be different (except for endianness ;) so feel free to try it out.
Looking for good SPC music? I recommend Zophar’s Domain or SNES Music. The soundtracks for any of the Final Fantasy games are good, along with Donkey Kong Country (IMHO).
At some point I need to finish my taglib bindings for SPC support so I can work on making SPCs play in JuK. :-)