distccdworking, so now my ancient PowerPC iMac actually has all its code compiled by a semi-modern dual-core AMD machine. Woohoo!
Most of this was Gentoo magic that worked right out of the box, at least for portage. I still have not been able to prove to myself that I can actually use
distccmanually as well. Of course that's not nearly as important... :-D
Next I have to try pump mode, and then it's off to setting up the old SPARC box I have lying around, also with
distccmost likely. (It's equally straightforward to generate another cross-compiler using Gentoo's crossdev script. Sweet.)