Is there a recent Gentoo Image for the PPC based boxes? Portage is broken on the older image from circa 2008.
I tried for ever and a day trying to patch up the old out of date version but gave it up in the end as a bad job. I then followed the instructions in the Gentoo handbook for doing a clean install and it worked a treat, saving loads of time. Just wish I'd done that at the beginning as I reckon I lost about a day and half trying to 'force' the updates. Oh well you learn by practice they say.