see summary Reproducible: Always Steps to Reproduce: 1. 2. 3.
ruby collides with the system install of ruby on OSX Tiger. It doesn't on Panther. Usata, since you seem to be the one that maintains the package for OSX, can you stable it as appropriate? I masked ruby on the 10.4 profile.
I guess this bug is outdated, see bug #106996. For ppc-macos it unfortunately makes no sense any more.
Sorry I do not own ppc-macos box anymore. Please assign it to ppc-macos. (and have little time to work on Gentoo Project atm)
1.8.3 stable on mips.