After a pretty long hiatus, the Mac OS X/PowerPC builds are back. The plan is to have a fully supported PowerPC build for at least this release. Gem is currently not included in the Mac OS X builds, but will be again soon, but otherwise, please try this build and let me know how it works for you:
http://autobuild.puredata.info/auto-build/latest/
.hc
Access to computers should be unlimited and total. - the hacker ethic