Strange Xcode problems

I have been working with torque for a few months now, and using Xcode I've never really had any problems. But now, for some reason, whenever I try to compile, it fails due to one error:
Undefined symbols: _vorbis_info_blocksize
Obviously this is some problem with the ogg code. But the weird part is that it says Location: pb:0. When I double-click it, it just opens the pb folder. I re-downloaded the entire head from CVS, and tried compiling it w/o any source changes, and it still gave me this error. Ideas?

EDIT: By the way, I'm running OS X 10.3.3, on an iBook G3 800MHz.