Okay, I don't know why, but for some reason it doesn't compile in the .xcode version of the project, but if you open the .pbproj version, it works just fine.
On a similar note, I was trying to compile OmniJava, and I got an error that I was missing the file "System/Library/Frameworks/JavaVM.framework/Headers/jni.h". Sure enough, I looked, and though there was an alias there, it didn't point to anything. Am I missing something.