I just got a build of the demo app going under xcode - after some hitches, which I thought I’d report to save others the trouble.
If you see hundreds of errors like “Stdlib.h: File or directory not found”, try changing the SDK (the pulldown in the top left-hand corner of each project) to be the most recent version (in my case, 10.6) - it worked for me.
I’m using xcode 3.2.1, OS/X 10.6.2.