For the pch file I get these errors:
/Users/matt/Programming/iPhone Monkey Curling lite/iPhone_Monkey_Curling_Prefix.pch:6:34: error: Foundation/Found
On the Apple developer forums I managed to get help on pin-pointing the issue. It turns out somehow a build option was set to something odd.
It was the "Framework Search Paths" option. Make sure this is empty if anyone has a similar problem.