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The problem is not with your ucs4 build, this call always fails 
under MacOSX. The problem is that the 'sysu' gestalt selector isn't 
available under OSX.

The code in _mac_ver_lookup does a try/except on RuntimeError 
around the call to gestalt, but I don't remember MacOS.Error ever 
being a subclass of RuntimeError. Currently MacOS.Error is in a 
class by itself, it should probably be an OSError subclass, but that 
still won't fix this.

I suggest doing the try/except on MacOS.Error.