the error is different now that _LARGEFILES is defined:
======================================================================
ERROR: test_large_file_ops (__main__.CIOTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "./Lib/test/test_io.py", line 418, in test_large_file_ops
self.large_file_ops(f)
File "./Lib/test/test_io.py", line 321, in large_file_ops
self.assertEqual(f.seek(self.LARGE), self.LARGE)
IOError: [Errno 22] Invalid argument
======================================================================
ERROR: test_large_file_ops (__main__.PyIOTest)
----------------------------------------------------------------------
Traceback (most recent call last):
File "./Lib/test/test_io.py", line 418, in test_large_file_ops
self.large_file_ops(f)
File "./Lib/test/test_io.py", line 321, in large_file_ops
self.assertEqual(f.seek(self.LARGE), self.LARGE)
IOError: [Errno 22] Invalid argument