[yz@test pdb-clone]$ python setup.py build
Traceback (most recent call last):
  File "setup.py", line 12, in <module>
    from test import test_support as support    # Python 2
  File "/usr/lib64/python2.7/test/test_support.py", line 22, in <module>
    import _testcapi
ImportError: No module named _testcapi