On the Fedora 16 buildbot:

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ERROR: test_qualname_source (test.test_inspect.TestMain)
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Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/test/test_inspect.py", line 2414, in test_qualname_source
    module = importlib.import_module('concurrent.futures')
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/importlib/__init__.py", line 95, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1613, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1594, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1561, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 607, in _check_name_wrapper
  File "<frozen importlib._bootstrap>", line 1056, in load_module
  File "<frozen importlib._bootstrap>", line 926, in load_module
  File "<frozen importlib._bootstrap>", line 274, in _call_with_frames_removed
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/concurrent/futures/__init__.py", line 8, in <module>
    from concurrent.futures._base import (FIRST_COMPLETED,
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/concurrent/futures/_base.py", line 8, in <module>
    import threading
  File "/home/buildbot/buildarea/3.x.krah-fedora/build/Lib/threading.py", line 4, in <module>
    import _thread
ImportError: No module named '_thread'