I have the following error in distutils on AIX.

======================================================================
ERROR: test_search_cpp (distutils.tests.test_config_cmd.ConfigTestCase)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/unixccompiler.py", line 166, in preprocess
    self.spawn(pp_args)
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/ccompiler.py", line 911, in spawn
    spawn(cmd, dry_run=self.dry_run)
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/spawn.py", line 34, in spawn
    _spawn_posix(cmd, search_path, dry_run=dry_run)
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/spawn.py", line 138, in _spawn_posix
    % (cmd[0], exit_status))
distutils.errors.DistutilsExecError: command 'xlc' failed with exit status 40

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/tests/test_config_cmd.py", line 47, in test_search_cpp
    match = cmd.search_cpp(pattern='xxx', body='// xxx')
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/command/config.py", line 203, in search_cpp
    src, out = self._preprocess(body, headers, include_dirs, lang)
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/command/config.py", line 126, in _preprocess
    self.compiler.preprocess(src, out, include_dirs=include_dirs)
  File "/san_cis/home/cis/.buildbot/python-aix6/3.x.phenix.xlc/build/Lib/distutils/unixccompiler.py", line 168, in preprocess
    raise CompileError(msg)
distutils.errors.CompileError: command 'xlc' failed with exit status 40

I haven't investigated yet.