"Thanks to" my commit r78826 (fixing #3137), site errors are now fatal: Python exits with an error instead of just printing "import site failed; ...". It's the come back of #7774: test_executable_with_cwd of test_subprocess now always fail.

The test fails because of an error raise by the site module:
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Traceback (most recent call last):
  File "Lib/site.py", line 542, in <module>
    main()
  File "Lib/site.py", line 524, in main
    known_paths = addusersitepackages(known_paths)
  File "Lib/site.py", line 257, in addusersitepackages
    user_site = getusersitepackages()
  File "Lib/site.py", line 239, in getusersitepackages
    user_base = getuserbase() # this will also set USER_BASE
  File "Lib/site.py", line 229, in getuserbase
    USER_BASE = get_config_var('userbase')
  File "/home/SHARE/SVN/python-trunk/Lib/sysconfig.py", line 494, in get_config_var
    return get_config_vars().get(name)
  File "/home/SHARE/SVN/python-trunk/Lib/sysconfig.py", line 402, in get_config_vars
    _init_posix(_CONFIG_VARS)
  File "/home/SHARE/SVN/python-trunk/Lib/sysconfig.py", line 255, in _init_posix
    raise IOError(msg)
IOError: invalid Python installation: unable to open /usr/local/lib/python2.7/config/Makefile (No such file or directory)
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