OPTIONAL BACKEND EXTENSIONS
      0 [main] python2.7 27276 child_info_fork::abort: address space needed by 'cygEGL-1.dll' (0x7F0000) is already occupied
Traceback (most recent call last):
  File "setup.py", line 271, in <module>
    result = package.check()
  File "/usr/src/matplotlib-1.5.0/setupext.py", line 520, in check
    additional_info = self.check_requirements()
  File "/usr/src/matplotlib-1.5.0/setupext.py", line 1608, in check_requirements
    ext = self.get_extension()
  File "/usr/src/matplotlib-1.5.0/setupext.py", line 1629, in get_extension
    self.add_flags(ext)
  File "/usr/src/matplotlib-1.5.0/setupext.py", line 1690, in add_flags
    pkg_config.setup_extension(ext, 'pygtk-2.0')
  File "/usr/src/matplotlib-1.5.0/setupext.py", line 306, in setup_extension
    stderr=subprocess.STDOUT)
  File "/usr/lib/python2.7/subprocess.py", line 566, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1231, in _execute_child
    self.pid = os.fork()
OSError: [Errno 11] Resource temporarily unavailable