Traceback (most recent call last):
  File "/home/tone/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.0/mozjs/js/src/../../configure.py", line 127, in <module>
    sys.exit(main(sys.argv))
  File "/home/tone/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.0/mozjs/js/src/../../configure.py", line 34, in main
    return config_status(config)
  File "/home/tone/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.0/mozjs/js/src/../../configure.py", line 122, in config_status
    return config_status(args=[], **encode(sanitized_config, encoding))
  File "/home/tone/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.0/mozjs/python/mozbuild/mozbuild/config_status.py", line 133, in config_status
    reader = BuildReader(env)
  File "/home/tone/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.0/mozjs/python/mozbuild/mozbuild/frontend/reader.py", line 868, in __init__
    self._gyp_worker_pool = ProcessPoolExecutor(max_workers=max_workers)
  File "/home/tone/.cargo/registry/src/github.com-1ecc6299db9ec823/mozjs_sys-0.61.0/mozjs/third_party/python/futures/concurrent/futures/process.py", line 285, in __init__
    EXTRA_QUEUED_CALLS)
  File "/usr/lib/python2.7/multiprocessing/__init__.py", line 218, in Queue
    return Queue(maxsize)
  File "/usr/lib/python2.7/multiprocessing/queues.py", line 63, in __init__
    self._rlock = Lock()
  File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 147, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1)
  File "/usr/lib/python2.7/multiprocessing/synchronize.py", line 75, in __init__
    sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue)