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Collecting libnacl<1.4,>=1.3.6 (from pymacaroons)
  Downloading libnacl-1.3.6.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "/tmp/pip-build-scanzqss/libnacl/libnacl/__init__.py", line 62, in _get_nacl
        return ctypes.cdll.LoadLibrary('tweetnacl.so')
      File "/usr/lib/python3.4/ctypes/__init__.py", line 429, in LoadLibrary
        return self._dlltype(name)
      File "/usr/lib/python3.4/ctypes/__init__.py", line 351, in __init__
        self._handle = _dlopen(self._name, mode)
    OSError: tweetnacl.so: cannot open shared object file: No such file or directory
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "<string>", line 20, in <module>
      File "/tmp/pip-build-scanzqss/libnacl/setup.py", line 7, in <module>
        from libnacl.version import __version__
      File "/tmp/pip-build-scanzqss/libnacl/libnacl/__init__.py", line 70, in <module>
        nacl = _get_nacl()
      File "/tmp/pip-build-scanzqss/libnacl/libnacl/__init__.py", line 68, in _get_nacl
        raise OSError(msg)
    OSError: Could not locate nacl lib, searched for libsodium.so, libsodium.so.13, libsodium.so.10, libsodium.so.5, libsodium.so.4,  and tweetnacl.so