$ virtualenv /tmp/callme_env
New python executable in /tmp/callme_env/bin/python
Installing setuptools, pip...done.
$ . /tmp/callme_env/bin/activate
(callme_env)$ pip install -e git+https://github.com/ceelian/callme.git#egg=callme-master
Obtaining callme-master from git+https://github.com/ceelian/callme.git#egg=callme-master
  Cloning https://github.com/ceelian/callme.git to /tmp/callme_env/src/callme-master
  Running setup.py (path:/tmp/callme_env/src/callme-master/setup.py) egg_info for package callme-master
    Traceback (most recent call last):
      File "<string>", line 17, in <module>
      File "/tmp/callme_env/src/callme-master/setup.py", line 12, in <module>
        import callme
      File "src/callme/__init__.py", line 34, in <module>
        from callme.proxy import Proxy      # noqa
      File "src/callme/proxy.py", line 32, in <module>
        import kombu
    ImportError: No module named kombu
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):

  File "<string>", line 17, in <module>

  File "/tmp/callme_env/src/callme-master/setup.py", line 12, in <module>

    import callme

  File "src/callme/__init__.py", line 34, in <module>

    from callme.proxy import Proxy      # noqa

  File "src/callme/proxy.py", line 32, in <module>

    import kombu

ImportError: No module named kombu