root@box:~# gunicorn --worker-class=gevent --bind=127.0.0.1:8000 --workers=2 --timeout=600 --name=webinterface --chdir=/opt/enigmabox/webinterface wsgi

Error: class uri 'gevent' invalid or not found: 

[Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/gunicorn/util.py", line 139, in load_class
    mod = import_module('.'.join(components))
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/usr/lib/python2.7/site-packages/gunicorn/workers/ggevent.py", line 24, in <module>
    from gevent.server import StreamServer
  File "/usr/lib/python2.7/site-packages/gevent/server.py", line 6, in <module>
    from gevent.socket import EWOULDBLOCK, socket
  File "/usr/lib/python2.7/site-packages/gevent/socket.py", line 659, in <module>
    from gevent.ssl import sslwrap_simple as ssl, SSLError as sslerror, SSLSocket as SSLType
  File "/usr/lib/python2.7/site-packages/gevent/ssl.py", line 386, in <module>
    def get_server_certificate(addr, ssl_version=PROTOCOL_SSLv3, ca_certs=None):
NameError: name 'PROTOCOL_SSLv3' is not defined
]