/usr/bin/pip run on Fri Sep 16 18:26:26 2016
Downloading/unpacking greenlet-dev
  Getting page https://pypi.python.org/simple/greenlet--dev/
  Could not fetch URL https://pypi.python.org/simple/greenlet--dev/: 404 Client Error: Not Found
  Will skip URL https://pypi.python.org/simple/greenlet--dev/ when looking for download links for greenlet-dev
  Getting page https://pypi.python.org/simple/
  URLs to search for versions for greenlet-dev:
  * https://pypi.python.org/simple/greenlet--dev/
  Getting page https://pypi.python.org/simple/greenlet--dev/
  Could not fetch URL https://pypi.python.org/simple/greenlet--dev/: 404 Client Error: Not Found
  Will skip URL https://pypi.python.org/simple/greenlet--dev/ when looking for download links for greenlet-dev
  Could not find any downloads that satisfy the requirement greenlet-dev
Cleaning up...
No distributions at all found for greenlet-dev
Exception information:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 290, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1178, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 277, in find_requirement
    raise DistributionNotFound('No distributions at all found for %s' % req)
DistributionNotFound: No distributions at all found for greenlet-dev