Analyzing links from page https://pypi.python.org/simple/Mercurial/
  Could not find any downloads that satisfy the requirement Mercurial>=2.5.3 (from -r etc/requirements/noc.txt (line 1))

No distributions at all found for Mercurial>=2.5.3 (from -r etc/requirements/noc.txt (line 1))

Exception information:
Traceback (most recent call last):
  File "/opt/noc/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/basecommand.py", line 104, in main
    status = self.run(options, args)
  File "/opt/noc/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/commands/install.py", line 245, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/opt/noc/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/req.py", line 978, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/opt/noc/lib/python2.7/site-packages/pip-1.1-py2.7.egg/pip/index.py", line 157, in find_requirement
    raise DistributionNotFound('No distributions at all found for %s' % req)
DistributionNotFound: No distributions at all found for Mercurial>=2.5.3 (from -r etc/requirements/noc.txt (line 1))