Comment 0 for bug 1468808

I'm running Ubuntu 14.04.

$ pip list | grep -E "(pip|pbr|setuptools)"
pbr (1.2.0)
pip (7.0.3)
setuptools (18.0)

$ ./stack.sh
...
Collecting pbr!=0.7,<1.0,>=0.6 (from keystonemiddleware>=1.5.0)
  Using cached pbr-0.11.0-py2.py3-none-any.whl
...
Installing collected packages: pbr
  Found existing installation: pbr 1.2.0
    Uninstalling pbr-1.2.0:
      Successfully uninstalled pbr-1.2.0
Successfully installed pbr-0.11.0
...

$ pip list | grep -E "(pip|pbr|setuptools)"
pbr (0.11.0)
pip (7.0.3)
setuptools (18.0.1)

Downgrading pbr to 0.11.0 leads to the following well-known error:
    Complete output from command python setup.py egg_info:
    error in setup command: 'tests_require' must be a string or list of strings containing valid project/version requirement specifiers; Expected ',' or end-of-list in python-ldap>=2.4;python_version=='2.7' at ;python_version=='2.7'