bzr fails to install in Python 2.7:
bzr fails to install in Python 2.7:

Collecting bzr==2.6.0
  Downloading bzr-2.6.0.tar.gz (11.3 MB)
    ERROR: Command errored out with exit status 1:
    Complete output (5 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-vVfVj5/bzr/setup.py", line 205, in <module>
        pyrex_version_info = tuple(map(int, pyrex_version.rstrip("+").split('.')))
    ValueError: invalid literal for int() with base 10: '0a5'
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

zatosource/zato-build,zatosource/zato-build