old_contents: 
  import setuptools
  
  # In python < 2.7.4, a lazy loading of package `pbr` will break
  # setuptools if some other modules registered functions in `atexit`.
  # solution from: http://bugs.python.org/issue15881#msg170215
  try:
      import multiprocessing  # noqa
  except ImportError:
      pass
  
  setuptools.setup(
      setup_requires=['pbr'],
      pbr=True,
      dependency_links=[
          'https://github.com/michaelkuty/pbr/tarball/master#egg=pbr'])
  
new_contents: 
  import setuptools
  
  # In python < 2.7.4, a lazy loading of package `pbr` will break
  # setuptools if some other modules registered functions in `atexit`.
  # solution from: http://bugs.python.org/issue15881#msg170215
  try:
      import multiprocessing  # noqa
  except ImportError:
      pass
  
  setuptools.setup(
      setup_requires=['pbr>=0.11,<2.0'],
      pbr=True,
      dependency_links=[
          'https://github.com/michaelkuty/pbr/tarball/master#egg=pbr'])
  
subject: fix pbr dependency