code: def activate(specifier):
      
      try:
          for distro in require(specifier):
              distro.activate()
      except (VersionConflict, DistributionNotFound):
          raise RuntimeError('The installed version of pip is too old; peep '
                             'requires ' + specifier)
docs: Make a compatible version of pip importable. Raise a RuntimeError if we
      couldn't.