code: def make_environment_relocatable(home_dir):
      
      activate_this = os.path.join(home_dir, 'bin', 'activate_this.py')
      if not os.path.exists(activate_this):
          logger.fatal(
              'The environment doesn\'t have a file %s -- please re-run virtualenv '
              'on this environment to update it' % activate_this)
      fixup_scripts(home_dir)
      fixup_pth_and_egg_link(home_dir)
docs: Makes the already-existing environment use relative paths, and takes out
      the #!-based environment selection in scripts.