docs: def setup_environment():
      """Ensures that the environmental variable RAFCON_LIB_PATH is existent
      """
      try:
          from gi.repository import GLib
          user_data_folder = GLib.get_user_data_dir()
      except ImportError:
          user_data_folder = join(os.path.expanduser("~"), ".local", "share")
      rafcon_root_path = dirname(realpath(rafcon.__file__))
      user_library_folder = join(user_data_folder, "rafcon", "libraries")
  
      # The RAFCON_LIB_PATH points to a path with common RAFCON libraries
      # If the env variable is not set, we have to determine it. In the future, this should always be
      # ~/.local/share/rafcon/libraries, but for backward compatibility, also a relative RAFCON path is supported
      if not os.environ.get('RAFCON_LIB_PATH', None):
          if exists(user_library_folder):
              os.environ['RAFCON_LIB_PATH'] = user_library_folder
          else:
              os.environ['RAFCON_LIB_PATH'] = join(dirname(dirname(rafcon_root_path)), 'share', 'libraries')
  
      # Install dummy _ builtin function in case i18.setup_l10n() is not called
      if sys.version_info >= (3,):
          import builtins as builtins23
      else:
          import __builtin__ as builtins23
      if "_" not in builtins23.__dict__:
          builtins23.__dict__["_"] = lambda s: s