File "src/sage/game_theory/catalog_normal_form_games.py", line 916, in sage.game_theory.catalog_normal_form_games.TravellersDilemma
Failed example:
    g.obtain_nash()
Exception raised:
    Traceback (most recent call last):
      File "/Users/kwankyu/GitHub/sage-dev/src/sage/doctest/forker.py", line 695, in _run
        self.compile_and_execute(example, compiler, test.globs)
      File "/Users/kwankyu/GitHub/sage-dev/src/sage/doctest/forker.py", line 1093, in compile_and_execute
        exec(compiled, globs)
      File "<doctest sage.game_theory.catalog_normal_form_games.TravellersDilemma[8]>", line 1, in <module>
        g.obtain_nash()
      File "/Users/kwankyu/GitHub/sage-dev/src/sage/game_theory/normal_form_game.py", line 1688, in obtain_nash
        return self._solve_lrs(maximization)
      File "/Users/kwankyu/GitHub/sage-dev/src/sage/game_theory/normal_form_game.py", line 1758, in _solve_lrs
        LrsNash().require()
      File "/Users/kwankyu/GitHub/sage-dev/src/sage/features/__init__.py", line 209, in require
        raise FeatureNotPresentError(self, presence.reason, presence.resolution)
    sage.features.FeatureNotPresentError: lrsnash is not available.
    Executable 'lrsnash' not found on PATH.
    No equivalent system packages for homebrew are known to Sage.
    To install lrsnash using the Sage package manager, you can try to run:
      !sage -i lrslib
    No equivalent system packages for pip are known to Sage.
    Further installation instructions might be available at http://cgm.cs.mcgill.ca/~avis/C/lrs.html.