Issue #18441: add Mac (darwin) gui check. This is not needed today, but has been in the past and might be needed again in the future
Issue #18441: add Mac (darwin) gui check. This is not needed today, but has been
in the past and might be needed again in the future

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator