Change for Python 1.6 compatibility - UNIX's 'os' module defines 'spawnv' now, so we check for 'fork' first.
Change for Python 1.6 compatibility - UNIX's 'os' module defines
'spawnv' now, so we check for 'fork' first.

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