Dronekit-sitl on a Mac, not working?

[ClaudeDufour66]

As per instructions I believe I have properly installed on my Mac ...dronekit (2.9.1)
dronekit-sitl (3.2.0), ... MAVProxy (1.6.2), pip (9.0.1), .... The aforementioned versions were displayed when I typed in "pip list" at the command prompt. When I typed in "dronekit-sitl --list" I got the following message "File "/usr/local/bin/dronekit-sitl", line 5, in
from pkg_resources import load_entry_point
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in
working_set.require(requires)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require
needed = self.resolve(parse_requirements(requirements))
File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
raise DistributionNotFound(req) # XXX put more info here
pkg_resources.DistributionNotFound: six>=1.10".

Any thoughts, thank you?