Installation fails on MacOS

[ashwinkumar01]

Running a virtual env on a Mac with python 3.6. Get the same error regardless of easy install, pip or running the setup.py directly.
It first fails to build the wheel for charlockholmes, then it gives me the error message below
error: Setup script exited with error: command 'clang' failed with exit status 1

[jayvdb]

#25 (comment) has some tips.

Also note this package isnt Python 3 compatible yet. c.f. #30