[Makefile] Fix "combine user with prefix ... error" for Homebrew Python (close #831) - https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Homebrew-and-Python.md#note-on-pip-install---user - http://bugs.python.org/issue22269
[Makefile] Fix "combine user with prefix ... error" for Homebrew Python (close #831)
- https://github.com/Homebrew/homebrew/blob/master/share/doc/homebrew/Homebrew-and-Python.md#note-on-pip-install---user
- http://bugs.python.org/issue22269

Workaround:
- http://stackoverflow.com/a/4495175

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