It seems PR #210 results in failing pip install even without -e.

The error shows wheel/macosx_libfile.py complains. wheel package is invoked by skbuild. It seems this is difficult to fix (for me), but critical. Until this issue will be fixed someday, I think it is better a little bit to step back.

How about making static link library using cmake, then link it in setup.py without relying on skbuild?

Ping @LecrisUT.