Install Fails on OS X

[cancan101]

On OS X 10.11 with python 2.7.12:

$ pip install opencv-python
Collecting opencv-python
  Could not find a version that satisfies the requirement opencv-python (from versions: )
No matching distribution found for opencv-python

If I try to explicitly install the wheel, I get:

opencv_python-3.1.0.3-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl is not a supported wheel on this platform.

[cancan101]

Looks like this was caused by python being built with ucs4 support.