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Io failed to build on OSX because cmake was automatically selecting the newest version of python for its library. The problem with this is that python 3 uses different object types/functions and it would cause IoPython to fail, causing the entire io build to fail, due to implicit declarations. Now it uses python 3.3+ as a default and will build properly on OSX.
EDIT:
As a side note:
ints have become longs
strs have become unicode
See: https://docs.python.org/3/howto/cporting.html