Unfortunately MacOS versions of Python do not ship with the
equivalent of python3.dll found on Windows. This implies we
can only compile our binaries against a specific version of Python. We
will use the default Python binary for that, which is installed in
/Library/Frameworks/Python.framework/
The Macports version is also linked against an explicit version of Python, in this case provided by Macports.
The Python package janus_swi may be compiled against any
version of Python selected by pip. See section
9 for details.