Properly check for Python: check that there is a python executable of the correct version, and check that the Python.h include file exists. If there was a --with-python command line argument but Python was not found, complain loudly, otherwise just continue without Python.
Properly check for Python: check that there is a python executable of
the correct version, and check that the Python.h include file exists.
If there was a --with-python command line argument but Python was not
found, complain loudly, otherwise just continue without Python.

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