[issue31710] setup.py: _ctypes won't get built when system ffi is only in $PREFIX

[Chih-Hsuan Yen]

Chih-Hsuan Yen <yan12125 at gmail.com> added the comment:

Thanks for providing the info. However, I'm sorry as the case is beyond my knowledge. Here's the relevant section in CPython that handles LIBFFI path searching: https://github.com/python/cpython/blob/v3.7.0/setup.py#L1984-L2002. You may want to examine variables there to see if there's something unusual.

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<https://bugs.python.org/issue31710>
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