[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:

A possible case might be that pkg-config on your build machine is not properly configured. Could you check the value of LIBFFI_INCLUDEDIR in config.log? It shuold either be an empty string or /root/rc3/dist/lib/libffi-3.2.1/include.

As a reference, the following command is used to compute LIBFFI_INCLUDEDIR: https://github.com/python/cpython/blob/v3.7.0/configure.ac#L2936

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