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

[Chi Hsuan Yen]

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

> even if cflags/ldflags are ok 

Might be this. setup.py doesn't use -I flags in $CFLAGS. It looks into $CPPFLAGS only.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31710>
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