Alexey Izbyshev <izbys...@ispras.ru> added the comment:

The in-tree copy of libffi was removed in #27979 (between 3.6 and 3.7) for all 
platforms except Windows and macOS. Therefore, you need libffi development 
package installed in your system to build CPython 3.7. 

As for PIP, personally, I think that's an overkill to require ctypes, 
especially at CPython build time. If you don't want to build ctypes, I believe 
you may use '--without-ensurepip' configure option as a workaround.

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nosy: +izbyshev, zach.ware

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