[issue31652] make install fails: no module _ctypes

[Bryan]

Bryan <bryan.fogleman at gmail.com> added the comment:

Similar error on CentOS 7

ModuleNotFoundError: No module named '_ctypes'
 
Install --  yum install libffi-devel

Repeat:
./configure --enable-optimizations
make altinstall

Results:
Collecting setuptools
Collecting pip
Installing collected packages: setuptools, pip
Successfully installed pip-10.0.1 setuptools-39.0.1

NOTE: 
The error did not stop python3.7 from operating as noted on this page. 

# python3.7
Python 3.7.0 (default, Jul 16 2018, 11:25:12)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-28)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> print ("Hello Python")
Hello Python
>>>

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nosy: +bryanf

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<https://bugs.python.org/issue31652>
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