Zachary Ware <zachary.w...@gmail.com> added the comment:

I expect that the root cause is missing libffi(-dev[el]) on your system, 
preventing _ctypes from building, so your quick fix would be to install that 
and try again.

However, not having _ctypes shouldn't cause installation to fail.  Donald, is 
ctypes a hard requirement for pip to install itself?  If so, ensurepip as 
called by `make install` should either gracefully handle a lack of ctypes or be 
disabled when ctypes is not available.

----------
nosy: +dstufft, ncoghlan, zach.ware

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