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Even though I cannot fully understand your remarks, it
appears that you are suggesting a solution. Can you perhaps
produce a patch that fixes the problem?

I am still uncertain what the bug in Python here is. In line
633, there is no function call, as far as I can see
(although CWERASE might expand to a function call); so it
seems more likely that this is a bug in CC or in the system
header files, not in Python.

As a work-around, just try compiling --without-cxx.