Zdenek Dohnal wrote:

> our Fedora python team is doing checks of packages which requires python 
> about their issues with new python version - 3.9.
> 
> They found out Vim fails to build from source with python3.9 due following 
> error:
> 
> if_python3.c: In function 'py3__Py_DECREF':
> if_python3.c:606:5: error: '_Py_DEC_REFTOTAL' undeclared (first use in this 
> function); did you mean '_Py_DECREF'?
>   606 |     _Py_DEC_REFTOTAL;
>       |     ^~~~~~~~~~~~~~~~
>       |     _Py_DECREF
> if_python3.c:606:5: note: each undeclared identifier is reported only once 
> for each function it appears in
> 
> _Py_DEC_REFTOTAL macro is no longer available in python3.9 - Python project 
> uses variable decrementing directly now '_Py_RefTotal--;'
> 
> Actually, I'm not quite sure Vim defines py3__Py_DECREF function in its 
> python module, when it does the same thing as _Py_DECREF defined in python 
> library.

Looks like it was only defined for debugging.  I think we can just drop
that line.

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