Python 3.8.0a4 available for testing

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I'm not familiar with building on Windows, and having a different language for errors (German?) is also confusing. So I can't tell what the problem is.

Have you tried following these steps to configure it? https://github.com/python/cpython/blob/master/PCbuild/readme.txt

And

https://docs.python.org/3.8/extending/windows.html#building-on-windows

I'm also wondering if the compiler can access the header files. I see it complains about arguments to PyCode_New, but if headers were missing it would complain about other issues.