When testing the builds when PGO is enabled, or by simply running rt.bat, the following error is (always) issued:

cpython\include\Python.h(8): fatal error C1083: Cannot include: 'pyconfig.h': No such file or directory

One example of steps taken is:

git clone git@github.com:python/cpython.git
cd cpython
git checkout 3.6
PCBuild\get_externals.bat
Tools\msi\get_externals.bat
PCBuild\build.bat -p x64


I have to manually copy a pyconfig.h file from a working Python's include directory to the repositorie's include directory to fix this error. By the way, I had PYTHONHOME environment variable pointing to 

...\Python36\DLLs; ...\Python36\Lib; ...\Python36\Lib\site-packages; ...\Python36\include

with no success.