Nope... Google didn't prove to be a good friend in this case. The first answer is about Qt5.6-windows-beta and the error is slightly different: they seemed to have their MAKEFILE_GENERATOR set to a wrong value, while mine isn't set at all. I have tried all the suggestions, but none of them worked.

I've found somebody else reporting the same problem for this very extension about Qt-WinRT version, but nobody replied to him:
https://visualstudiogallery.msdn.mic...2-e4fa07168408