@SGaist yes, you were right! Qmake is saving absolute path internally, I think. So I moved all necessary files to required directory and everything is working, thank you!
I'll post a screenshot with minimum necessary files and directories that needed to successful qmake's work without Qt.
0_1506369827244_Screenshot_20170925_230317.png
It requires an empty include directory! If you delete it QtCreator will not show your non-Qt Kit in the startup list of Kits for a new project!