Did you remove build directory before running cmake? Clean up build directory (delete it and create new empty) and then set Qt5_DIR according to this Build Error PythonQt Visual Studio 2015 Qt 5.9.2.
Did you remove build directory before running cmake? Clean up build directory (delete it and create new empty) and then set Qt5_DIR according to this Build Error PythonQt Visual Studio 2015 Qt 5.9.2.