I'm a bit surprised that your qt-include directories are in /opt, but that
should not be a problem.
Could you run the next command:

pkg-config --cflags Qt5Core

My output here is:
-DQT_CORE_LIB -I/usr/include/qt5/QtCore -I/usr/include/qt5
and my include file is located at:
/usr/include/qt5/QtX11Extras/QX11Info

So now the compiler knows how to find that file.

The problem with cmake is that you never know the command line of the compiler,
so you don't have a clue about the include directories it's using.

Cheers
Ton.

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