/usr/lib/x86_64-linux-gnu/qt5/ is in qt3d5-dev 5.9.5+dfsg-0ubuntu2.
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/usr/lib/x86_64-linux-gnu/qt5/mkspecs/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3danimation.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dcore.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dextras.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dinput.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dlogic.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dquick.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dquickanimation.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dquickextras.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dquickinput.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dquickrender.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3dquickscene2d.pri
/usr/lib/x86_64-linux-gnu/qt5/mkspecs/modules/qt_lib_3drender.pri