highgui: Compilation error with Qt5 due to #ifdef Q_WS_X11 guard #6471
Description
I get the following compilation error when building against Qt5:
/var/tmp/paludis/build/media-libs-opencv-3.1.0-r2/work/opencv-3.1.0/modules/highgui/src/window_QT.cpp: In member function 'virtual void OpenGlViewPort::initializeGL()':
/var/tmp/paludis/build/media-libs-opencv-3.1.0-r2/work/opencv-3.1.0/modules/highgui/src/window_QT.cpp:3168:12: error: 'GL_PERSPECTIVE_CORRECTION_HINT' was not declared in this scope
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
^
modules/highgui/CMakeFiles/opencv_highgui.dir/build.make:104: recipe for target 'modules/highgui/CMakeFiles/opencv_highgui.dir/src/window_QT.cpp.o' failed
This is caused by the #ifdef Q_WS_X11 guard around the #include <GL/glx.h> which is no longer defined by Qt5. Qt5 now defines Q_OS_* constants.
I would provide a fix, but I'm not certain whether to use Q_OS_UNIX or Q_OS_LINUX here
Full build log:
1461600198-install-media-libs_opencv-3.1.0-r2:0::media.out.txt