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specific code. As a result of this, HAVE_GTK3 no longer needs to be exposed. The use of HAVE_GTK, and HAVE_ GTK3 have been changed to mirror the method used by HAVE_QT and HAVE_QT5. On branch gtk3 Changes to be committed: modified: CMakeLists.txt modified: cmake/OpenCVFindLibsGUI.cmake modified: cmake/templates/cvconfig.h.in modified: modules/highgui/src/window.cpp modified: modules/highgui/src/window_gtk.cpp