File opencv-gles.patch of Package opencv

diff --git a/modules/highgui/src/window_QT.cpp b/modules/highgui/src/window_QT.cpp
index 9425c7b..9e3c156 100644
--- a/modules/highgui/src/window_QT.cpp
+++ b/modules/highgui/src/window_QT.cpp
@@ -3225,7 +3225,9 @@ void OpenGlViewPort::updateGl()
 
 void OpenGlViewPort::initializeGL()
 {
+#ifdef GL_PERSPECTIVE_CORRECTION_HINT
     glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
+#endif
 }
 
 void OpenGlViewPort::resizeGL(int w, int h)