use forward declaration for QOpenGLWidget and format

BasePlugin/PluginFunctions.hh

@@ -65,11 +65,11 @@
 #ifndef PLUGINFUNCTIONS_HH
 #define PLUGINFUNCTIONS_HH
 
-#include <OpenFlipper/common/Types.hh>
 
 #include <QPair>
 #include <QFileDialog>
 
+#include <OpenFlipper/common/Types.hh>
 #include <OpenFlipper/common/OFGLWidget.hh>
 
 #include <ACG/Scenegraph/SceneGraph.hh>

common/OFGLWidget.hh

@@ -54,8 +54,9 @@
 
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 4, 4))
 
-#include <QOpenGLWidget>
-#include <QSurfaceFormat>
+//only forward declaration
+class QOpenGLWidget;
+class QSurfaceFormat;
 
 typedef QOpenGLWidget OFGLWidget;
 typedef QSurfaceFormat OFGLFormat;