diff --git a/wrap/gui/trackball.cpp b/wrap/gui/trackball.cpp
index 1dd6ec2c..aba34cff 100644
--- a/wrap/gui/trackball.cpp
+++ b/wrap/gui/trackball.cpp
@@ -21,7 +21,12 @@
 *                                                                           *
 ****************************************************************************/
 
+#ifdef QT_OPENGL_LIB
+#include <QtOpenGL/qgl.h> 
+#else
 #include <GL/glew.h>
+#endif
+
 #include "trackball.h"
 #include<set>
 
diff --git a/wrap/gui/trackmode.cpp b/wrap/gui/trackmode.cpp
index f8157f62..7365c764 100644
--- a/wrap/gui/trackmode.cpp
+++ b/wrap/gui/trackmode.cpp
@@ -21,7 +21,12 @@
 *                                                                           *
 ****************************************************************************/
 
+#ifdef QT_OPENGL_LIB
+#include <QtOpenGL/qgl.h> 
+#else
 #include <GL/glew.h>
+#endif
+
 #include <vcg/space/distance3.h>
 #include <wrap/gui/trackmode.h>
 #include <wrap/gui/trackball.h>