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 include/qwt3d_openglhelper.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/include/qwt3d_openglhelper.h b/include/qwt3d_openglhelper.h
index e5499c2..a7ecddc 100644
--- a/include/qwt3d_openglhelper.h
+++ b/include/qwt3d_openglhelper.h
@@ -8,6 +8,11 @@
 #include <QtOpenGL/qgl.h>
 #endif
 
+#if QT_VERSION < 0x047999
+#include <GL/glu.h>
+#endif
+
+
 namespace Qwt3D
 {