osgviewer.cc: In constructor ‘omnetpp::qtenv::OsgViewer::OsgViewer(QWidget*)’:
osgviewer.cc:319:31: error: ‘getWindowingSystemInterfaces’ is not a member of ‘osg::GraphicsContext’
         osg::GraphicsContext::getWindowingSystemInterfaces()->addWindowingSystemInterface(WindowingSystemInterface::getInterface());