From David Callu, compile fix for gcc 4.1
From David Callu, compile fix for gcc 4.1


artoolkit/osg,marchelbling/osg,openscenegraph/osg,openscenegraph/osg,openscenegraph/osg,artoolkit/osg,jtorresfabra/osg,scrawl/osg,marchelbling/osg,jtorresfabra/osg,marchelbling/osg,tomasthoresen/osg,scrawl/osg,artoolkit/osg,tomasthoresen/osg,scrawl/osg,jtorresfabra/osg,marchelbling/osg,artoolkit/osg,scrawl/osg,tomasthoresen/osg,openscenegraph/osg,tomasthoresen/osg,jtorresfabra/osg