From Stephan Huber, build fix for OSX XCode build
From Stephan Huber, build fix for OSX XCode build


omega-hub/osg,koshman86/osg,omega-hub/osg,artoolkit/osg,XiaoCC/osg,artoolkit/osg,XiaoCC/osg,stmh/osg,stmh/osg,stmh/osg,koshman86/osg,ghub/osg,ghub/osg,ntoand/osg,omega-hub/osg,ntoand/osg,stmh/osg,artoolkit/osg,koshman86/osg,XiaoCC/osg,artoolkit/osg,stmh/osg,XiaoCC/osg,ntoand/osg,XiaoCC/osg,ntoand/osg,ghub/osg,ghub/osg,koshman86/osg,omega-hub/osg