From Bob Kuehne, more general checks for existance of extensions.
From Bob Kuehne, more general checks for existance of extensions.


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