From Ulrich Hertlein, fixed build problem due to cmake_policy CMP0017 being only available from cmake-2.8.4, added guard to prevent build problems
From Ulrich Hertlein, fixed build problem due to cmake_policy CMP0017 being only available from cmake-2.8.4, added guard to prevent build problems


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