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


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