#include <simgear/structure/SGReferenced.hxx>
#include <simgear/math/SGMath.hxx>
-class osg::DrawElementsUShort;
+namespace osg
+{
+class DrawElementsUShort;
+}
class SGSkyDome : public SGReferenced {
osg::ref_ptr<osg::MatrixTransform> dome_transform;