The new versions of osgcal and osgal which work with OSG 2 libraries need pkgconfig support added to OpenSceneGraph-devel. New pkgconfig files have been added to the OSG SVN repo here: http://www.openscenegraph.org/projects/osg/browser/OpenSceneGraph/trunk/packaging/pkg_config
Upstreams *.pc applied. FYI: These are broken and messy. I do not recommend to use them.