This is part of the Findosg* suite used to find OpenSceneGraph components. Each component is separate and you must opt in to each module. You must also opt into OpenGL and OpenThreads (and Producer if needed) as these modules won't do it for you. This is to allow you control over your own system piece by piece in case you need to opt out of certain components or change the Find behavior for a particular module (perhaps because the default FindOpenGL.cmake module doesn't work with your system as an example). If you want to use a more convenient module that includes everything, use the FindOpenSceneGraph.cmake instead of the Findosg*.cmake modules.
Locate osgQt This module defines
OSGQT_FOUND - Was osgQt found? OSGQT_INCLUDE_DIR - Where to find the headers OSGQT_LIBRARIES - The libraries to link for osgQt (use this)
OSGQT_LIBRARY - The osgQt library OSGQT_LIBRARY_DEBUG - The osgQt debug library
$OSGDIR is an environment variable that would correspond to the ./configure --prefix=$OSGDIR used in building osg.
Created by Eric Wing. Modified to work with osgQt by Robert Osfield, January 2012.