changed extensions from .c to .cpp and got compiling as C files as part of the osg core library.
Updated and cleaned up the rest of the OSG to use the new internal GLU.
with gcc (version 4.3.1) I got the following error message in
include/osgUtil/TriStripVisitor and Tessellator
error: type qualifiers ignored on function return type
The errors belong all to a INLINE function definition. Find attached my
modified version."