Comment # 3 on bug 55919 from Roland Egger

And 
make linux-osmesa
build
/lib/libOSMesa.so.7.11.0
./lib/libOSMesa.so.7
./lib/libOSMesa.so
./lib/libGLU.so.1.3.071100
./lib/libGLU.so.1
./lib/libGLU.so

So libGLU is only compiled if I use make linux-osmesa. Is that correct?
I had to remove the -ansi compiler flag because otherwise it has problems 
with c++ comments //