today I've been playing with Mountain Lion and I tried to compile a fortran application that uses f90gl 

I'm facing a challenge now / I realize that Xquartz is built against freeglut which does not seem to support

fortran 90 extensions. In the X11 application that is distributed with Lion, I can see /usr/X11/include/GL/glutf90.h

but not with Mountain Lion and Xquartz. Any suggestion ? I could try to build an original version of glut-3.7.1

but xmkmf is required and not available since Snow Leopard.

Regards,

PO