Building JOGL2 for FreeBSD

I am unable to find this PFNGLXGETREFRESHRATESGIPROC. I can’t grep it in <GL/*> . On the web this typedef is in glxew - but a very old version. I suspect freebsd has outdated headers. Anybody know where I can get header files appropriate for jogl2 (or if this is truly my problem at all)?

Regards,

Monty