#ifdef NONLIN_FRSURF
# if ((defined ALLOW_DEPTH_CONTROL) (defined NONLIN_FRSURF))
# if ((defined NONLIN_FRSURF) (defined ALLOW_DEPTH_CONTROL)) (defined ALLOW_GMREDI)
# if (defined NONLIN_FRSURF) (defined ALLOW_DEPTH_CONTROL)
#if (defined (NONLIN_FRSURF)
# ifdef NONLIN_FRSURF