-lXm ---> motif X libraries (only needed by r3.showdspf, which shouldn't be compiled) The GLw... variants are for GL widget library. Again, only for r3.showdspf You do have to have Mesa/OpenGL in order to run NVIZ. But not the Mesa widgets (usually packaged separately). Basically, no worries (except the last item). -- Eric G. Miller <egm2 at jps.net>