Hi 'nviz -q' fails to launch nviz, some windows flash up and disappear straight away. In '/usr/local/src/grass61/grass-6.1.cvs_src_snapshot_2006_06_24/visualization/README' Markus hints that this is to do with the naming of the tkInt.h and tkIntDecls.h But step 3 looses me. Could we have an example of how we should use the 'elif' statement. cheers Dave