Trouble installing on SGI

Hello,

  I am presently in the process of installing GRASS 4.1 on
a Silicon Graphics Indigo 2 machine. I believed everything was
set up and I tried to run GRASS 4.1 but I ran into some
difficulties. I received two error messages, the first was that
'GISBASE]: not found' and the second was '/etc/GIS.sh: not found'.
I have already defined GISBASE and I checked and /etc/GIS.sh was
present in the directory. If anyone can be of assistance in this
matter please help? Thanks.