Graph_set can't open

[Grass package]

> Graph_Set: can't open 
> Please start graphics monitor <x0>.
> Error - Graphics monitor <x0> not running!
> Problem selecting x0. Will try once more
> Please start graphics monitor <x0>.
> Error - Graphics monitor <x0> not running!

This error message occurs when there is no DISPLAY variable set to point 
to your current display (screen). You need to type:

	export DISPLAY=IP.number.of.your.terminal:0

The :0 indicates that you want any graphics produced by grass to be sent
to the main screen of your terminal. IE if your terminal has more than
one graphics screen, you'll need to specify some other number.

Martijn van Leusen