In particular, this message is common and does not indicate that anything is wrong: If the program is working and you see the graphics you expect, ignore these messages. Note that X11 spews forth error messages constantly. If $DISPLAY is blank, then something has gone wrong with one of the steps (did you remember to capitalize -XY?). If $DISPLAY has a value (typically of the form localhost:NN:N) then the X11 connection has been forwarded correctly. To check this, on the remote system examine the value of the variable $DISPLAY: If you try to run a program and you don't see the graphics display you expected, or you get messages of the form Can't open display, then it probably means that you did not forward your X11 connection as described in the following steps. If you're logging into one of the Nevis systems with your own computer (laptop or desktop) using a plain-text Terminal program, you will almost certainly need X11 to run applications such as ROOT.
X11 is the graphics display protocol used by UNIX systems.
Setting up X11 and OpenGL on your laptop/desktop
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