"errors" when running plot

[Francesco Potorti`]

>One thing is that if you are running a server, superfluous messages like about 
>X11 not being set can really [...]

I don't fully understand if this is really the same issue, but I have an
instance of Octave running in a CGI and creating a PNG plot.  Even if I
start the plotting commands with

   figure("visible","off")

I get 

   warning: X11 DISPLAY environment variable not set

in Apache's error log for each invocation of the CGI script.  This
happens even with Octave 3.2 rc4.

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