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From: sfeam <sfeam@users.sourceforge.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: png terminal not working, 'help' saying "Permission denied"
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Date: Thu, 23 Aug 2012 14:15:10 -0700
Organization: gnuplot development team
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Abigail wrote:

> Hello,
> 
> I have gnuplot version 4.6 and am running it on Mac OS X 10.6.8. I want to
> output my file as a png (set output 'myplot.png';), but it is not listed
> as a possible terminal when I type "set terminal". 

The set of supported terminals is determined at the time gnuplot is built.
You cannot add or remove support afterwards.
From your description, it seems that neither png nor pngcairo support was
configured into your gnuplot executable when it was built.

> I have installed cairo and pango with macports (with the flags
> +no_x11 +quartz +universal) but somehow gnuplot doesn't see them? It is
> very frustrating. I remember having some issues when I was installing
> gnuplot, but I eventually just let fink do the heavy lifting.

See above. The various support libraries must be already installed at the
time gnuplot is built.  Adding them later won't help.

> I have tried doing it as a postscript (.eps) but my computer then cannot 
> open the file afterward  (even sudoing it open doesn't work, because 
> apparently there's nothing in the .eps file).

That is some totally different problem.  Several possible causes:
1) The PostScript header files were not installed on your system, or were
installed some place other than where gnuplot is looking for them.
2) The headers are OK, but you didn't close the output file ("unset out")
in gnuplot before trying to view it. 

> Also, when I type 'help' in gnuplot I get "Permission denied." 

No idea.  I haven't encountered that one before.

> 
> Your insight is much appreciated!
> 
> Thank you,
> Abigail