This question has come up lot. A quick search for rgb.txt in past messages in this mailing list shows this answer:

From: Richard vaughan <vaughan@cs.sfu.ca>
Date: March 3, 2007 10:20:00 AM PST
To: playerstage-users@lists.sourceforge.net
Subject: Re: [Playerstage-users] Error running Stage and Gazebo
Reply-To: playerstage-users@lists.sourceforge.net


The Stage problem is because of the new file layout of X.org compared  
to XFree86. This problem will be fixed in future releases. The  
workaround for now is to find your copy of rgb.txt (on Linux the  
easiest way is to do this:

$ locate rgb.txt

And create a symbolic link to it in the place Stage is looking:

$ sudo ln -s <complete path to your rgb.txt> usr/X11R6/lib/X11/rgb.txt

And you should be back in business.

and this one:

On Oct 5, 2006, at 2:56 PM, Carlos wrote:


Thanx brian,

I recompiled with --with-color=/usr/share/X11 and stage works.  The
problem now is that the stage is all RED and I get the following
warnings:


Ah, you need to give the full path to the file, e.g.
   $ ./configure --with-color=/usr/share/X11/rgb.txt

brian.



On 30-Jun-07, at 8:13 AM, wdbarnwell wrote:


I got stage to work. Heres how for anyone with Sabayon Linux that is having
problems. I located rgb.txt in /usr/share/X11 and use the cp command like
this   cp  /usr/share/X11/rgb.txt /usr/X11R6/lib/X11  I couldn't   
get the symbolic links to work so I tried copying and that works. Thanks for
everyone's help.  


author="Toby Collett-3">
Detect the most common two or three locations at configure time and if 
we dont find it fall back on a distributed copy? Does it ever change? I 
dont think their would be an issue with just installing one with stage 
if that is the easiest, its not a large file (20k).

A quick locate rgb.txt shows I already have 5 of these on my system 
(ubuntu feisty) and only one of them differs from the others 
(distributed with latex2html)

Toby

Richard vaughan wrote:
What's the best total solution for this, folks? Should we distribute  
a copy of rgb.txt and install it with libstage?

Richard/

On 29-Jun-07, at 4:50 PM, Toby Collett wrote:


There have been a lot of issues with different distributions having
rgb.txt in different places, try a "locate rgb.txt" and it will  
show you
where it is on your distribution, you may need to symlink it to one of
the expected places.

Toby

kas wrote:

I don't know why you dont have the rgb.txt file. Well I am  
uploading my
rgb.txt file. Put this file in "/usr/X11R6/lib/X11". Make sure you  
rebuild
stage (no need to do anything to player) Goodluck



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