[Gnuplot-info] "textcolor" command not working in script

[babelproofreader <bab...@gm...>]

I have recently changed my operating system from Ubuntu 11.04 to Kubuntu
10.04 LTS. On both systems I installed Gnuplot from the Synaptic package
manager but now I find that scripts that worked on Ubuntu now fail on
Kubuntu. Specifically the line that fails is 

set key bottom left horizontal spacing 0.5 width -1 samplen 1 textcolor rgb
"#FFFFFF"

with the error message

undefined variable: textcolor

I am now running Gnuplot Version 4.2 patchlevel 6 on an AMD64 machine, Linux
2.6.32-34-generic. Can anyone suggest what the problem is? Is it that I have
reverted to an older system/Synaptic version of Gnuplot on which the
"textcolor" command is not supported? If this is the case, I presume I will
have to manually compile the most recent version of Gnuplot, or is there a
simple rewrite of the script that will do the job?
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