Odd error (gnuplot_x11) when running gnuplot 4.0 on Mandriva 2006

[Ethan A M. <merritt@u.washington.edu>]

I keep binaries of gnuplot 3.7 and 4.0 around for testing
backward compatibilities.  Up until now I haven't had any
problem with them, other than making sure that I have copies
of the relevant older shared libraries as well.

However, I recently upgraded my linux systems to Mandriva 2006.
Now I am getting very strange error messages from 4.0

gnuplot> set term x11 font "arial"
Terminal type set to 'x11'
Options are '0 font "arial"'
gnuplot> plot x
gnuplot> *** glibc detected *** free(): invalid pointer: 0xb7f9561c ***

This seems to be coming from gnuplot_x11, which immediately dies.
Yes, it's the 4.0 version of gnuplot_x11.

The same binary runs fine if I boot into the previous version
of the operating system.

-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742