Here's what I did in a chrooted Stable while writing up a reply for this post:  http://forums.debian.net/viewtopic.php?f=10&t=90444 ...

Update: because I had copied and pasted some of the instructions from one of my earlier attempts at building gimp under stable, there were ...

The symptom: Gnuplot 4.4.0-1.1 (the current Debian version)  can't handle numbers smaller than 10**(-9) properly e.g. me@beryllium:...