Thanks to forum member dingo35 for identifying a problem with the makedevenv script on Debian Squeeze causing it not to work with bash 4. I have updated the packages to fix the problem, it is available as makedevenv version 7 on the web site.
I have also modified the script to download crosstool's package requirements from the loggytronic web site instead of GNU to speed things up.
Version 8 is now available to fix a problem compiling on 64 bit systems.