Task is to provide a shell script such that a windows executable can be generated by executing this shell script under debian . The required packages to be installed must be from trustworthy and well maintained sources (such as the debian repository itself). Apart from installing necessary libs, the cross-compile must work without root.
There is an old version of a cross-compile howto  but I don't get that translated to new libs and scons.
Globulation 2 uses scons to build. It is open source so feel free to check for details there.
Point of this project is to integrate windows binary generation in a hudson continous integration system for nightly builds. Subsequent projects will include cross-compiling to mac, 64bit, other linux plattforms ...
$ cat /proc/version
Linux version 2.6.11-1-686 (dannf@firetheft) (gcc version 3.3.6 (Debian 1:3.3.6-6)) #1 Mon Jun 20 22:00:38 MDT 2005
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I can try to help you make it more simple way, but good to see examples of objects, libraries, or source code, which you are currently using to be sure, and a good answer