Building Kernel Modules With Module-Assistant On Debian Lenny
module-assistant is a tool for building Debian kernel modules from source, without having to rebuild the whole kernel. It fetches module-source packages that have been prepared for the Debian distribution via apt and produces .deb packages. More here
This tutorial shows how to use module-assistant in command-line mode and in interactive mode.
I do not issue any guarantee that this will work for you!