I'm posting this under general, as there is no problem with hardware (just with building a driver module on one specific kernel) and it should most likely be independent from a certain distribution.
It is only related to the patched kernel image yo can install from http://www.anoubis.org
, as I want to evaluate the anoubis security suite which seems to be the only Application Level Firewall for Linux currently available.
Therefore, running Linux Debian 5.0 ("Lenny") I ...
1) installed the packages
xanoubis_0.9.3_i386.deb (as instructed on the develeopers' page),
2) booted into the new installed kernel (18.104.22.168-anoubis),
At this stage a first attempt to install the NVIDIA driver failed, complaining about missing kernel sources, therefore I
3) installed the most appropriate kernel source package (linux-source-2.6.32)
4) extracted it (tar -xjf linux-source-2.6.32.tar.bz2) to /usr/src/linux-source-2.6.32,
5) symlinked that to /usr/src/linux.
6) fetched the new kernels config by "cp /boot/config-22.214.171.124-anoubis-0.9.3.25.281.564 /usr/src/linux/.config"
7) ran "cd /usr/src/linux ; make oldconfig && make prepare"
Finally I supposed to be ready to install the NVIDIA driver the usual way (invoking "NVIDIA-Linux-x86-195.36.15-pkg1.run" as root), but it failed with "unable to build nvidia.ko", and unfortunately there was no further hint inside /var/log/nvidia-installer.log.
As we need full 3D support, we still depend on this proprietary driver.
Therefore any suggestions welcome how to compile it in the given situation above would be appreciated!