I was about to compile nvidia driver and found that linux-source contains only the patches on Slitaz 4.0-RC2.
Slitaz 4.0-RC2:
root@slitaz:~# tazpkg get-install linux-source
root@slitaz:~# ls -l /mnt/usr/src/
drwxr-xr-x 3 root root 4096 Mar 12 17:04 kernel-patches
root@slitaz:~#
Slitaz 3-stable:
root@slitaz:~# tazpkg get-install linux-source
root@slitaz:~# ls -l /usr/src/
lrwxrwxrwx 1 root root 21 Mar 12 17:29 linux -> linux-2.6.30.6-slitaz
drwxrwxr-x 24 root root 1024 Mar 12 17:32 linux-2.6.30.6-slitaz
root@slitaz:~#
Well, I might be missing something, but I need more than the patches to get this nvidia working.