Before I discovered your howto's, I did the following from the root ID:
apt-get install linux-source-2.6.18
tar xjf /usr/src/linux-source-2.6.18.tar.bz2
I also did: apt-get install make gcc
When I tried to run make menuconfig, the compiler choked on the missing .h files it wanted.
Can I just delete the linux-source-2.6.18 directory and follow your HowTo from there?
PS. I also discovered (late) that, when the system was originally built, that ../linux-2-16.8 (one level up from my root directory) was created.