kernel source tree

[Richard Lyons <richard@the-place.net>]

Another really dim question coming up...

I'm trying to install thinkpad drivers for Debian. Instructions say to 
unpack the thinkpad.tar.gz (no problem there) and then to "cd to the 
root of the source tree for the kernel for which you want to compile 
modules, e.g., /usr/src/linux. Run 'make-kpkg --rootcmd=fakeroot 
modules-image'..."  I innocently assumed the root of the source tree 
would be /usr/src/linux-2.4.22.  But when I do  'make-kpkg 
modules-image', I get:
  "We do not seem to be in a top level linux kernel source directory 
tree..."
So I am evidently wrong.  I tried installing (via aptitude) the 
kernel-source-2.4.22 package, and also kernel-headers-2.4.22-xfs-386, 
but that didn't help.  

Can someone kindly tell me what is meant by "the root of the source 
tree"?  

I really shall have to find time to learn about sources and compiling 
one day -- it is always like cooking while blindfolded and with a 
clothes-peg on your nose...

-- 
richard