Ok, heres my situation:

A debian system running XFree86 4.1.0/4.2.0 (not sure which X)
Kernel 2.2
130 free mb hd space.

I want to install blackbox as a wm, I don't have/want KDE or Gnome (too big). When I try to compile it it says cant find x. I know its there I'm in it now using twm which I dont like. My guess is I am missing the x headers and such. I only downloaded what the readme said required. Where can I get the mssing files and do I have enough space to install blackbox, I only want these files for this then I'll rm them, also is the a smaller wm that lets me close a window without losing all the others (Opera)

Sorry for bad punctuation but im in a hurry (nagging parents)

If you're using Debian, you don't need to compile blackbox, it's available as a Debian package.

apt-get install blackbox

Regards

Otherwise if you want to compile, you can do:
apt-cache search kernel-header

This will give you the exact kernel-header name

Then:
apt-get install kernel-headerx.x.x

After that you have to make a symlink to:
ln -s /usr/src/kernel-headerx.x.x /usr/src/linux

If you used the x that followed debian woody it´s 4.1 (4.2 has just been released today check http://www.debianplanet.org )

thx guys this is great the get-apt worked. I read your post, did that and 10 minutes later I am typing this. Thanks a lot!

incidentally, it wouldn't compile because you presumably haven't got the x DEVELOPEMENT package installed.

Blackbox rocks btw. good choice.