Building drivers on EL4.0 - What happened to kernel-source?

[Waldher, Travis R]

Ok.. I run a make mrproper - 

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[root at b352590-es40 ~]# cd /usr/src/kernels/2.6.9-5.EL-i686/
[root at b352590-es40 2.6.9-5.EL-i686]# uname -a
Linux b352590-es40 2.6.9-5.EL #1 Wed Jan 5 19:22:18 EST 2005 i686 i686
i386 GNU/Linux
[root at b352590-es40 2.6.9-5.EL-i686]# make mrproper
scripts/Makefile.clean:10: Documentation/DocBook/Makefile: No such file
or directory
make[1]: *** No rule to make target `Documentation/DocBook/Makefile'.
Stop.
make: *** [_mrproper_Documentation/DocBook] Error 2
[root at b352590-es40 2.6.9-5.EL-i686]# ls -al
total 404
drwxr-xr-x  17 root root   4096 Feb 16 17:54 .
drwxr-xr-x   6 root root   4096 Apr 11 22:29 ..
drwxr-xr-x  24 root root   4096 Feb 16 17:53 arch
-rw-r--r--   1 root root  48177 Jan  5 16:27 .config
drwxr-xr-x   4 root root   4096 Feb 16 17:54 crypto
drwxr-xr-x  45 root root   4096 Feb 16 17:55 drivers
drwxr-xr-x  54 root root   4096 Feb 16 17:54 fs
drwxr-xr-x  15 root root   4096 Feb 16 17:54 include
drwxr-xr-x   2 root root   4096 Feb 16 17:54 init
drwxr-xr-x   2 root root   4096 Feb 16 17:54 ipc
drwxr-xr-x   3 root root   4096 Feb 16 17:55 kernel
drwxr-xr-x   4 root root   4096 Feb 16 17:54 lib
-rw-r--r--   1 root root  42210 Jan  5 16:27 Makefile
drwxr-xr-x   2 root root   4096 Feb 16 17:54 mm
-rw-r--r--   1 root root 159751 Jan  5 16:27 Module.symvers
drwxr-xr-x  33 root root   4096 Feb 16 17:54 net
drwxr-xr-x  10 root root   4096 May 26 19:08 scripts
drwxr-xr-x   3 root root   4096 Feb 16 17:55 security
drwxr-xr-x  15 root root   4096 Feb 16 17:54 sound
drwxr-xr-x   2 root root   4096 Feb 16 17:54 usr
[root at b352590-es40 2.6.9-5.EL-i686]#
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Notice the error I receive, also notice that I am missing the
"Documents" directory that was always there before with kernel 2.4.x.

So I go to check for missing packages:

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[root at b352590-es40 2.6.9-5.EL-i686]# rpm -qa |grep kern
kernel-utils-2.4-13.1.48
kernel-devel-2.6.9-5.EL
kernel-2.6.9-5.EL
kernel-hugemem-devel-2.6.9-5.EL
glibc-kernheaders-2.4-9.1.87
kernel-2.6.9-6.37.EL
kernel-smp-devel-2.6.9-5.EL
kernel-devel-2.6.9-6.37.EL
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I decide I'm missing kernel-source...

Problem is it doesn't seem to exist.

So what changed in 4.0, and how do I now build network card drivers etc.
if I can't run makes as "normal".

Thanks,
Travis