From ArchWiki

Modify the official PKGBUILD

I modified slightly the stock PKGBUILD so it is just a matter of changing the pkgname variable to obtain a kernel installable side by side. If these small modifications were included in the official PKGBUILD, it would be even simpler! Keeping "pkgname=kernel26" should build the stock kernel. The patch is on the forum: http://bbs.archlinux.org/viewtopic.php?pid=282844

Instead of keeping a Wiki in sync by changing each time the PKGBUILD, why not have a PKGBUILD which is easy to modify? A simple abs sync, pkgname change and voila. I find this way more KISS then the wiki page...

Grep

I don't know who wrote this:

cat ./patchname | grep +EXTRAVERSION=

but he wins a useless use of cat award ;)

Issues with 2.6.24 custom kernels

As you probably all know, this page needs updating for 2.6.24 (and future kernel versions) for the custom kernel to provide sources for things such as nvidia and vmware. See this thread for more information.

I think we should correct the path to the original Arch config: on my system it's placed in /var/abs/core/kernel26/