Hi all,
It's been requested a few times here on the list, so I've posted an ip_wccp patch against kernel 2.6. It includes Henrik's latest version of ip_wccp.c which is linked from the Squid FAQ.
http://www.swelltech.com/pengies/joe/patches/linux-2.6.8-ip_wccp.patch
Note that this is only useful if you're building your kernel from scratch (from an SRPM, for example), and want to be able to configure it as any other module. If you are starting from an existing kernel and source tree, Henrik's make file is a better way to go.
