RHEL4 and Kernel Build from Source incl. xen source

[Thomas.vonSteiger at swisscom.com]

Hello,

I like to patch the RHEL4 Kernel with xen Source. 
For this i need kernel.src.rpm, kernel-devel.rpm and xen Source. 
With "rpmbuild --bp" i can create BUILD tree with all patches. 
How i can go forward now with kernel-devel and /usr/src/redhat/BUILD
Kernel Source ? 
Is there a howto about using kernel-devel with kernel.src for RHEL4 ? 

regards, 
Thomas