[CentOS] kernel compile for i586

I created a i586 install image with qemu.
I downloaded the SRPMS package for the kernel and installed it.
I cd /usr/src/redhat/SPECS
rpmbuild -bp --target i586 kernelXXX.spec
I does a bunch of things but it did not build a new kernel and put it in 
/boot

I think I am missing a command to actually BUILD the kernel.
What is it?

Thanks,

Jerry