Did you not read the release notes on the first installation CD or on the DVD???
http://fedora.redhat.com/docs/releas...ISO/#sn-Kernel
You need to install the source kernel; rpm -ivh kernel-<version>.src.rpm
Then you need to prep the source(both ways as a non-root user and as root);
(non-root); cd ~/rpmbuild/SPECS
(as root); cd /usr/src/redhat/SPECS
rpmbuild -bp --target $(uname -m) kernel-2.6.spec