1. copy kernel-2.6.15-1.2054_FC5.src.rpm /usr/src/redhat/SRPMS/

2. cd /usr/src/redhat/SRPMS/

3. rpm -Uvh kernel-2.6.15-1.2054_FC5.src.rpm

4. cd ../SPECS

5. rpmbuild -bp --target=$(uname -m) kernel-2.6.spec

7. cd ../BUILD/kernel-2.6.15/linux-2.6.15.i686

8. make all

9. make modules_install

10. make install

11. reboot