Hi, On Thu, Sep 11, 2008 at 16:27, Robert Moskowitz <rgm at htt-consult.com> wrote: > Unknown tag: % define buildid .hipl0809111 Maybe because there is a space after the "%" and before "define"? Try removing that space and see if that works. If you are still not doing it, I suggest you follow the steps on this document: http://wiki.centos.org/HowTos/Custom_Kernel HTH, Filipe