At this time we don't support x86_64. I'm working on getting another build box and a build system that will work for x86_64. Theoretically, the Fedora Extras build software will come online rather soon, and I can re-deploy our current build box so that it could handle both 32bit and 64bit package building. Race condition, which will be done first? (:
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings