So as you may have seen, I've been playing with the community build system today. The authentication and certificates all seem to have worked flawlessly, so thank you! But now I'm running into some errors with the build and I'm not sure how to debug them. In both cases, if I'm reading this right, the 64-bit build fails with this: DEBUG util.py:283: Error: No Package found for /usr/include/gnu/stubs-32.h In both cases, the rpm builds just fine on my dev box. The file in question is owned by glibc-devel; and "rpm -q --whatprovides" finds it just fine. Any ideas? Below are the commands I've run along with links to the cbs builds. The first is a development branch (but is publicly available on github). The second is the one currently available in the xen4centos repos. git repo can be found at https://github.com/gwd/sig-virt-xen.git git checkout out/update-4.4.1-rc1-ee81dda-RFC rpmbuild --define "_topdir $PWD" -bs SPECS/xen.spec koji build --scratch bananas6-el6 SRPMS/xen-4.4.1-0.1rc1.el6.src.rpm https://cbs.centos.org/koji/taskinfo?taskID=376 git checkout xen rpmbuild --define "_topdir $PWD" -bs SPECS/xen.spec koji build --scratch bananas6-el6 SRPMS/xen-4.2.4-30.el6.src.rpm https://cbs.centos.org/koji/taskinfo?taskID=380 Thanks! -George