I've had very similar problems building in-house Openstack RPMs for CentOS 6 (now using Juno.) You might have better luck in the future just grabbing the el7 s

I've had very similar problems building in-house Openstack RPMs for CentOS 6 (now using Juno.) You might have better luck in the future just grabbing the el7 stuff (or Fedora 20) and build them using the CentOS spec file: http://pkgs.fedoraproject.org/cgit/pandoc.git/tree/?h=epel7 http://pkgs.fedoraproject.org/cgit/pandoc.git/tree/?h=epel7