On Mon, Mar 23, 2015 at 4:01 PM, Anssi Johansson <centos@miuku.net> wrote:
You will need to use the get_sources.sh command as described on http://wiki.centos.org/Sources to get the source tarball.

Thanks - get_sources.sh is the part I was missing. To get the file name to match what the spec expected, I just had to:

mv SOURCES/kernel-rt-3.10.0-229.rt56.141.el7{,.centos}.tar.xz