I've stumbled upon this and requeued the build: http://buildsys.fedoraproject.org/logs/fedora-5-epel/37467-docbook2X-0.8.8-1.el5/ppc/job.log
I'm not sure whether there are any other similarly failed builds so I rather open this ticket.
As we moved to koji now, plague has been switched down and is no longer supported in Fedora infrastructure as a build server.
All builds go to koji now.
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