I think he means that the bundled spec in 2.2.5 and 3.0.3 produced an error when you run rpmbuild. Which is true (due to addition of some config files and/or modules, IIRC). The fix is already in git. The packages on opensuse build service already contain that particular packaging fix.
Yes, I’m aware of the bundled spec being dodgy, however, he referred to the Diamond page, which contained links to fixed (and RHEL/Fedora-derived) specs for both 2.2.3 and 3.0.1/2 which were simple drop-ins. If there were any issues with the instructions on the page, it would be nice to know. Stefan Janet(UK) is a trading name of Jisc Collections and Janet Limited, a not-for-profit company which is registered in England under No. 2881024 and whose Registered Office is at Lumen House, Library Avenue, Harwell Oxford, Didcot, Oxfordshire. OX11 0SG. VAT No. 614944238