https://fedorahosted.org/fpc/ticket/497

Announcement text:

The BuildRequires? section of the guidelines has been revised; the exceptions list is gone. The release engineering folks are free to define the buildroot and rpm is free to change its dependency list.

Since then, the

https://fedoraproject.org/wiki/Packaging:ReviewGuidelines

are out-of-date. The item

MUST: All build dependencies must be listed in BuildRequires, except for any that are listed in the exceptions section of the Packaging Guidelines ; inclusion of those as BuildRequires is optional. Apply common sense.

contains a link to an anchor that no longer exists.

The section about BuildRequires is this: https://fedoraproject.org/wiki/Packaging:Guidelines#BuildRequires_2