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python-rpm-macros failed to build from source in Red Hat Enterprise Linux RHEL-9.0.0 Beta

https://brewweb.engineering.redhat.com/brew/taskinfo?taskID=42033220

For details on automatic synchronization of package between Fedora ELN and RHEL-9.0.0 Beta, see the RHEL Developer Guide:
https://one.redhat.com/rhel-developer-guide/#_opting_out_of_fedora_inheritance

This seems to be a repo or a brew issue: 

BuildrootError: could not init mock buildroot, mock exited with status 30; see root.log for more information

https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=1832109 was submitted as a rebuild of the same commit after that transient issue
https://brewweb.engineering.redhat.com/brew/buildinfo?buildID=1832351 is an even newer build