Neal Gompa writes[1]:

"Not required for this MR, but FYI, this could be made more natural using build conditions:

- %global do_legacy_pkg ! 0%{?rhel}
+ %bcond build_legacy_pkg [ ! 0%{?rhel} ]

And %

can be replaced with %

throughout the spec."

While at it, guard %package and %description sections of legacy packages by the macro as well, suggested by Michel Lind[2].

[1] https://gitlab.com/redhat/centos-stream/rpms/iptables/-/merge_requests/67#note_2206996129
[2] https://gitlab.com/redhat/centos-stream/rpms/iptables/-/commit/4f61921d62f73298201513dc84ee351f607e6e77?merge_request_iid=67