I made some more patches this month.

The rpm issue gets partially resolved the way upstream intended
by using a variable in %{_smp_mflags} ... and maybe in %jobs

Note: %jobs is SUSE-specific and we want to reduce its use
for more portable .spec files.

Meanwhile, I'm thinking about how to advance part3 of my RBOS-project.
That is the addition of all other bit-reproducible Factory packages to the 3k that were already part of it.
One relatively simple solution would be to construct a 'RBOS-conflicts' metapackage that Conflicts with all the known-bad packages and thus prevents their accidental installation.
There could be a few edge cases such as ceph, that only starts to differ slightly after the year 2038 or colord, that is fully reproducible as long as build machines all have AVX2 available. Should these be blocked, because they are not fully reproducible or be allowed, because it is somehow possible to verify the correctness of binaries?