On the big-endian s390x architecture, ocrmypdf fails to build from source because python3-img2pdf is not available:

No match for argument: python3dist(img2pdf) >= 0.4.4

This is a case of https://docs.fedoraproject.org/en-US/packaging-guidelines/#_noarch_with_unported_dependencies.

Blocking F-ExcludeArch-s390x per https://docs.fedoraproject.org/en-US/packaging-guidelines/#_architecture_build_failures.

It looks like python-img2pdf cites

  # cf. Bug 1851638 - img2pdf fails to build on s390x because of issues in the ImageMagick dependency
  # https://bugzilla.redhat.com/show_bug.cgi?id=1851638

for excluding s390x. I am not sure if this issue has been fixed or not; however, python-img2pdf currently FTBFS on F41 and F40 due to problems finding ICC profiles in the tests, and I did not have time to dig into it further.

For ocrmypdf, it would be best to either add

  # Unported dependency python-img2pdf (RHBZ#THISBUG)
  ExcludeArch:    s390x

or help fix python-img2pdf on s390x.