The code does not build on 32 bit architectures. Reproducible: Always
It has not been required to file bugs like this since Fedora 37, see: https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval#Scope Leaf packages can just add "ExcludeArch: %{ix86}" and be done with it.
FEDORA-2025-d149694ad6 (grout-0.5-4.fc42) has been submitted as an update to Fedora 42. https://bodhi.fedoraproject.org/updates/FEDORA-2025-d149694ad6
FEDORA-2025-d149694ad6 (grout-0.5-4.fc42) has been pushed to the Fedora 42 stable repository. If problem still persists, please make note of it in this bug report.