Your package laby failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=24810600 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
Reported upstream: https://github.com/sgimenez/laby/issues/53
I can workaround that by setting -unsafe-string via the `OCAMLPARAM environment variable: export OCAMLPARAM="safe-string=0,_" Looks like this is a typical issue with 4.06.0 since the default has switched from unsafe-string to safe-string.
Created attachment 1409487 [details] Spec file fix
laby-0.6.4-9.fc28 has been submitted as an update to Fedora 28. https://bodhi.fedoraproject.org/updates/FEDORA-2018-ece6c49e58
laby-0.6.4-9.fc28 has been pushed to the Fedora 28 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-ece6c49e58
laby-0.6.4-9.fc28 has been pushed to the Fedora 28 stable repository. If problems still persist, please make note of it in this bug report.