Your package R-lmtest failed to build from source in current F28. https://koji.fedoraproject.org/koji/taskinfo?taskID=24764429 For details on mass rebuild see https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
*** Bug 1552651 has been marked as a duplicate of this bug. ***
This was rebuilt on F28, but is still broken on Rawhide.
I found the rebuilt for F28 x86_64 (R-lmtest-0.9.35-4.fc28) at: https://koji.fedoraproject.org/koji/packageinfo?packageID=6376 and downloaded the package manually. It installed without problems. I cannot find an entry at "https://bodhi.fedoraproject.org/" in order to give karma. Am I missing something?
No, you're right, it was rebuilt after the branch split, so it never really got into F28. Spot's rebuild for R 3.5.0 should have covered this in 28 and Rawhide.