https://bugzilla.redhat.com/show_bug.cgi?id=1398949
--- Comment #6 from Jeremy Newton alexjnewt@gmail.com --- You need to use BuildConflicts not Conflicts.
As for libclaw, it definitely does exist for f25/26: https://apps.fedoraproject.org/packages/libclaw It was just never rebuilt for f25.
As for plee-the-bear, bear needs to be unbundled after this package is accepted. I would contact the maintainers and open a bugreport (make it depend on this one).