Error: (Fedora rawhide KOJI )
Problem: package policycoreutils-devel-2.8-1.fc29.x86_64 requires dnf, but none of the providers can be installed
- package selinux-policy-devel-3.14.2-20.fc29.noarch requires policycoreutils-devel >= 2.8, but none of the providers can be installed
- package dnf-2.7.5-14.fc29.noarch requires python3-dnf = 2.7.5-14.fc29, but none of the providers can be installed
- conflicting requests: nothing provides python3-libdnf >= 0.11.1 needed by python3-dnf-2.7.5-14.fc29.noarch

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Solution suggestion:
Untag the broken dnf version?

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Aditional info:
Issue hit by building mariadb package for rawhide.