Package: btrfs-progs Version: 6.1.2-1 Severity: normal for the purpose of helping people to move away from reiserfs, it would make sense to actually build btrfs-convert with support for it.
the catch is that libreiserfscore is not packaged separately; rather, it's built into reiserfsprogs. i guess factoring out a static-only libreiserfscore-dev would make sense.