bzr got deleted from openbsd ports about 2 years ago (died along with Python2). https://cvsweb.openbsd.org/ports/devel/bzr/Attic/Makefile?only_with_tag=HEAD bzr was superseded by brz but brz never made it into the openbsd ports. Who can I nudge to include this port? freebsd port -- https://www.freshports.org/devel/brz/
-alfred