Package: libsubunit-dev Version: 1.1.0-3 Because libsubunit-dev is not flagged as Mult-Arch: same, one cannot install for multiple architectures. This affects correct, depending packages, such as "check".
Btw. the VCS field - or Alioth Git - is broken: https://anonscm.debian.org/cgit/openstack/subunit.git/ says "No repositories found".
