Source: birdtray Version: 1.4-1 Thunderbird is currently not available on all release architectures in either Debian or Ubuntu. (In Ubuntu, it is not building on s390x).
I think it's a problem to have uninstallable (arch:any) binary packages on release architectures. Please consider adding a Build-Depends on thunderbird for this issue. I think you'll then need to follow up by asking for birdtray to be removed from architectures where it no longer builds. Thanks, Jeremy Bicha
