dh: warning: Implicitly activating single-binary dh addon for backwards compatibility. In compat 14+, dh: warning: this fallback will *not* happen automatically via dh_auto_install will instead use a dh: warning: different default for --destdir unless the single-binary add-on is active, dh: warning: which can cause the source to produce an empty binary package dh: warning: dh: warning: To keep the existing behaviour (compat 13) Should these compat levels be 15+ and 14 instead? debhelper-compat-upgrade- checklist suggests that.