Control: retitle -1 nmu: zeromq3 It seems that it should be nmu instead of gb because currently they are "Installed" state. As buildd given-back action says: > Package in state Installed, cannot giveback. ✗ nmu zeromq3_4.3.5-1+b1 . ANY . unstable . -m "Rebuild to sync with 64bit time_t runtime dependency." Regards,