The "Error out on failing builds" part is not applied in Debian. Have you verified that the package builds fine on Ubuntu?
** Changed in: matplotlib (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1863528 Title: Sync matplotlib 3.1.2-2 (universe) from Debian unstable (main) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/matplotlib/+bug/1863528/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs