From the debian bug, the issue seems to have been related to the libunwind version.
After a simple rebuild, dovecot built successfully in plucky (-proposed?) ** Changed in: dovecot (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2096887 Title: FTBFS in plucky for armhf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dovecot/+bug/2096887/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs