Hi Dovecot 2.3.9 does not build on FreeBSD 11.3. I've posted to the mailing list of Dovecot about it: https://dovecot.org/pipermail/dovecot/2019-December/117743.html Feel free to contribute here or on the list. Greetings Pascal
Well patch will be commited soon and maintainer is working on ;) Thx Larry!
FTR, upgrade committed in r519037