So I've narrowed down the problem to only these 3 files, they need to be patched/updated to work with the latest version. Will do it tomorrow when I have time.
patch:
* ./samples/iredmail/iredmail.mysql (rank is a reserved word)
* ./samples/mysql/sql/remote_grant_permission.sql (doesn't work anymore)
* ./samples/mysql/sql/init_vmail_db.sql (doesn't work anymore)