Cyrus IMAP 2.5.10 BerkeleyDB use?

[Kenneth Marshall]

Hi Cyrus Developers,

We are running version cyrus-imapd-2.5.10, and even though no databases
in imapd.conf default to berkeleydb, something is still using it. Here
are our database definitions from our imapd.conf:

duplicate_db_path: /dev/shm/cyrus-imapd/duplicate_db
statuscache_db_path: /dev/shm/cyrus-imapd/statuscache_db
annotation_db: skiplist
duplicate_db: skiplist
mboxkey_db: skiplist
mboxlist_db: skiplist
ptscache_db: skiplist
quota_db: quotalegacy
seenstate_db: skiplist
statuscache_db: skiplist
subscription_db: flat
tls_sessions_db: skiplist
userdeny_db: skiplist

What am I missing?

Regards,
Ken