dovecot - Jun 2006 - b8 fails with ACL plugin on

After upgrading to b8 using the ATrpm with the ACL plugin on it fails:

# /etc/init.d/dovecot start
Starting Dovecot Imap:
Edlopen(/usr/lib/dovecot/imap/lib01_acl_plugin.so)
failed: /usr/lib/dovecot/imap/lib01_acl_plugin.so: cannot open shared
object file: No such file or directory
Error: imap dump-capability process returned 22784
                                                           [FAILED]

Anyone able to help be troubleshoot this?

Gavin