[Dovecot] lib02_imap_quota_plugin.so: undefined symbol: quota

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Hi folks.

We're trying to set up Dovecot with Maildir++ quotas.  Operating system is
CentOS 4.3 (final) X86 using Dovecot 1.0b5.

After logging in, I get the following logged through syslog and the
connection closes:

Apr  6 10:39:36 dev3 dovecot: imap(jtest): Loading modules from directory:
/usr/local/lib/dovecot/imap
Apr  6 10:39:36 dev3 dovecot: imap(jtest):
dlopen(/usr/local/lib/dovecot/imap/lib02_imap_quota_plugin.so) failed:
/usr/local/lib/dovecot/imap/lib02_imap_quota_plugin.so: undefined symbol:
quota
Apr  6 10:39:36 dev3 dovecot: imap-login: Login: user=<jtest>,
method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, secured
Apr  6 10:39:36 dev3 dovecot: child 23750 (imap) returned error 89

My dovecot.conf:

protocol imap {
  mail_plugins = quota_plugin imap_quota
  mail_plugin_dir = /usr/local/lib/dovecot/imap
  imap_client_workarounds = outlook-idle delay-newmail
}

Can someone point us in the right direction?

Thanks.

Steve