SASL SQL mech support

I have Postfix and Cyrus-SASL installed and running fine. But when I
try to use SMTP Auth with MySQL, it won't work.

I am on FedoraCore5 with the following rpm's:

cyrus-sasl-devel-2.1.21-10
cyrus-sasl-sql-2.1.21-10
cyrus-sasl-plain-2.1.21-10
cyrus-sasl-2.1.21-10
cyrus-sasl-md5-2.1.21-10
cyrus-sasl-ntlm-2.1.21-10
cyrus-sasl-lib-2.1.21-10
cyrus-sasl-gssapi-2.1.21-10

So as you can see the SQL rpm is installed, yet when I run
/usr/sbin/saslauthd -v I get:

saslauthd 2.1.21
authentication mechanisms: getpwent kerberos5 pam rimap shadow ldap

So why isn't the SQL mech supported? And why is the LDAP mech supported
when it is not even installed?

This is really baffling me and I would really appreciate some help
here.

Thanks

Joel Moss