[CentOS] cyrus-sasl errors: SQL engine 'mysql' not supported

Hi, I was wondering if I could get a little help with troubleshooting/configuring the cyrus-sasl package for Centos 4.4 to build properly with mysql support,for my mail server

' not supported myhost postfix/smtpd[3641]: SQL engine 'mysqlJan 21 10:55:27 myhost postfix/smtpd[3641]: auxpropfunc error no mechanism available when I put the following in /usr/lib/sasl2/smtpd.conf

pwcheck_method: auxprop auxprop_plugin: sql sql_engine: mysql sql_hostnames: localhost sql_user: vmail sql_passwd: password sql_database: postfix sql_select: select clear from postfix_users where email='%u@%r' smtpaccess='Y' Hope you can help me,thank you very much. Sincerly' dennis