http://www.lastditcheffort.org/home/aah/proftpd/mod_sql.html you will need to change your proftpd.conf:
Original Directive Replaced With
------------------ -------------
MySQLInfo SQLConnectInfo
PostgresInfo SQLConnectInfo
PostgresPort SQLConnectInfo
SQLAuthoritative SQLAuthenticate
SQLDoAuth SQLAuthenticate
SQLDoGroupAuth SQLAuthenticate
SQLEmptyPasswords SQLAuthTypes
SQLEncryptedPasswords SQLAuthTypes
SQLGidField SQLUserInfo
SQLGroupGIDField SQLGroupInfo
SQLGroupMembersField SQLGroupInfo
SQLGroupTable SQLGroupInfo
SQLGroupnameField SQLGroupInfo
SQLHomedir SQLDefaultHomedir
SQLHomedirField SQLUserInfo
SQLKey SQLUserWhereClause
SQLKeyField SQLUserWhereClause
SQLLogDirs SQLLog
SQLLogHits SQLLog
SQLLogHosts SQLLog
SQLLogStats SQLRatioStats
SQLLoginCountField SQLLog
SQLPasswordField SQLUserInfo
SQLPlaintextPasswords SQLAuthTypes
SQLProcessPwEnt SQLAuthenticate
SQLProcessGrEnt SQLAuthenticate
SQLSSLHashedPasswords SQLAuthTypes
SQLScrambledPasswords SQLAuthTypes
SQLShellField SQLUserInfo
SQLUidField SQLUserInfo
SQLUserTable SQLUserInfo
SQLUsernameField SQLUserInfo
SQLWhereClause SQLUserWhereClause
And finally, you may want to check the README for information on the
following new directives:
SQLAuthenticate
SQLGroupInfo
SQLNamedQuery
SQLShowInfo
SQLUserInfo