Activating the mysql_clear_password plugin

Hi everyone, I need to use the mysql_clear_password plugin. I'm using the CentOS php 5.3.3 and manually recompiled the mysql & mysqli extensions with the Oracle MySQL 5.5 libraries. According to the MySQL documentation ( http://dev.mysql.com/doc/refman/5.5/en/cleartext-authentication-plugin.html), I need to either set the LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN or set the MYSQL_ENABLE_CLEARTEXT_PLUGIN option to the mysql client. I tried to set the LIBMYSQL_ENABLE_CLEARTEXT_PLUGIN via a SetEnv in Apache with no results. Could anyone help me setting the MYSQL_ENABLE_CLEARTEXT_PLUGIN option to the mysql client ? Regards, Pierre-Gildas MILLON pg.millon@gmail.com