PHP linux interbase Apache

Hi all I'm new on PHP. I've installed PHP interbase Apache correctly. But I would like to connect Interbase database through PHP. So I enable interbase support for php by doing this : ./configure --with-interbase --with-apache --enabled-track-vars make make install Evreything works fine When I do this : <? $conn=ibase_connect("192.168.2.2:/opt/interbase/examples/employee.gdb", "SYSDBA", "masterkey"); if (!$conn) { echo "Access Denied!"; exit; } ?> my browser say :Call to undifined function :ibase_connect. I understood that I must enable the extension in php.ini. I think the extension was automatically added to my php.ini but I can not find any entry in php.ini for interbase. If someone could help TIA Steph