php5 port and dba_open()

Hey group, I just setup apache2, mysql5 and php5. However, I get an error when I make a call to dba_open(). Fatal error: Call to undefined function dba_open() in /... Looking at the output of a call to phpinfo() I see this compile option: --enable-dba I looked around for any loadable modules, but did not find any modules. Is this a bug in the php5 build or am I missing something? Thanks, Jim