ldap_connect error

Hi I am running a LAMP setup consisting of Debian (testing), PHP4, Apache2, and MySQL 4. When I installed php, I used apt-get, and included in the list of modules was libapache2_mod_php4 php4 php4-ldap ... PHP works fine, and a test phpinfo() brings up all of the expected parameters (at least I think it does). The one thing that doesn't work is ldap. I have enabled the ldap modules - a2enmod ldap - and this doesn't throw an error, it just prompts for the apache restart which in turn restarts fine. BUT if I run a very simple ldap_connect (see script) I get this error; Fatal error: Call to undefined function: ldap_connect() in /www/stevedev/vhtdocs/ldap/index.php on line 27 So it appears that the ldap hasn't got itself running with php. The very simple test script I used was; $ds = ldap_connect('ldap.<our server>.net'); if ($ds) { ldap_bind($ds); echo 'connected'; } else { echo 'not connected'; } Has any one got any ideas of why this error get thrown? Regards Steve