PHP and LDAP -- can't connect

Short: I cannot get ldap_conect() to work. Using PHP 4.0.0 openldap-1.2.9-6 / openldap-devel-1.2.9-6 (redhat 6.1 rpms) Unable to use ldap_connect() (or variations -- ldap_connect(host), ldap_connect(host, port)). Long: I can write a simple C program that uses ldap_open() or ldap_init() from openldap and all seems to work fine. Using PHP's ldap, I get a null return from ldap_connect(). I added some debugging to the ldap.c file and get an error of 2 after an ldap_init() which basically means "No suck file or directory" (or so strerror() says). If I change ldap_init() to ldap_open() I also get an error. I gett his problem in PHP3 and PHP4... 1) has anyone seen this before (I can't find it in any archives) ? 2) Thoughts on how to get this working? -- -rupa