[Zope] LDAP user folder.

Hi, I want to use LDAP user folder in my zope(2.5.1) installation. I have dowloaded the same and put that in the zope's products folder, but I am not seeing it in the types' drop down when I access zope's management interface. It is said in the installation document that ldapmodule.so is required to use LDAP user folder, but I dont find any. Where can I get the same and where should I put that in order to get it working? Please help. Its a very urgent requirement. Thank you. Regards, Paul.