CAS 4.0 and LDAP server authentication

CAS 4.0 and LDAP server authentication

I have a question about Jasig CAS v. 4.0 RC2
I'm using this version downloaded from the Git repository. I would like to
configure CAS with my LDAP server.
With version 3.5.2 I can do this.
On CAS v.4.0 RC2
I did not understand well how to write (structure) file to add
authentication with LDAP. I see some differences with the older version. I
followed this link but I think it has changed the structure of this file
in verisone 4.
Can anyone tell me how this should be changed?