I am not able to find the ldap subsystem as described in
http://docs.alfresco.com/community/tasks/auth-subsystem-chain-config.html
My Authentication directory does not contain a ldap directory
# ls -l tomcat/webapps/alfresco/WEB-INF/classes/alfresco/subsystems/Authentication/ drwxr-xr-x 2 root root 6525. Feb23:24 alfrescoNtlm drwxr-xr-x 2 root root 4025. Feb23:24 external drwxr-xr-x 2 root root 7325. Feb23:24 kerberos drwxr-xr-x 2 root root 6525. Feb23:24 passthru
Is this something I have to install separately ?