Shell backend LDAP as a slave

[Rayed Al-Rashed <rayed.alrashed@saudi.net.sa>]

Grettings everyone,

I am trying to simulate database triggers on LDAP by using a shell
backend, I congiured a shell backend LDAP on a different port, and
replicate the master LDAP to it, so a shell script will be triggerd on
different update operations.

When I tried it, it didn't work, and I found this error in slurp reject
file

	ERROR: Criticial extension is unavailable

What does this mean?! Does it mean that a special extension is needed to
support replication, is it possible to implement as a shell script too?

Thanks for your help.

- Rayed