How to configure OpenLDAP to use DIGEST-MD5 - SASL Mechanism

[Laxmi Thota <laxmi@kasenna.com>]

I am using OpenLDAP v2 on Linux with Redhat distribution.

I want to use DIGEST-MD5 - SASL Mechanism for authenticating LDAP clients.

LDAP server query to list the supported SASL mechanisms, does not list 
DIGEST-MD5.

How can I configure OpenLDAP to use DIGEST-MD5 - SASL Mechanism?  Can some 
one please help.

Thanks in advance,
-Laxmi

#
# filter: (objectclass=*)
# requesting: supportedSASLMechanisms
#

#
dn:
supportedSASLMechanisms: GSSAPI

# search result
search: 2
result: 0 Success