Just recompiled latest version of SASL and Openldap according to intrustion from standford's website, but the result of testing ldapsearch with GASSL support has no much different, here is the result:
root@fbsd [11:09am] [...local/openldap-2.2.11]# ldapsearch -x -LLL -h kerberos -b "" -s base supportedSASLMechanisms dn: supportedSASLMechanisms: OTP supportedSASLMechanisms: DIGEST-MD5 supportedSASLMechanisms: CRAM-MD5
--Quanah
-- Quanah Gibson-Mount Principal Software Developer ITSS/TSS/Shared Services Stanford University GnuPG Public Key: http://www.stanford.edu/~quanah/pgp.html