ldapsearch supportedSASLMechanisms : ANONYMOUS is missing

[FM <dist-list@LEXUM.UMontreal.CA>]

version openldap 2.2-2.2.17

Hello,

I used the excellent how-to from www.bayour.com for my LDAP installation 
(But I'm using RHEL so I use RPMS instead of recompiling packages).

When I do :
ldapsearch -h localhost -p 389 -x -b "" -s base -LLL supportedSASLMechanisms

I only have supportedSASLMechanisms: GSSAPI

I'd like tu use userPassword: {KERBEROS}user@<MY KERBEROS REALM>
so (I think) I need supportedSASLMechanisms: Anonymous

I check the source package of cyrus-sasl and I have --enable-ano

in my slapd.access my first rule is :
access to dn.exact=""
        by * read

Is there a configure argument that I missed in openldap to enable this 
mechanisms ? Or could it be a access prob ?

Thanks !