Activation of LDAP module

[Fernando Calvelo Vazquez]

Hi guys:

I'm trying to activate ldap authentication part at config files.
But when I uncomment next lines:

       Auth-Type LDAP {
               ldap
       }

I get next error when service starts up


Module: Checking authenticate {...} for more modules to load
/opt/csw/etc/raddb/modules/ldap[29]: Failed to link to module 
'rlm_ldap': ld.so.1: radiusd: fatal: relocation error: file 
/opt/csw/lib/rlm_ldap-2.1.6.so: symbol ber_pvt_opt_on: referenced symbol 
not found
/opt/csw/etc/raddb/sites-enabled/default[284]: Failed to find module "ldap".
/opt/csw/etc/raddb/sites-enabled/default[284]: Failed to parse "ldap" entry.

I don't know what does it mean symbol demanded: 'ber_pvt_opt_on'

Thanks a lot in advance for your reply.
Best regards,

      Fernando.