message: Link OpenLDAP with GnuTLS.
diff: @@ -1220,6 +1220,7 @@ using python : %(python_version)s : %(python_prefix)s/%(python_bin)s : %(python_
  )
  ldap_config = drake.cxx.Config(cxx_config)
  ldap_config.add_local_include_path(ldap_prefix / 'include')
  + ldap_config.lib('gnutls')
  drake.Rule('openldap') << ldap_targets
  ## ------------- ##
  