nss_ldap wants openldap 2.3.41 - have 2.4.8

[Jason Garrett]

This is most likely a dumb question, but how do I tell ports to build
nss_ldap against openldap-2.4.8?

The build of nss_ldap fails with conflicts.

===>  Installing for openldap-client-2.3.41

===>  openldap-client-2.3.41 conflicts with installed package(s):
      openldap-client-2.4.8

      They install files into the same place.
      Please remove them first with pkg_delete(1).
*** Error code 1

Stop in /usr/ports/net/openldap23-client.
*** Error code 1

Stop in /usr/ports/net/nss_ldap.