To get the opendap dynamic libararies, all of openldap must be installed. LDAP clients (in future, programs like sendmail, postfix, php?, etc.) shouldn't have to have all of openldap, including the server, installed to use the dynamic libraries.
This has just gone into our build tree. The next Raw Hide snapshot will have openldap, openldap-devel, openldap-servers, and openldap-clients.