ld: fatal: Symbol referencing errors

During the compilation of PostgreSQL 8.3.6 on Solaris 10 1/06
s10a_u1wos_19a, I received the following error:
Undefined symbol ldap_start_tls_s first referenced in file libpq/SUBSYS.o

Using the nm command against the /usr/lib/libldap.so file did not locate
the ldap_start_tls_s object.

I had used the -with-ldap command in the configure script to then
execute the gmake install.