upgrade openldap on suse 7.0

hello, we use the suse email server II (suse 7.0) with openldap 1.2.13-1 i want to upgrade openldap to 2.x.x on the suse ftp-site for suse 7.0 is nothing (only for suse 7.2 but it does not work) when i configure openldap 2.0.25 (from openldap.org) i get an error: configure: error: could not locate usable POSIX Threads to install openldap 2.0 i have to migrate to suse7.2 or higher is ther somebody who have done this bevor ?? thankyou luis