Oooops, one more question. :-)
If I just rebuilt the source rpm, then I guess I need to build a binary package after I install the newly rebuilt source package, right?
TIA
Ok, based on your feedback I noticed it is Matthias (freshrpms) his proftpd package :) Try something like this:
rpmbuild --rebuild --with ldap --with mysql --with postgresql proftpd*.src.rpm
That should work.