dovecot - Apr 2007 - Building Dovecot to link against alternative libldap

I'm running Dovecot on an Ubuntu (Edgy) box.  I'd like to link dovecot
against the latest stable version of the OpenLDAP libraries instead of
the system defaults.  I can't really replace the existing libraries as
other packages rely on them.

If this didn't use libtool, I would be able to influence the runtime
linker by manipulating -rpath and -L.  I can't seem to figure out how
to get this to work with Dovecot's libtool-based build.

The system libldap_r.so.2 lives in /usr/lib
My libldap_r.so.2.3 lives in /usr/local/lib

Anyone have any pointers?

-Ben