Looking in the source RPMs from http://download.opensuse.org/repositories/network:/ldap:/OpenLDAP:/RE24/openSUSE_11.2/src/
The openldap2-2.4.25-141.1.src.rpm gives this for the build configuration in the openldap2.spec file.
%configure \
--localstatedir=/var/run/slapd \
--libexecdir=/usr/lib/openldap \
--enable-wrappers \
--enable-spasswd \
--enable-modules \
--enable-shared \
--enable-dynamic \
--with-tls \
--with-cyrus-sasl \
--enable-crypt \
--enable-ipv6=yes \
%if "%{name}" == "openldap2"
--enable-aci \
--enable-bdb \
--enable-hdb \
--enable-rewrite \
--enable-ldap=yes \
--enable-meta=mod \
--enable-monitor=yes \
--enable-perl=mod \
--enable-sql=mod \
--enable-slp \
--enable-overlays=mod \
--enable-syncprov=yes \
--enable-ppolicy=yes \
%else
--disable-slapd \
%endif
--enable-lmpasswd \
--with-yielding-select
Looking at the 8th flag down, I see --with-tls specified.
If you need the configuration for a different release of openSuSE, I'm sure you can find a similar line in another source RPM, however, I doubt that the compile flags change very much from release to release.