Config OpenLDAP with different Berkley lib

export CPPFLAGS="-I/opt/BD4.7/include/"
export LDFLAGS="-L/opt/BD4.7/lib/"
export LD_LIBRARY_PATH="/opt/BD4.7/lib/"
./configure --prefix=/opt/openldap --disable-ipv6 --enable-crypt

If you have a current version of Berkley DB installed on your system make sure you remove the old db libraries files. Usually in /usr/lib/libdb*

Also add /opt/BD4.7/lib to /etc/ld.so.conf and rerun ldconfig