There are some reasons to use bind from ports and not from world. One reason could be if you want to use DLZ.

Configure world

We are going to remove bind from world but to keep the bind configs and scripts.

src.conf

Create or change /etc/src.conf and place following vars in this file:

WITHOUT_BIND_DNSSEC="YES"
WITHOUT_BIND_LIBS_LWRES="YES"
WITHOUT_BIND_NAMED="YES"
WITHOUT_BIND_UTILS="YES"

Details of this configuration are documented in man src.conf

$ cd /usr/src
$ make buildworld
$ make installworld
$ make -DBATCH_DELETE_OLD_FILES delete-old
$ make -DBATCH_DELETE_OLD_FILES delete-old-libs

If you are missing /usr/src or are unsure, read this.

$ cd /usr/src
$ mergemaster

$ cd /usr/ports/dns/bind98
$ make config

Select “REPLACE_BASE” and start the build

$ make install clean

Switch it on and start it

$ echo 'named_enable="YES"'>>/etc/rc.conf
$ /etc/rc.d/named start