A sample ht://Dig config file has been installed to
@PREFIX@/etc/htdig/htdig.conf, unless that file existed already.
The sample @PREFIX@/bin/rundig script may be run to create a database
in the newly created empty directory, /var/db/htdig. A sample search
form, which may be used to search that database, has been installed to
@PREFIX@/share/examples/htdig/search.html.

For an example of how to set up ht://Dig and integrate it with your web site, 
you may wish to examine the scripts installed into
/var/wwwoffle/html/htdig/scripts by the www/wwwoffle package.