Since pkgsrc uses a different way to install djbware, I think the
question is not entirely off-topic here. If it still is, please forgive
me. :-)

So, I would like to set a listen IP for dnscache that is
different than 127.0.0.1. I tried editing /usr/pkg/etc/dnscache/env/IP
accordingly but no success. I also renamed the aforementioned directory
and created one with dnscache-conf but no success. I would like to use
this as a caching DNS server for a certain subnet.

Any ideas? Thanks in advance.