I'm developing a script that I use for fetching various CIDR tables such as http://www.spamhaus.org/drop/drop.txt that is the SpamHaus's famous drop list and the script loads the downloaded lists to tables that are in PF ruleset. I'd like to turn the script into a port and I'd like it to be installable with a customizable $PREFIX. The Makefile and the script itself are now hard-coded to use /usr/local as PREFIX. I know how to create a configure script using devel/autoconf having used it for years in my work. However, I feel that using devel/autoconf is a major overkill for the job of just doing a few macro substitutions. Is there anything out there that could automate this type of simple task? I could write the configure script by hand but that feels like re-inventing the wheel...