Thus said James E Keenan on Wed, 31 Jan 2018 22:09:15 -0500
As a freeBSD user, I don't use the port for ack. I simply download the
single file and put it in my ~/bin directory.
You could do that and report any errors you have when using ack on
freeBSD, that way when it's out of beta, we'll know it works well in the
port/package.
https://beyondgrep.com/ack3/