mileszs/ack.vim — pull request #88 by hdeshev (2013-08-21 06:33:52+00:00)
Title: Only append -H and --column args if not doing filename search.

Newer ack versions disallow using the -H/--column args together with -g

I hit this problem on Fedora 19, but I guess most cutting edge Linux distros (ArchLinux?) would have it too.