I used ack.vim for this.
You may need to install ack in advance if you have not already installed it. There are installation instructions on the vim-scripts page, but here is what I did (I don't use macports):
curl http://betterthangrep.com/ack-standalone > /tmp/ack sudo mv /tmp/ack /usr/local/bin/ack sudo chmod 0755 /usr/local/bin/ack
What I have in the installation file for my vim configurations is here .
Bill turner
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