Launchd plist to run camper_van and accompanying install script.

install.sh

#!/bin/sh
gem install camper_van

CAMPER_VAN="`which camper_van`"
if test \! -x "$CAMPER_VAN"; then
	echo >&2 "error: camper_van not found on path - unable to install plist"
	exit 1
fi

# Substitute in the fixed path to use to launch camper_van.
sed -i '' -e "/CAMPER_VAN_BIN_PATH/s##$CAMPER_VAN#" local.camper_van.plist

# Copy the plist to /Library/LaunchDaemons and fire 'er up.
sudo install -d /Library/LaunchDaemons
sudo cp local.camper_van.plist /Library/LaunchDaemons
sudo launchctl load -w /Library/LaunchDaemons/local.camper_van.plist
# Now configure your IRC client to connect to localhost:6667 with password
# of orgname:apikey. Orgname is what you visit to view Campfire on the web,
# http://orgname.campfirenow.com. Your API key can be found as part of
# your Campfire user profile on the Campfire website.

local.camper_van.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Disabled</key>
	<false/>
	<key>Label</key>
	<string>local.camper_van</string>
	<key>Program</key>
	<string>CAMPER_VAN_BIN_PATH</string>
	<key>Sockets</key>
	<dict>
		<key>irc-bridge</key>
		<dict>
			<key>SockServiceName</key>
			<string>6667</string>
		</dict>
	</dict>
</dict>
</plist>

fyi, i had serious issues getting this to work with rvm. switching to rbenv allowed me to use this method as rbenv uses shims to replace the global ruby installation.