Install in /usr/local/bin/notify-compass and chmod +x it
#!/bin/bash
BASE="/path/to/compass_root_dir"
FILE="$1"
LINE="$2"
shift
shift
/usr/local/bin/growlnotify --image /path/to/a/pretty/compass.ico -n compass-cli --url "subl://open/?file=$BASE/$FILE&line=$LINE" $*
# regex: \s+error.*\(Line (\d+) of ([^:]+): (.*)\)
# Run Command
# Command: echo '\3' | /usr/local/bin/notify-compass '\2' '\1' -t "\2:\1"