Set up Icecast, continued
Start icecast when the system boots
Edit /etc/rc.local to include a section like this:
if [ "$1" = "" -o "$1" = "icecast" ]; then
if [ -x /usr/local/bin/icecast -a \ 
     -f /var/icecast/icecast.xml ]; then
  echo -n ' icecast'
  /usr/local/bin/icecast -b \ 
     -c /var/icecast/icecast.xml > /dev/null
fi
fi

Note: This section must appear before the section for mpd.  I put it
immediately before mpd.