post_install() {
  echo "Please put the lines"
  echo "(setq load-path (cons \"/usr/share/emacs/site-lisp/ess\" load-path))"
  echo "(require 'ess-site)"
  echo "to your ~/.emacs" 
}
post_update() {
  post_install
}
pre_remove() {
  echo "Please remove the line containing"
  echo "(setq load-path (cons \"/usr/share/emacs/site-lisp/ess\" load-path))"
  echo "(load \"/usr/share/emacs/site-lisp/ess/ess-site\")"
  echo "from your ~/.emacs"
}