anchor.diff:  }
   
   function unpack_payload(){
  -    if [ `find $INSTALL_DIR -prune -empty` ] ; then
  +    if [ "$FORCE" == "y" ] || [ `find $INSTALL_DIR -prune -empty` ] ; then
           log "Unpacking payload . . ."
           local archive_line=$(egrep --text --line-number '__ARCHIVE__$' $0 | cut -f1 -d:)
           tail -n +$((archive_line + 1)) $0 | tar -C $INSTALL_DIR -xjf - > /dev/null || die "Failed to unpack payload from the end of '$0' into '$INSTALL_DIR'"
  
positive.code:     echo "      directory. Then create a 'current' symlink under install_root to the unpacked"
      echo "      directory once installation is complete replacing the symlink if it already "
      echo "      exists. If this flag is set just install into install_root directly"
      echo "  -y: yes - Don't prompt to clobber existing installations"
      echo "  -v: verbose - More output on installation"
      echo "  -h: help -  Display this message"
  
negative.code:             -v)
                  export VERBOSE=1
                  shift;;
              -f)
                  FORCE="y"
                  shift;;
              -y)
                  CONFIRM="y"
                  shift;;
  