anchor.diff:  }
   
   function unpack_payload(){
  -    if $FORCE || [ ! "$(ls -A $INSTALL_DIR)" ] ; then
  +    if [ "$FORCE" == "1" ] || [ ! "$(ls -A $INSTALL_DIR)" ] ; then
           log "Unpacking payload . . ."
           local archive_line=$(grep -a -n -m1 '__ARCHIVE__$' $0 | sed 's/:.*//')
           tail -n +$((archive_line + 1)) $0 | tar -C $INSTALL_DIR -xf - > /dev/null || die "Failed to unpack payload from the end of '$0' into '$INSTALL_DIR'"
  
positive.code:     if [ -r $AFTER_INSTALL ] ; then
          chmod +x $AFTER_INSTALL
          log "Running post install script"
          $AFTER_INSTALL
          return $?
      fi
      return 0
  
negative.code:                 export VERBOSE=1
                  shift;;
              -u)
                  UNPACK_ONLY=1
                  shift;;
              -f)
                  FORCE=1
                  shift;;
              -y)
                  CONFIRM="y"
  