anchor.diff:      owner = "liblouis";
       repo = "liblouis";
       rev = "v${version}";
  -    sha256 = "0klmyh6cg9khv59j4xdsrwwjzdgylw689gvrjiy5jsvqll58fcsd";
  +    sha256 = "11vq9rnmrfqka3fiyrxs0q1gpvpj4m9jmrkwd1yvrq94fndgvh1m";
     };
   
     outputs = [ "out" "dev" "man" "info" "doc" ];
  
positive.code: }:
  
  let
    version = "3.5.0";
  in stdenv.mkDerivation rec {
    name = "liblouis-${version}";
  
  
negative.code:   meta = with stdenv.lib; {
      description = "Open-source braille translator and back-translator";
      homepage = http://liblouis.org/;
      license = licenses.lgpl21;
      maintainers = with maintainers; [ jtojnar ];
      platforms = platforms.unix;
  