anchor.diff:      url = "mirror://sourceforge/fillets/fillets-ng-data-${version}.tar.gz";
       sha256 = "169p0yqh2gxvhdilvjc2ld8aap7lv2nhkhkg4i1hlmgc6pxpkjgh";
     };
  -  nativeBuildInputs = [ pkgconfig copyDesktopItems ];
  -  buildInputs = [SDL lua5_1 SDL_mixer SDL_image SDL_ttf];
  +
  +  nativeBuildInputs = [ pkg-config copyDesktopItems ];
  +  buildInputs = [ SDL lua5_1 SDL_mixer SDL_image SDL_ttf ];
  +
     desktopItems = [ (makeDesktopItem {
       name = "fish-fillets-ng";
       exec = "fillets";
  
positive.code:     comment     = "Puzzle game about witty fish saving the world sokoban-style";
      categories  = "Game;LogicGame;";
    }) ];
    postInstall=''
      # Install game data
      mkdir -p "$out/share/games/fillets-ng/"
      tar -xf ${data} -C "$out/share/games/fillets-ng/" --strip-components=1
      
      # Install game icon
      install -Dm644 ${./icon.xpm} $out/share/pixmaps/fish-fillets-ng.xpm
    '';
    meta = {
      inherit version;
      description = ''A puzzle game'';
      license = stdenv.lib.licenses.gpl2Plus;
      maintainers = [stdenv.lib.maintainers.raskin];
      platforms = stdenv.lib.platforms.linux;
      homepage = "http://fillets.sourceforge.net/";
    };
  }
  
negative.code: { lib, stdenv, fetchurl, makeDesktopItem, copyDesktopItems, SDL, lua5_1, pkg-config, SDL_mixer, SDL_image, SDL_ttf }:
  
  stdenv.mkDerivation rec {
    pname = "fish-fillets-ng";
    version = "1.0.1";
  
    src = fetchurl {
      url = "mirror://sourceforge/fillets/fillets-ng-${version}.tar.gz";
      sha256 = "1nljp75aqqb35qq3x7abhs2kp69vjcj0h1vxcpdyn2yn2nalv6ij";
  