anchor.diff:  
     src = fetchurl {
       url = "http://downloads.sourceforge.net/project/instead/instead/${version}/instead_${version}.tar.gz";
  -    sha256 = "f5577c5118b5f4a2897c7bb26f3ad7993005dbf0ae8fe762b4434e1151ddb430";
  +    sha256 = "0szg8ns9k8d85ap8cdd3mgxgldry369kxfj6wp1nc3a73pw4gghv";
     };
   
     NIX_LDFLAGS = "-llua -lgcc_s";
  
positive.code: { stdenv, fetchurl, SDL, SDL_ttf, SDL_image, SDL_mixer, pkgconfig, lua, zlib, unzip }:
  
  let
    version = "1.9.1";
  
    # I took several games at random from http://instead.syscall.ru/games/
    games = [
  
negative.code:     popd
    '';
  
    meta = with stdenv.lib; {
      description = "Simple text adventure interpreter for Unix and Windows";
      homepage = http://instead.syscall.ru/;
      license = stdenv.lib.licenses.gpl2;
      platforms = with stdenv.lib.platforms; linux;
      maintainers = with maintainers; [ pSub ];
    };
  }
  