anchor.diff:  
     src = openrct2-src;
   
  +  nativeBuildInputs = [
  +    cmake
  +    pkgconfig
  +  ];
  +
     buildInputs = [
       SDL2
  -    cmake
       curl
       fontconfig
       freetype
  
positive.code: 
  let
    name = "openrct2-${version}";
    version = "0.2.3";
  
    openrct2-src = fetchFromGitHub {
      owner = "OpenRCT2";
      repo = "OpenRCT2";
      rev = "v${version}";
      sha256 = "01mj6jlbl2cn3wpk6sy34ldzdl0qykpn7fncznjykklj2nqzr4ig";
    };
  
    objects-src = fetchFromGitHub {
      owner = "OpenRCT2";
      repo = "objects";
      rev = "v1.0.11";
      sha256 = "1bh7mngpqnhzwnhhawq5y3a6hbvwxis2yagk4dcmc4w1fifq2y66";
    };
  
    title-sequences-src = fetchFromGitHub {
      owner = "OpenRCT2";
      repo = "title-sequences";
      rev = "v0.1.2";
      sha256 = "1yb1ynkfmiankii3fngr9km5wbc07rp30nh0apkj6wryrhy7imgm";
    };
  in
  stdenv.mkDerivation {
  
negative.code:     libzip
      libGLU
      openssl
      speexdsp
      zlib
    ];
  