anchor.diff:    buildInputs = [
       SDL2
       curl
  +    duktape
       fontconfig
       freetype
       icu
       jansson
  +    libGLU
       libiconv
       libpng
       libpthreadstubs
       libzip
  -    libGLU
       openssl
       speexdsp
       zlib
  
positive.code: { stdenv, fetchFromGitHub,
    SDL2, cmake, curl, fontconfig, freetype, icu, jansson, libiconv, libpng,
    libpthreadstubs, libzip, libGLU, openssl, pkgconfig, speexdsp, zlib
  }:
  
  let
    version = "0.2.6";
  
    openrct2-src = fetchFromGitHub {
      owner = "OpenRCT2";
      repo = "OpenRCT2";
      rev = "v${version}";
      sha256 = "1vikbkg3wh5ngzdfilb6irbh6nqinf138qpdz8wz9izlvl8s36k4";
    };
  
    objects-src = fetchFromGitHub {
      owner = "OpenRCT2";
      repo = "objects";
      rev = "v1.0.14";
      sha256 = "1bqbia5y73v4r0sv5cvi5729jh2ns7cxn557blh715yxswk91590";
    };
  
    title-sequences-src = fetchFromGitHub {
  
negative.code: 
    postUnpack = ''
      cp -r ${objects-src}         $sourceRoot/data/object
      cp -r ${title-sequences-src} $sourceRoot/data/sequence
    '';
  
    cmakeFlags = [
  