anchor.diff: -{ stdenv, lib, fetchFromGitHub }:
  +{ stdenv, lib, jekyll, fetchFromGitHub }:
   
   stdenv.mkDerivation rec {
     pname = "jsonnet";
     version = "0.17.0";
  +  outputs = ["out" "doc"];
   
     src = fetchFromGitHub {
       rev = "v${version}";
  
positive.code:     "libjsonnet.so"
    ];
  
    installPhase = ''
      mkdir -p $out/bin $out/lib $out/include
      cp jsonnet $out/bin/
      cp jsonnetfmt $out/bin/
      cp libjsonnet*.so $out/lib/
      cp -a include/*.h $out/include/
    '';
  
    meta = {
  
negative.code:     repo = "jsonnet";
      sha256 = "1ddz14699v5lqx3dh0mb7hfffr6fk5zhmzn3z8yxkqqvriqnciim";
    };
  
    nativeBuildInputs = [ jekyll ];
  
    enableParallelBuilding = true;
  
  