anchor.diff: -{ stdenv, fetchzip, ocaml, findlib, cppo, easy-format, biniou }:
  +{ stdenv, fetchzip, ocaml, findlib, jbuilder, cppo, easy-format, biniou }:
   let
     pname = "yojson";
     param =
  -  if stdenv.lib.versionAtLeast ocaml.version "4.01" then {
  -    version = "1.3.3";
  -    sha256 = "02l11facbr6bxrxq95vrcp1dxapp02kv7g4gq8rm62pb3dj5c6g7";
  +  if stdenv.lib.versionAtLeast ocaml.version "4.02" then {
  +    version = "1.4.0";
  +    sha256 = "0rzn4yihfi0psd2qmgrx5fvwpby87sqx4zws3ijf49f7wbpycccv";
  +    buildInputs = [ jbuilder ];
  +    extra = { inherit (jbuilder) installPhase; };
     } else {
       version = "1.2.3";
       sha256 = "10dvkndgwanvw4agbjln7kgb1n9s6lii7jw82kwxczl5rd1sgmvl";
  +    buildInputs = [];
  +    extra = {
  +      createFindlibDestdir = true;
  +
  +      makeFlags = "PREFIX=$(out)";
  +
  +      preBuild = "mkdir $out/bin";
  +    };
     };
   in
  -stdenv.mkDerivation {
  +stdenv.mkDerivation ({
   
     name = "ocaml${ocaml.version}-${pname}-${param.version}";
   
  
positive.code:     maintainers = [ maintainers.vbgl ];
      platforms = ocaml.meta.platforms or [];
    };
  }
  
negative.code:     inherit (param) sha256;
    };
  
    buildInputs = [ ocaml findlib ] ++ param.buildInputs;
  
    propagatedBuildInputs = [ cppo easy-format biniou ];
  
    meta = with stdenv.lib; {
      description = "An optimized parsing and printing library for the JSON format";
  