anchor.diff:  assert stdenv.lib.versionAtLeast ocamlVersion "3.11";
   
   stdenv.mkDerivation {
  -  name = "ocaml-reactiveData-0.1";
  +  name = "ocaml-reactiveData-0.2";
     src = fetchurl {
  -    url = https://github.com/hhugo/reactiveData/archive/0.1.tar.gz;
  -    sha256 = "056y9in6j6rpggdf8apailvs1m30wxizpyyrj08xyfxgv91mhxgw";
  +    url = https://github.com/ocsigen/reactiveData/archive/0.2.tar.gz;
  +    sha256 = "0rskcxnyjn8sxqnncdm6rh9wm99nha5m5sc83fywgzs64xfl43fq";
     };
   
  -  buildInputs = [ocaml findlib opam];
  +  buildInputs = [ocaml findlib opam camlp4 ];
     propagatedBuildInputs = [ocaml_react];
   
     buildPhase = "ocaml pkg/build.ml native=true native-dynlink=true";
  
positive.code: 
    meta = with stdenv.lib; {
      description = "An OCaml module for functional reactive programming (FRP) based on React";
      homepage = https://github.com/hhugo/reactiveData;
      license = licenses.lgpl21;
      platforms = ocaml.meta.platforms or [];
      maintainers = with maintainers; [ vbgl ];
  
negative.code: {stdenv, fetchurl, ocaml, findlib, ocaml_react, camlp4, opam}:
  
  let
    ocamlVersion = stdenv.lib.getVersion ocaml;
  