anchor.diff: -{stdenv, fetchurl, ocaml, findlib, ocaml_typeconv, ounit}:
  +{stdenv, fetchurl, ocaml, findlib, ocaml_typeconv, ounit, camlp4}:
   
   stdenv.mkDerivation {
     name = "ocaml-data-notation-0.0.11";
  
positive.code:     sha256 = "09a8zdyifpc2nl4hdvg9206142y31cq95ajgij011s1qcg3z93lj";
    };
  
    buildInputs = [ocaml findlib ocaml_typeconv ounit];
  
    createFindlibDestdir = true;
  
  
negative.code:   buildPhase     = "ocaml setup.ml -build";
    installPhase   = "ocaml setup.ml -install";
  
    meta = with stdenv.lib; {
      description = "Store data using OCaml notation";
      homepage = https://forge.ocamlcore.org/projects/odn/;
      license = licenses.lgpl21;
      platforms = ocaml.meta.platforms;
      maintainers = with maintainers; [
        vbgl z77z
      ];
    };
  }
  