anchor.diff: -{stdenv, fetchurl, ocaml, findlib, ocaml_data_notation, ocaml_typeconv,
  +{stdenv, fetchurl, ocaml, findlib, ocaml_data_notation, ocaml_typeconv, camlp4,
    ocamlmod, ocamlify, ounit, expect}:
   
   stdenv.mkDerivation {
  
positive.code: 
    buildInputs =
      [
        ocaml findlib ocaml_typeconv ocamlmod ocamlify ounit
      ];
  
    propagatedBuildInputs = [ ocaml_data_notation ];
  
negative.code:   buildPhase     = "ocaml setup.ml -build";
    installPhase   = "ocaml setup.ml -install";
  
    meta = with stdenv.lib; {
      homepage = http://oasis.forge.ocamlcore.org/;
      description = "Configure, build and install system for OCaml projects";
      license = licenses.lgpl21;
      platforms = ocaml.meta.platforms;
      maintainers = with maintainers; [
        vbgl z77z
      ];
    };
  }
  