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