anchor.diff:  
     propagatedBuildInputs = [ menhir merlin_extend ppx_tools_versioned ];
   
  -  buildInputs = [ makeWrapper opam jbuilder utop menhir ];
  +  buildInputs = [ makeWrapper ocaml findlib jbuilder utop menhir ];
   
     buildFlags = [ "build" ]; # do not "make tests" before reason lib is installed
  -
  -  createFindlibDestdir = true;
   
     installPhase = ''
       for p in reason rtop
  
positive.code:     homepage = https://reasonml.github.io/;
      description = "Facebook's friendly syntax to OCaml";
      license = licenses.mit;
      maintainers = [ maintainers.volth ];
    };
  }
  
negative.code: { stdenv, makeWrapper, fetchFromGitHub, ocaml, findlib, jbuilder
  , menhir, merlin_extend, ppx_tools_versioned, utop
  }:
  
  stdenv.mkDerivation rec {
    name = "ocaml${ocaml.version}-reason-${version}";
    version = "3.3.3";
  
    src = fetchFromGitHub {
  