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