anchor.diff: -{ stdenv, fetchzip, which, cryptopp, ocaml, findlib, ocamlbuild, camlp4
  +{ stdenv, buildOcaml, fetchzip, which, cryptopp, ocaml, findlib, ocamlbuild, camlp4
   , ocaml_react, ocaml_ssl, libev, pkgconfig, ncurses, ocaml_oasis, glib
   , ppx_tools, result, cppo
   , ppxSupport ? stdenv.lib.versionAtLeast ocaml.version "4.02"
  
positive.code: 
    createFindlibDestdir = true;
  
    meta = with stdenv.lib; {
      homepage = http://ocsigen.org/lwt;
      description = "Lightweight thread library for Objective Caml";
  
negative.code:   };
  in
  
  buildOcaml rec {
    name = "lwt";
    inherit (param) version;
  
    src = fetchzip {
  