anchor.diff:      homepage = "http://tech.motion-twin.com/xmllight.html";
       license = lib.licenses.lgpl21;
       maintainers = [ lib.maintainers.romildo ];
  -    platforms = ocaml.meta.platforms or [];
  +    platforms = ocaml.meta.platforms or [ ];
     };
   }
  
positive.code: {stdenv, lib, fetchurl, ocaml, findlib}:
  let
    pname = "xml-light";
    version = "2.4";
  
negative.code: stdenv.mkDerivation {
    name = "ocaml-${pname}-${version}";
  
    src = fetchFromGitHub {
      owner = "ncannasse";
      repo = "xml-light";
      rev = version;
      sha256 = "sha256-2txmkl/ZN5RGaLQJmr+orqwB4CbFk2RpLJd4gr7kPiE=";
    };
  
    buildInputs = [ ocaml findlib ];
  