anchor.diff:  { stdenv, lib, fetchFromGitHub, ocaml, findlib }:
  -let
  -  pname = "xml-light";
  +
  +stdenv.mkDerivation rec {
  +  pname = "ocaml${ocaml.version}-xml-light";
     version = "2.4";
  -in
  -stdenv.mkDerivation {
  -  name = "ocaml-${pname}-${version}";
   
     src = fetchFromGitHub {
       owner = "ncannasse";
  
positive.code:     homepage = "http://tech.motion-twin.com/xmllight.html";
      license = lib.licenses.lgpl21;
      maintainers = [ lib.maintainers.romildo ];
      platforms = ocaml.meta.platforms or [ ];
    };
  }
  
negative.code: 
    createFindlibDestdir = true;
  
    installPhase = ''
      runHook preInstall
      make install_ocamlfind
      mkdir -p $out/share
      cp -vai doc $out/share/
      runHook postInstall
    '';
  
    meta = {
  