anchor.diff:  
     prePatch = lib.optionalString stdenv.isAarch64 "ulimit -s 16384";
   
  -  inherit (topkg) buildPhase installPhase;
  +  buildPhase = ''
  +    runHook preBuild
  +    ${topkg.run} build \
  +      --with-uutf true \
  +      --with-cmdliner ${lib.boolToString cmdlinerSupport}
  +    runHook postBuild
  +  '';
  +
  +  inherit (topkg) installPhase;
   
     meta = with lib; {
       description = "An OCaml module for normalizing Unicode text";
  
positive.code: { lib, stdenv, fetchurl, ocaml, findlib, ocamlbuild, topkg, uchar, uutf, cmdliner }:
  let
    pname = "uunf";
    webpage = "https://erratique.ch/software/${pname}";
    version = "14.0.0";
  in
  
  if lib.versionOlder ocaml.version "4.03"
  
negative.code: 
    src = fetchurl {
      url = "${webpage}/releases/${pname}-${version}.tbz";
      sha256 = "sha256-B/prPAwfqS8ZPS3fyDDIzXWRbKofwOCyCfwvh9veuug=";
    };
  
    nativeBuildInputs = [ ocaml findlib ocamlbuild topkg ];
    buildInputs = [ topkg uutf ]
    ++ lib.optional cmdlinerSupport cmdliner;
  
    propagatedBuildInputs = [ uchar ];
  
  