anchor.diff:  
     src = fetchurl {
       url = "${webpage}/releases/${pname}-${version}.tbz";
  -    sha256 = "sha256:17wv0nm3vvwcbzb1b09akw8jblmigyhbfmh1sy9lkb5756ni94a2";
  +    sha256 = "sha256-B/prPAwfqS8ZPS3fyDDIzXWRbKofwOCyCfwvh9veuug=";
     };
   
     nativeBuildInputs = [ ocaml findlib ocamlbuild topkg ];
  -  buildInputs = [ topkg uutf cmdliner ];
  +  buildInputs = [ topkg uutf ]
  +  ++ lib.optional cmdlinerSupport cmdliner;
   
     propagatedBuildInputs = [ uchar ];
   
  
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: 
    prePatch = lib.optionalString stdenv.isAarch64 "ulimit -s 16384";
  
    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";
  