anchor.diff:      (enableFeature enablePython2Library "python-library")
       (enableFeature enablePython2Library "python2") # XXX: python2 library does not work anyway
       (enableFeature enableUI "ui")
  -    "--with-unicode-emoji-dir=${emojiData}"
  -    "--with-emoji-annotation-dir=${cldrEmojiAnnotation}/share/unicode/cldr/common/annotations"
  -    "--with-ucd-dir=${ucd}"
  +    "--with-unicode-emoji-dir=${unicode-emoji}/share/unicode/emoji"
  +    "--with-emoji-annotation-dir=${cldr-emoji-annotation}/share/unicode/cldr/common/annotations"
  +    "--with-ucd-dir=${unicode-character-database}/share/unicode"
     ];
   
     nativeBuildInputs = [
  
positive.code: with stdenv.lib;
  
  let
    emojiSrcs = {
      data = fetchurl {
        url = "http://unicode.org/Public/emoji/5.0/emoji-data.txt";
        sha256 = "11jfz5rrvyc2ixliqfcjgmch4cn9mfy0x96qnpfcyz5fy1jvfyxf";
      };
      sequences = fetchurl {
        url = "http://unicode.org/Public/emoji/5.0/emoji-sequences.txt";
        sha256 = "09bii7f5mmladg0kl3n80fa9qaix6bv5ylm92x52j7wygzv0szb1";
      };
      variation-sequences = fetchurl {
        url = "http://unicode.org/Public/emoji/5.0/emoji-variation-sequences.txt";
        sha256 = "1wlg4gbq7spmpppjfy5zdl82sj0hc836p8gljgfrjmwsjgybq286";
      };
      zwj-sequences = fetchurl {
        url = "http://unicode.org/Public/emoji/5.0/emoji-zwj-sequences.txt";
        sha256 = "16gvzv76mjv9g81lm1m6cr3rpfqyn2k4hb9a62xd329252dhl25q";
      };
      test = fetchurl {
        url = "http://unicode.org/Public/emoji/5.0/emoji-test.txt";
        sha256 = "031qk2v8xdnba7hfinmgrmpglc9l8ll2hds6mw885p0hngdb3dgw";
      };
    };
    emojiData = stdenv.mkDerivation {
      name = "emoji-data-5.0";
      dontUnpack = true;
      installPhase = ''
        mkdir $out
        ${builtins.toString (flip mapAttrsToList emojiSrcs (k: v: "cp ${v} $out/emoji-${k}.txt;"))}
      '';
    };
    cldrEmojiAnnotation = stdenv.mkDerivation rec {
      pname = "cldr-emoji-annotation";
      version = "31.90.0_1";
      src = fetchFromGitHub {
        owner = "fujiwarat";
        repo = "cldr-emoji-annotation";
        rev = version;
        sha256 = "1vsj32bg8ab4d80rz0fxy6sj2lv31inzyjnddjm079bnvlaf2kih";
      };
      nativeBuildInputs = [ autoreconfHook ];
    };
    ucdVersion = "12.0.0";
    ucdSrcs = {
      NamesList = fetchurl {
        url = "https://www.unicode.org/Public/${ucdVersion}/ucd/NamesList.txt";
        sha256 = "c17c7726f562bd9ef869096807f0297e1edef9a58fdae1fbae487378fa43586f";
      };
      Blocks = fetchurl {
        url = "https://www.unicode.org/Public/${ucdVersion}/ucd/Blocks.txt";
        sha256 = "a1a3ca4381eb91f7b65afe7cb7df615cdcf67993fef4b486585f66b349993a10";
      };
    };
    ucd = stdenv.mkDerivation {
      name = "ucd-${ucdVersion}";
      dontUnpack = true;
      installPhase = ''
        mkdir $out
        ${builtins.toString (flip mapAttrsToList ucdSrcs (k: v: "cp ${v} $out/${k}.txt;"))}
      '';
    };
    python3Runtime = python3.withPackages (ps: with ps; [ pygobject3 ]);
    python3BuildEnv = python3.buildEnv.override {
      # ImportError: No module named site
  
negative.code: , gtk3
  , gtk-doc
  , isocodes
  , cldr-emoji-annotation
  , unicode-character-database
  , unicode-emoji
  , python3
  , json-glib
  , libnotify ? null
  