anchor.diff:  
   { stdenv
   , fetchFromGitHub
  +, fetchpatch
   , cairo
   , graphicsmagick
   , pkg-config
  
positive.code:     graphicsmagick
      pkg-config
      pngquant
      python
      which
      zopfli
    ];
  
    patches = [
      # Port to python3
      (fetchpatch {
        url = "https://src.fedoraproject.org/rpms/twitter-twemoji-fonts/raw/3bc176c10ced2824fe03da5ff561e22a36bf8ccd/f/noto-emoji-port-to-python3.patch";
        sha256 = "1b91abd050phxlxq7322i74nkx16fkhpw14yh97r2j4c7fqarr2q";
      })
      (fetchpatch {
        url = "https://src.fedoraproject.org/rpms/twitter-twemoji-fonts/raw/3bc176c10ced2824fe03da5ff561e22a36bf8ccd/f/noto-emoji-python3.patch";
        sha256 = "0mw2c748izb6h9a19jwc0qxlb6l1kj6k8gc345lpf7lfcxfl7l59";
      })
      (fetchpatch {
        url = "https://src.fedoraproject.org/rpms/twitter-twemoji-fonts/raw/3bc176c10ced2824fe03da5ff561e22a36bf8ccd/f/noto-emoji-use-gm.patch";
        sha256 = "0yfmfzaaiq5163c06172g4r734aysiqyv1s28siv642vqzsqh4i2";
  
negative.code:     sha256 = "0vzmlp83vnk4njcfkn03jcc1vkg2rf12zf5kj3p3a373xr4ds1zn";
    };
  
  in
  stdenv.mkDerivation rec {
    pname = "twitter-color-emoji";
    inherit version;
  
    srcs = [
      noto-fonts-emoji.src
      twemojiSrc
    ];
  
    sourceRoot = noto-fonts-emoji.src.name;
  
    postUnpack = ''
      chmod -R +w ${twemojiSrc.name}
      mv ${twemojiSrc.name} ${noto-fonts-emoji.src.name}
    '';
  
    nativeBuildInputs = [
  