anchor.diff:      sha256 = "0vzmlp83vnk4njcfkn03jcc1vkg2rf12zf5kj3p3a373xr4ds1zn";
     };
   
  -  python = python3.withPackages (pp: with pp; [
  -    nototools
  -  ]);
   in
   stdenv.mkDerivation rec {
     pname = "twitter-color-emoji";
     inherit version;
   
     srcs = [
  -    notoSrc
  +    noto-fonts-emoji.src
       twemojiSrc
     ];
   
  -  sourceRoot = notoSrc.name;
  +  sourceRoot = noto-fonts-emoji.src.name;
   
     postUnpack = ''
       chmod -R +w ${twemojiSrc.name}
  -    mv ${twemojiSrc.name} ${notoSrc.name}
  +    mv ${twemojiSrc.name} ${noto-fonts-emoji.src.name}
     '';
   
     nativeBuildInputs = [
  
positive.code: 
  { stdenv
  , fetchFromGitHub
  , cairo
  , graphicsmagick
  , pkg-config
  
negative.code: , python3
  , which
  , zopfli
  , noto-fonts-emoji
  }:
  
  let
    version = "12.1.2";
  
    twemojiSrc = fetchFromGitHub {
      name = "twemoji";
  