anchor.diff:  , gtk-engine-murrine
   , gdk-pixbuf
   , librsvg
  +, python3
   }:
   
   stdenv.mkDerivation rec {
     pname = "pop-gtk-theme";
  -  version = "2020-02-10";
  +  version = "2020-04-22";
   
     src = fetchFromGitHub {
       owner = "pop-os";
       repo = "gtk-theme";
  -    rev = "ed888e9dd5de142cb899e362beedaf694594cc7e";
  -    sha256 = "0ryr1jx9pzij6pkv7sam07f90w5lbrzx0fj5vdxl94612mh76aad";
  +    rev = "b3f98dfd61cfff81f69cdc7f57bce7a9efaa36f4";
  +    sha256 = "0vhcc694x33sgcpbqkrc5bycbd7017k4iii0mjjxgd22jd5lzgkb";
     };
   
     nativeBuildInputs = [
  
positive.code:     gtk3
      inkscape
      optipng
    ];
  
    buildInputs = [
  
negative.code:   ];
  
    postPatch = ''
      patchShebangs .
  
      for file in $(find -name render-\*.sh); do
        substituteInPlace "$file" \
          --replace 'INKSCAPE="/usr/bin/inkscape"' \
                    'INKSCAPE="inkscape"' \
  