anchor.diff:  
     meta = with stdenv.lib; {
       description = "Flat theme with transparent elements for GTK 3, GTK 2 and Gnome Shell";
  -    homepage    = "https://github.com/arc-design/arc-theme";
  +    homepage    = "https://github.com/jnsh/arc-theme";
       license     = licenses.gpl3;
       maintainers = with maintainers; [ simonvandel romildo ];
       platforms   = platforms.linux;
  -    broken = true; # since libsass 3.6.3
     };
   }
  
positive.code: 
    configureFlags = [
      "--disable-gnome-shell" # 3.36 not supported
      "--disable-unity"
    ];
  
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "arc-theme";
    version = "20200416";
  
    src = fetchFromGitHub {
      owner  = "jnsh";
      repo   = pname;
      rev    = "0779e1ca84141d8b443cf3e60b85307a145169b6";
      sha256 = "1ddyi8g4rkd4mxadjvl66wc0lxpa4qdr98nbbhm5abaqfs2yldd4";
    };
  
    nativeBuildInputs = [
  