anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "arc-theme";
  -  version = "20190917";
  +  version = "20200416";
   
     src = fetchFromGitHub {
  -    owner  = "arc-design";
  +    owner  = "jnsh";
       repo   = pname;
  -    rev    = version;
  -    sha256 = "1qgpk4p2hi5hd4yy0hj93kq1vs0b32wb8qkaj1wi90c8gwddq5wa";
  +    rev    = "0779e1ca84141d8b443cf3e60b85307a145169b6";
  +    sha256 = "1ddyi8g4rkd4mxadjvl66wc0lxpa4qdr98nbbhm5abaqfs2yldd4";
     };
   
     nativeBuildInputs = [
  
positive.code: 
    configureFlags = [
      "--disable-gnome-shell" # 3.36 not supported
      "--disable-unity"
    ];
  
  
negative.code: 
    meta = with stdenv.lib; {
      description = "Flat theme with transparent elements for GTK 3, GTK 2 and Gnome Shell";
      homepage    = "https://github.com/jnsh/arc-theme";
      license     = licenses.gpl3;
      maintainers = with maintainers; [ simonvandel romildo ];
      platforms   = platforms.linux;
    };
  }
  