anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/gtk+/${ver_maj}/gtk+-${version}.tar.xz";
  -    sha256 = "1gpzlnfrifc17yfk0zki6b2vmsfpf5cmrbh232s6iaan11np44jd";
  +    sha256 = "1fkzdhqa1pjzb1qsh2ll3y2567ylyszks59qspx85lalvqa9ss0r";
     };
   
     nativeBuildInputs = [ pkgconfig gettext gobjectIntrospection perl ];
  
positive.code: 
      homepage = http://www.gtk.org/;
  
      license = stdenv.lib.licenses.lgpl2Plus;
  
      maintainers = with stdenv.lib.maintainers; [ urkud raskin vcunat lethalman ];
      platforms = stdenv.lib.platforms.all;
    };
  }
  
negative.code:     ''; # workaround for bug of nix-mode for Emacs */ '';
    };
  
    meta = with stdenv.lib; {
      description = "A multi-platform toolkit for creating graphical user interfaces";
  
      longDescription = ''
  