anchor.diff:    isQtStyle = cfg.platformTheme == "gtk2" && !(builtins.elem cfg.style ["adwaita" "adwaita-dark"]);
     isQt5ct = cfg.platformTheme == "qt5ct";
     isLxqt = cfg.platformTheme == "lxqt";
  +  isKde = cfg.platformTheme == "kde";
   
     packages = if isQGnome then [ pkgs.qgnomeplatform pkgs.adwaita-qt ]
       else if isQtStyle then [ pkgs.libsForQt5.qtstyleplugins ]
       else if isQt5ct then [ pkgs.libsForQt5.qt5ct ]
       else if isLxqt then [ pkgs.lxqt.lxqt-qtplugin pkgs.lxqt.lxqt-config ]
  +    else if isKde then [ pkgs.libsForQt5.plasma-integration pkgs.libsForQt5.systemsettings ]
       else throw "`qt5.platformTheme` ${cfg.platformTheme} and `qt5.style` ${cfg.style} are not compatible.";
   
   in
  
positive.code:           "gnome"
            "lxqt"
            "qt5ct"
          ];
          example = "gnome";
          relatedPackages = [
  
negative.code:                 <link xlink:href="https://sourceforge.net/projects/qt5ct/">qt5ct</link>
                  application.
                </para></listitem>
              </varlistentry>
              <varlistentry>
                <term><literal>kde</literal></term>
                <listitem><para>Use Qt settings from Plasma.</para></listitem>
              </varlistentry>
            </variablelist>
          '';
  