anchor.diff:    numix-gtk-theme = callPackage ../misc/themes/gtk3/numix-gtk-theme { };
   
     plasma52 = recurseIntoAttrs (callPackage ../desktops/plasma-5.2 {
  -    qt5 = qt54;
       kf5 = kf57;
     });
     plasma5_latest = plasma52;
  
positive.code:     client = false;
      withKDE = false;
      useQt5 = true;
      qt = qt54;
      dconf = gnome3.dconf;
      tag = "-qt5";
    };
  
negative.code: 
    polkit_qt5 = callPackage ../development/libraries/polkit-qt-1 {
      withQt5 = true;
      inherit qt5;
    };
  
    policykit = callPackage ../development/libraries/policykit { };
  