anchor.diff:  
     propagatedBuildInputs = [ clhep expat xercesc zlib libGL ]
       ++ lib.optionals enableXM [ motif ]
  -    ++ lib.optionals enableQT [ qtbase ];
  +    ++ lib.optionals enableQt [ qtbase ];
   
     postFixup = ''
       # Don't try to export invalid environment variables.
       sed -i 's/export G4\([A-Z]*\)DATA/#export G4\1DATA/' "$out"/bin/geant4.sh
  -  '' + lib.optionalString enableQT ''
  +  '' + lib.optionalString enableQt ''
       wrapQtAppsHook
     '';
   
  
positive.code:   boost_python = boost.override { enablePython = true; python = python3; };
  in
  
  stdenv.mkDerivation rec {
    version = "11.0.0";
    pname = "geant4";
  
negative.code: 
    nativeBuildInputs =  [
      cmake
    ] ++ lib.optionals enableQt [
      wrapQtAppsHook
    ];
  
    dontWrapQtApps = !enableQt;
  
    buildInputs = [ libGLU xlibsWrapper libXmu ]
      ++ lib.optionals enableInventor [ libXpm coin3d soxt motif ]
  