anchor.diff:      # but brings high DPI support?
       else wxGTK31.override { withGtk2 = false; };
   
  -  pythonPackages = python.pkgs;
     python = python3;
  -  wxPython = pythonPackages.wxPython_4_0;
  +  wxPython = python.pkgs.wxPython_4_0;
   
   in
   stdenv.mkDerivation rec {
  
positive.code: , oceSupport ? false, opencascade
  , withOCCT ? true, opencascade-occt
  , ngspiceSupport ? true, libngspice
  , scriptingSupport ? true, swig, python3
  , debug ? false, valgrind
  , with3d ? true
  , withI18n ? true
  
negative.code:   dontFixup = true;
  
    pythonPath = optionals (scriptingSupport)
      [ wxPython python.pkgs.six ];
  
    nativeBuildInputs = [ makeWrapper ]
      ++ optionals (scriptingSupport)
        [ python.pkgs.wrapPython ];
  
    # wrapGAppsHook added the equivalent to ${base}/share
    # though i noticed no difference without it
  