anchor.diff:  {
  -stdenv, fetchFromGitHub, cmake
  +stdenv, fetchFromGitHub, cmake, makeWrapper
   ,qtbase, qttools, python, libGLU_combined
   ,libXt, qtx11extras, qtxmlpatterns
   }:
  
positive.code:     fetchSubmodules = true;
    };
  
     cmakeFlags = [
       "-DPARAVIEW_ENABLE_PYTHON=ON"
       "-DPARAVIEW_INSTALL_DEVELOPMENT_FILES=ON"
       "-DPARAVIEW_ENABLE_EMBEDDED_DOCUMENTATION=OFF"
     ];
  
    # During build, binaries are called that rely on freshly built
    # libraries.  These reside in build/lib, and are not found by
  
negative.code: 
    nativeBuildInputs = [
      cmake
      makeWrapper
    ];
  
    buildInputs = [
      python
      python.pkgs.numpy
      libGLU_combined
      libXt
      qtbase
  