anchor.diff:  
   mkDerivation rec {
     pname = "freecad";
  -  version = "0.19.1";
  +  version = "0.19.2";
   
     src = fetchFromGitHub {
       owner = "FreeCAD";
       repo = "FreeCAD";
       rev = version;
  -    hash = "sha256-itIrO+/mKXOPNs+2POKT8u4YZuqx/QAwVBWrHgKP1qQ=";
  +    hash = "sha256-XZ+fRl3CPCIFu3nHeMTLibwwFBlG/cWpKJlI58hTAuU=";
     };
   
     nativeBuildInputs = [
  
positive.code:       + ";${pyside2}/include/PySide2/QtCore"
        + ";${pyside2}/include/PySide2/QtWidgets"
        + ";${pyside2}/include/PySide2/QtGui"
        )
      "-DPYSIDE_LIBRARY=PySide2::pyside2"
    ];
  
  
negative.code:   ];
  
    cmakeFlags = [
      "-Wno-dev" # turns off warnings which otherwise makes it hard to see what is going on
      "-DBUILD_FLAT_MESH:BOOL=ON"
      "-DBUILD_QT5=ON"
      "-DSHIBOKEN_INCLUDE_DIR=${shiboken2}/include"
  