anchor.diff:    '';
   
     nativeBuildInputs = [
  +    gobject-introspection
       wrapGAppsHook
     ];
   
     buildInputs = [
       gdk-pixbuf
  -    gobject-introspection
       librsvg
       poppler_gi
     ];
  
positive.code:     owner = "jvoisin";
      repo = "mat2";
      rev = version;
      hash = "sha256-HjPr4pb0x2Sdq8ALaZeQRnGHmNAoEV8XUGbhOjY00jc=";
    };
  
    patches = [
  
negative.code: 
  buildPythonPackage rec {
    pname = "mat2";
    version = "0.13.0";
  
    disabled = pythonOlder "3.5";
  
  