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--- a/CheckMATE-2.0.3/tools/fritz/include/pythiahandler/PythiaHandler.h +++ b/CheckMATE-2.0.3/tools/fritz/include/pythiahandler/PythiaHandler.h @@ -1,6 +1,7 @@ #ifndef _PYTHIAHANDLER #define _PYTHIAHANDLER +#include <cstddef> #include "Pythia8/Pythia.h" #ifdef HAVE_HEPMC