Remove the CLHEP_HepMC.h as it contains non-existing include files
Remove the CLHEP_HepMC.h as it contains non-existing include files
#include "CLHEP/HepMC/Flow.h"
#include "CLHEP/HepMC/GenEvent.h"
#include "CLHEP/HepMC/GenEventConvert.h"
#include "CLHEP/HepMC/GenParticle.h"
#include "CLHEP/HepMC/GenVertex.h"
#include "CLHEP/HepMC/Polarization.h"
#include "CLHEP/HepMC/WeightContainer.h"
Those were removed from CLHEP before the version 2.0, I think
Tag @jchapman