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Adding support of Geant4 with CLHEP enabled

BLONDEAU Pierre requested to merge Pierre.Blondeau/nptool:Pierre.Blondeau-NPTool.2.dev-patch-22662 into NPTool.2.dev

When compile NPSimulation with Geant4 that as CLHEP enabled we got this error :

[  9%] Building CXX object EventGenerator/CMakeFiles/NPSEventGenerator.dir/EventGeneratorBeam.cc.o
In file included from /opt/geant4-v11.1.3.1/install/include/Geant4/G4ParticleTable.hh:52,
                 from /home/paxman/Programs/nptoolv3/NPSimulation/EventGenerator/EventGeneratorBeam.cc:27:
/opt/geant4-v11.1.3.1/install/include/Geant4/G4ParticleDefinition.hh:46:10: fatal error: CLHEP/Units/PhysicalConstants.h: No such file or directory
   46 | #include <CLHEP/Units/PhysicalConstants.h>
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.

This is because CLHEP Includes aren't inside Geant4 directory. So, I add the directory of the included to solved the problem.

Regards

PS : Thank to John Frankland, Dominique Touchard, Charlie Paxman

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