Do we want a Geant4 install with this?

[AndrewEdmonds11]

Do we want a geant4 install script like we do for ROOT in AlcapDAQ to ensure we are all using the same version of geant4?

Also, I guess tied into this is the fact that we should make sure we use the version of ROOT in AlcapDAQ

[AndrewEdmonds11]

So, something I'd seen when I installed g4sim last time was that for geant4.10, I had to add:

#include <CLHEP/Units/PhysicalConstants.h>
#include <CLHEP/Units/SystemOfUnits.h>
using namespace CLHEP;

to the files in src/.

In my paper notes I had written: -> Have a sed command to do this. Luckily, I hadn't deleted my old g4sim folder (I remember considering it) and managed to find it.

The command is this (don't ask me to translate):

sed -i '0,/.hh\"/{s/.hh\"/.hh\"\n\n#include <CLHEP\/Units\/PhysicalConstants.h>\n#include <CLHEP\/Units\/SystemOfUnits.h>\nusing namespace CLHEP;/}' *

I won't commit this change in case we decide that we don't want a common Geant4 install or we decide on installing an older (and possibly more stable) version but I'm leaving it here just in case.

[wuchen1106]

Tested and worked well! Here's another solution:

1. change globals.hh to myglobals.hh
2. create myglobals.hh in include/
3. Add 3 lines to myglobals.hh

#include "globals.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh

Then it can work with geant4.9 and geant4.10. Shall I commit?

[AndrewEdmonds11]

Yes, please do.

[wuchen1106]

Done. Still, do we need a script to install?

[AndrewEdmonds11]

I'm not sure. I guess we should discuss this in the meeting

[AndrewEdmonds11]

An install-geant4.sh script has been added.