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1. Return to the work dir, create a Geant4 subdir and go into it.

   No Format
   cd $sim_work mkdir geant4 cd geant4

2. Download the Geant4 tarball.

   No Format
   wget http://geant4.cern.ch/geant4/source/source/geant4.7.1.tar.gz

3. Unzip it.

   No Format
   tar -zxvf geant4.7.1.tar.gz

4. Set the following variables in setup.sh. (You should not need to run Geant4's Configure script.)

   No Format
   export G4INSTALL=${sim_work}/geant4/geant4.7.1 export G4SYSTEM=WIN32-g++

5. Go into the Geant4 base dir.

   No Format
   cd geant4.7.1

6. LCPhys requires that a special flag is set in order to use the latest Kaon model. At the end of config/architecture.gmk, insert the following line exactly as it appears below:

   No Format
   CPPFLAGS += -DG4BERTINI_KAON

   Hopefully, this hack will be remedied soon!
7. Now for another lovely Geant4 hack. In order to use visualization, replace successfully compile the HepRep driver, the following line in the file config/sys/WIN32-g++.gmk

   No Format
   CXXFLAGS := -Wall -ansi -pedantic -pipe

   should be replaced with

   No Format
   CXXFLAGS := -W -Wall -ansi -pedantic -Wno-non-virtual-dtor -Wno-long-long CXXFLAGS += -Wwrite-strings -Wpointer-arith -Woverloaded-virtual -pipe

8. Build the libraries, which will be placed at $G4INSTALL/lib/WIN32-g++. (This could take up to a few hours depending on your machine.)

   No Format
   cd source make

9. Install the headers into $G4INSTALL/include.

   No Format
   make includes

10. Build the physics list libraries. These will go into $G4INSTALL/lib/plists/WIN32-g++.

    No Format
    cd ../physics_lists/hadronic make

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