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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++

   If you would like to enable OpenGL visualization, add the following variable definitions.
   This assumes you installed the X11 libraries when you set up cygwin.

   No Format
   export OGLHOME=/usr/X11R6 export G4VIS_BUILD_OPENGLX_DRIVER=1 export G4VIS_USE_OPENGLX=1

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 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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The final version of setup.sh (without OpenGL visualization) should be similar to this.

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