Compiling and Installing Geant4

Procedure

Use PuTTY to log in to the server as the root user.

Configure OpenGL.

yum install -y mesa*
yum install -y freeglut*
yum install -y *GLEW*
yum install -y openssl-devel

Switch to the DATA directory.
```
cd /path/to/DATA
```
Create a script for decompression.
1. Create a script.
```
vi run.sh
```
2. Press i to enter the insert mode and add the following content to decompress data packages in batches:
```
#!/bin/bash
for wav in ./*.tar.gz; do
      echo "Extracting wav from $wav"
      tar -xvf $wav
done
```
3. Press Esc, type :wq!, and press Enter to save the script and exit.
Add execution permissions for the script.
```
chmod +x run.sh
```
Decompress the data files.
```
sh run.sh
```

Set environment variables for data files.

Open data_source.
```
vi data_source
```

Press i to enter the insert mode and add the following content to set environment variables:

export G4SAIDXSDATA=/path/to/DATA/G4SAIDDATA2.0
export G4LEDATA=/path/to/DATA/G4EMLOW7.9.1
export G4LEVELGAMMADATA=/path/to/DATA/PhotonEvaporation5.5
export G4INCLDATA=/path/to/DATA/G4INCL1.0
export G4PARTICLEXSDATA=/path/to/DATA/G4PARTICLEXS2.1
export G4PIIDATA=/path/to/DATA/G4PII1.3
export G4RADIOACTIVEDATA=/path/to/DATA/RadioactiveDecay5.4
export G4REALSURFACEDATA=/path/to/DATA/RealSurface2.1.1
export G4ABLADATA=/path/to/DATA/G4ABLA3.1
export G4NEUTRONHPDATA=/path/to/DATA/G4NDL4.6
export G4ENSDFSTATEDATA=/path/to/DATA/G4ENSDFSTATE2.2
export G4TENDLDATA=/path/to/DATA/G4TENDL1.3.2

Press Esc, type :wq!, and press Enter to save the file and exit.

Run the following command to make the environment variables take effect:
```
source data_source
```
Decompress the Geant4 installation package.
```
tar -xvf geant4.10.06.p01.tar.gz
```

Create a build folder and switch to the folder.

mkdir geant4.10.06.p01/build
cd geant4.10.06.p01/build

Compile Geant4.

CC=mpicc CXX=mpicxx CFLAGS='-O3 -finline-functions -march=armv8.2-a -flto' cmake -DCMAKE_INSTALL_PREFIX=/path/to/GEANT4/geant4.10.06.p01-install -DGEANT4_USE_OPENGL_X11=ON -DGEANT4_BUILD_MULTITHREADED=ON ../

Run the following commands to install Geant4:
```
make -j16
make install
```

Switch to the parallel module directory.

cd /path/to/GEANT4/geant4.10.06.p01/examples/extended/parallel/MPI/source

Create a build directory and switch to the directory.
```
mkdir build
cd build
```

Compile the parallel module.

CC=mpicc CXX=mpicxx CFLAGS='-O3 -finline-functions -march=armv8.2-a -flto'  cmake -DCMAKE_INSTALL_PREFIX=/path/to/GEANT4/geant4.10.06.p01-install/lib64  ../

Install the parallel module.
```
make -j16
make install
```

Parent topic: Geant4 10.6 Porting Guide (CentOS 7.6)