Compilation and Installation

Use PuTTY to log in to the server as the root user.
Run the following command to go to the main program installation directory:
```
cd /path/to/ESPRESSOMD
```
Run the following command to decompress the installation package:
```
tar -xvf espresso-4.1.4.tar.gz
```
Run the following command to go to the directory generated after decompression:
```
cd espresso
```
Run the following commands to modify the cmake/FindFFTW3.cmake file:
1. Open the cmake/FindFFTW3.cmake file.
```
vi cmake/FindFFTW3.cmake
```
2. Press i to go to the edit mode. Add the following two lines before line 25:
```
SET(CMAKE_INCLUDE_PATH ${CMAKE_INCLUDE_PATH} "/path/to/FFTW/include")
SET(CMAKE_LIBRARY_PATH ${CMAKE_LIBRARY_PATH} "/path/to/FFTW/lib")
```
3. Press Esc, type :wq!, and press Enter to save the file and exit.
Create a build directory and build ESPResSo in the directory.
```
mkdir build
cd build
```
Run the following commands to build the software:
```
cmake ..
```
Run the following commands to modify the CMakeCache.txt file:
1. Open the CMakeCache.txt file.
```
vi CMakeCache.txt
```
2. Press i to go to the edit mode and add compilation options to line 37 of the CMakeCache.txt file.
```
CMAKE_CXX_FLAGS:STRING=-O3 -march=armv8.2-a -mcpu=tsv110 -Wl,-rpath=/path/to/KPGCC/gcc-9.3.1-2020.12-aarch64-linux/lib64/libhpc -L/path/to/KPGCC/gcc-9.3.1-2020.12-aarch64-linux/lib64/libhpc -lmathlib -lm
```
3. Press Esc, type :wq!, and press Enter to save the file and exit.

Run the following command to configure the environment variables of the mathlib library:

export LD_LIBRARY_PATH=/path/to/KPGCC/gcc-9.3.1-2020.12-aarch64-linux/lib64/libhpc:$LD_LIBRARY_PATH

Run the following commands to perform the compilation and installation:
```
make
```
After the compilation is successful, the EspressoCore.so dynamic library is generated in the /path/to/ESPRESSOMD/espresso/build/src/core directory. You can run the ldd command to list the dependencies of the dynamic library.

Parent topic: ESPResSo 4.1.4 Porting Guide (CentOS 7.6)