Installing FFTW

Use PuTTY to log in to the server as the root user.
Run the following command to decompress the FFTW installation package:
```
tar -zxvf fftw-3.3.8.tar.gz
```
Run the following command to switch to the directory generated after the package is decompressed:
```
cd fftw-3.3.8
```

Run the following command to perform configuration:

./configure --prefix=/path/to/FFTW CC=gcc FC=gfortran F77=gfortran --enable-openmp --enable-threads --enable-threads --enable-shared=yes

Run the following commands to perform compilation and installation:
```
make -j
make install
```

Parent topic: Configuring the Compilation Environment