Compiling and Installing UDUNITS

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/UDUNITS
```
Run the following command to decompress the package:
```
tar -zxvf udunits-2.2.28.tar.gz
```
Run the following command to switch to the directory generated after decompression:
```
cd udunits-2.2.28
```

Run the following command to perform configuration:

./configure --prefix=/path/to/UDUNITS CC=mpicc CXX=mpicxx FC=mpifort F77=mpifort

Run the following commands to perform compilation:
```
make -j 16
make install
```

Parent topic: UDUNITS 2.2.28 Porting Guide (CentOS 7.6)