Compiling and Installing ROOT

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/ROOT
```
Run the following commands to decompress the ROOT installation package:
```
tar -xzvf root_v6.20.00.source.tar.gz
```
Run the following command to switch to the directory generated after the package is decompressed:
```
cd root-6.20.00
```
Run the following command to create and access the directory for compiling the ROOT software:
```
mkdir obj
cd obj
```
Ensure that the server is connected to the Internet and run the following commands to compile and install the software:
```
cmake ../ -DCMAKE_INSTALL_PREFIX=/opt/xrootd -DENABLE_PERL=FALSE
make -j16
make install
```
Run the following command to add the environment variables:
```
source ./bin/thisroot.sh
```

Parent topic: ROOT 6.20 Porting Guide (CentOS 7.6)