# This uses 3 build processes, you need 2GB of RAM for each.
./build.sh -j3
```
### Building On Ubuntu 16.04 and older systems
### Building On Ubuntu 16.04 and older systems
Some older compilers may not be able to compile modern code, such as gcc 5.4 which comes with Ubuntu 16.04 by default. Here is how to install gcc 7 on Ubuntu 16.04. Run these commands as root:
Some older compilers may not be able to compile modern code, such as gcc 5.4 which comes with Ubuntu 16.04 by default. Here is how to install gcc 7 on Ubuntu 16.04. Run these commands as root: