Commons IO uses Maven its build system.

Commons IO requires a minimum of JDK 8 to build.

You may also be interested in the upgrade notes:
Upgrade from 2.0 to 2.0.1
Upgrade from 1.4 to 2.0
Upgrade from 1.3.2 to 1.4
Upgrade from 1.3, or 1.3.1 to 1.3.2
Upgrade from 1.3 to 1.3.1
Upgrade from 1.2 to 1.3
Upgrade from 1.1 to 1.2
Upgrade from 1.0 to 1.1

The following Maven commands can be used to build io:

• mvn clean - clean up
• mvn test - compile and run the unit tests
• mvn site - create io documentation
• mvn package - build the jar