Add new Ant tasks and types through the Ant preferences page. These tasks and types will be available for buildfiles running in the Workbench without, having to use taskdef or typedef in the script declaration (For more on taskdef or typedef see the Ant documentation in http://ant.apache.org).
To add a new task or type:
Ant Support
Builds
External tools
Running external tools
Modifying the Ant classpath
Using a different version of Ant