Adding new Ant tasks and types
  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:
  
    - Open the 
     Ant > Runtime
    preference page. Ant > Runtime
    preference page.
- Click the Tasks tab or the Types tab.
- Click Add Task or Add Type.
- Provide a name and class for the task or type.
- Select the library where the task or type is declared. If the library is not present on the list, you must add
    it to the Ant classpath (see the Related task link below).
Ant Support
  Builds
  External tools
  Running external tools
  Modifying the Ant classpath
  Using a different version of Ant