The task may be accessed via the Build Extensions Toolkit name space by defining that name space in the project element and calling the loadBuildExtensions task to register participating EWM® and Enterprise Extensions Ant tasks and types under the Build Extensions Toolkit name space.
For example:
<project
default="main"
name=""
xmlns:xt="antlib:com.ibm.team.build.extensions.toolkit">
<xt:loadBuildExtensions/>
<target name="main">
<xt: ... />
</target>
<project>