<project default="all">
	<path id="someclasspath">
		<fileset dir="${ant.home}/lib" includes="sometask.jar"/>
	</path>

	<taskdef name="sometask" classname="com.foo.SomeTask"
classpathref="someclasspath"/>

	<target name="all">
		<echo>Hello ${ant.home}</echo>
	</target>
</project>