...
<path id="javac2-libs">
<fileset dir="${path.variable.application-home-dir}/lib">
<include name="asm.jar"/>
<include name="asm-commons.jar"/>
<include name="javac2.jar"/>
<include name="jdom.jar"/>
</fileset>
</path>
<taskdef name="javac2" classname="com.intellij.ant.Javac2">
<classpath refid="javac2-libs"/>
</taskdef>
...