How do I use ant with ANTLR 3?

For complete information, see How to use ant with ANTLR3.

1. download ant-antlr3 task from
   http://www.antlr.org/share/1169924912745/antlr3-task.zip
2. copy to where ant can see it. My mac:
   $ sudo cp /usr/local/lib/ant-antlr3.jar /usr/share/ant/lib/
   my linux box:
   $ sudo cp /tmp/ant-antlr3.jar /usr/local/apache-ant-1.8.1/lib/
   Then, this
   $ ant -diagnostics
   should show:

   -------------------------------------------
    ANT_HOME/lib jar listing
   -------------------------------------------
   ant.home: /usr/share/ant
   ant-antlr.jar (5758 bytes)
   ant-antlr3.jar (20628 bytes)   <---------
   ...
   

3. make sure antlr2, antlr3, ST are in classpath. All in one is here:
   http://antlr.org/download/antlr-3.3-complete.jar
4. use in build.xml

   	<path id="classpath">
   		<pathelement location="${antlr3.jar}"/>
   		<pathelement location="${ant-antlr3.jar}"/>
   	</path>
   
   	<target name="antlr" depends="init">
   		<antlr:ant-antlr3 xmlns:antlr="antlib:org/apache/tools/ant/antlr"
   			target="src/T.g"
   			outputdirectory="build">
   			<classpath refid="classpath"/>
   		</antlr:ant-antlr3>
   	</target>