<?xml version="1.0" encoding="UTF-8"?>

 <project name="incompatibilities" default="run" basedir=".">

     <target name="clean">

         <delete dir="build"/>

     </target>

     <target name="compile" depends="build"/>

     <target name="build" depends="clean">

         <echo level="info" message="Compiles with 1.4"/>

         <antcall target="-build-one">

             <param name="version" value="plain"/>

             <param name="source" value="1.4"/>

         </antcall>

         <echo level="info" message="Compiles with 1.5"/>

         <antcall target="-build-one">

             <param name="version" value="generics"/>

             <param name="source" value="1.5"/>

         </antcall>

     </target>

     <!-- support methods -->

     <target name="-build-one">

         <fail message="You need to specify version number" unless="version"/>

         <fail message="You need to specify source number" unless="source"/>

         <property name="target" value="${version}"/>

         <mkdir dir="build/${target}/classes"/>

         <javac 

             srcdir="src-${version}" 

             destdir="build/${target}/classes" 

             source="${source}" target="${source}"

             classpath="${cp}"

             failonerror="false"

         />

     </target>

 </project>