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

 <project name="Downloads necessary libraries" default="libraries" basedir=".">

     <target name="clean">

         <delete dir="dist"/>

     </target>

     <target name="libraries">

         <antcall target="-library">

             <param name="library" value="junit-4.4"/>

             <param name="url" value="http://switch.dl.sourceforge.net/sourceforge/junit/junit-4.4.jar"/>

         </antcall>

     </target>

     <!-- support methods -->

     <target name="-library-check">

         <fail message="You need to specify library name" unless="library"/>

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

         <property name="library.jar" location="dist/${library}.jar"/>

         <echo message="Checking for ${library.jar}"/>

         <available file="${library.jar}" property="library.available"/>

     </target>

     <target name="-library" depends="-library-check" unless="library.available">

         <mkdir dir="dist"/>

         <get dest="${library.jar}" src="${url}"/>

         <fail message="Now the library ${library} should be downloaded">

             <condition>

                 <not><available file="${library.jar}"/></not>

             </condition>

         </fail>

     </target>

 </project>