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Check jar file existance

<?xml version="1.0"?> <project name="Apache Ant Properties Project" basedir=".">      <property name="jstl.jar" value="jstl.jar"/>       <condition property="jstl.jar.exists">     <available file="${jstl.jar}" filepath="./lib"/>   </condition>   <target name="build-jstl" depends="checkout-jstl" unless="jstl.jar.exists">     <echo message="Building ${jstl.jar}"/>   </target> </project>