Index: trunk/build.xml
===================================================================
--- trunk/build.xml	(revision 13573)
+++ trunk/build.xml	(revision 13574)
@@ -642,4 +642,5 @@
             <classpath path="${tools.dir}/animal-sniffer-ant-tasks.jar"/>
         </typedef>
+        <delete dir="${dir}" failonerror="false"/>
         <mkdir dir="${dir}"/>
         <!-- List of deprecated plugins -->