We're using packaged ant, so no need to unzip.

Index: netbeans-7.0+dfsg1/o.apache.tools.ant.module/external/build.xml
===================================================================
--- netbeans-7.0+dfsg1.orig/o.apache.tools.ant.module/external/build.xml	2011-07-04 10:21:45.664204539 +0100
+++ netbeans-7.0+dfsg1/o.apache.tools.ant.module/external/build.xml	2011-07-04 10:21:58.674204440 +0100
@@ -45,7 +45,7 @@
 -->
 <project name="o.apache.tools.ant.module/external" default="unzip" basedir=".">
     <target name="unzip">
-        <unzip src="ant-libs-1.8.2.zip" dest="lib"/>
+<!--        <unzip src="ant-libs-1.8.2.zip" dest="lib"/>-->
     </target>
     <target name="clean">
         <delete dir="lib"/>
Index: netbeans-7.0+dfsg1/o.apache.tools.ant.module/build.xml
===================================================================
--- netbeans-7.0+dfsg1.orig/o.apache.tools.ant.module/build.xml	2011-07-04 10:22:14.294202648 +0100
+++ netbeans-7.0+dfsg1/o.apache.tools.ant.module/build.xml	2011-07-04 10:23:16.714203155 +0100
@@ -79,14 +79,14 @@
 
     <target name="netbeans-extra" depends="jar-bridge">
         <mkdir dir="${cluster}/ant/lib"/>
-        <copy todir="${cluster}/ant/lib">
+<!--        <copy todir="${cluster}/ant/lib">
             <fileset dir="external/lib"/>
         </copy>
         <unzip dest="${cluster}/ant">
             <fileset dir="external">
                 <include name="ant-misc-*.zip"/>
             </fileset>
-        </unzip>
+        </unzip>-->
     </target>
 
     <target name="test-build" depends="jar-bridge,projectized-common.test-build"/>
