diff --git a/build.xml b/build.xml
index 29c6f143..7cf520c2 100644
--- a/build.xml
+++ b/build.xml
@@ -237,7 +237,14 @@
              classname="com.rc.retroweaver.ant.RetroWeaverTask"/>
     <mkdir dir="${deploy.dir}/retro"/>
     <weave inputjar="${deploy.dir}/${app.name}.jar"
-           outputjar="${deploy.dir}/retro/${app.name}.jar"/>
+           outputjar="${deploy.dir}/retro/${app.name}.jar" failonerror="true">
+      <classpath>
+        <pathelement location="/usr/local/jdk1.4/jre/lib/rt.jar"/>
+        <pathelement location="lib/retroweaver-rt-1.2.2.jar"/>
+        <pathelement location="dist/retro/samskivert.jar"/>
+        <fileset dir="lib" includes="**/*.jar"/>
+      </classpath>
+    </weave>
   </target>
 
   <!-- generate a class hierarchy diagram -->