diff --git a/build.py b/build.py
index 3b2f61ed496..dc975f27628 100755
--- a/build.py
+++ b/build.py
@@ -126,6 +126,11 @@ def execute(args):
     try:
         if len(args) > 0 and args[0] == "-hudson":
             build_hudson()
+        elif len(args) > 0 and args[0] == "-perf":
+            A = list(args)
+            A.pop(0)
+            A = "-listener net.sf.antcontrib.perf.AntPerformanceListener".split() + A
+            java_omero(A)
         else:
             java_omero(args)
             notification(""" Finished: %s """ % " ".join(args), 0)
diff --git a/lib/repository/omero.java b/lib/repository/omero.java
index 45757dd227e..6736407af31 100644
--- a/lib/repository/omero.java
+++ b/lib/repository/omero.java
@@ -190,13 +190,14 @@ private boolean isJDKToolsAvailable()
     private File[] locateBuildJars()
         throws Exception
     {
-        File[] jars = new File[6];
+        File[] jars = new File[7];
 	jars[0] = new File("lib/repository/junit-3.8.1.jar");
 	jars[1] = new File("lib/repository/ant-1.8.0.jar");
 	jars[2] = new File("lib/repository/ant-launcher-1.8.0.jar");
 	jars[3] = new File("lib/repository/ant-junit-1.8.0.jar");
 	jars[4] = new File("lib/repository/ant-nodeps-1.8.0.jar");
-	jars[5] = new File("lib/repository/bsh-2.0b4.jar");
+	jars[5] = new File("lib/repository/ant-contrib-1.0b3.jar");
+	jars[6] = new File("lib/repository/bsh-2.0b4.jar");
 
         if (!isJDKToolsAvailable()) {  //Try and grab tools.jar.
             if (jdkTools.exists()) {  //Add it to the other jars.
diff --git a/omero.class b/omero.class
index 0720d8e8d06..6893b97bf76 100644
Binary files a/omero.class and b/omero.class differ