I patched this in and tried it; I got -- BUILD FAILED /google-caja/build.xml:129: The following error occurred while executing this line: .../google-caja/third_party/java/appengine/config/user/ant-macros.xml:83: taskdef class com.google.appengine.tools.enhancer.EnhancerTask cannot be found
http://codereview.appspot.com/116069
