diff -Nru openjdk.orig/langtools/make/build.xml openjdk/langtools/make/build.xml
--- openjdk-boot.orig/langtools/make/build.xml	2010-11-12 01:18:44.000000000 +0000
+++ openjdk-boot/langtools/make/build.xml	2010-11-22 17:50:52.747031959 +0000
@@ -622,7 +622,7 @@
         <genstubs
             srcdir="${import.jdk.src.dir}" destdir="${build.genstubs.dir}"
             includes="${import.jdk.stub.files}"
-            fork="true" classpath="${build.toolclasses.dir}:${build.bootstrap.dir}/classes:${ant.core.lib}"
+            fork="false" classpath="${build.toolclasses.dir}:${build.bootstrap.dir}/classes:${ant.core.lib}"
         />
     </target>
 
