Robbert Jan excluded com/sun from the pack a while ago, but this by accident also excluded jna which broke ecj apt support.

build.xml

@@ -1,5 +1,5 @@
 <!--
-  Copyright © 2010 Reinier Zwitserloot and Roel Spilker.
+  Copyright © 2010-2011 Reinier Zwitserloot and Roel Spilker.
   
   Permission is hereby granted, free of charge, to any person obtaining a copy
   of this software and associated documentation files (the "Software"), to deal
@@ -167,7 +167,7 @@ the common tasks and can be called on to run the main aspects of all the sub-scr
 		<taskdef name="jarjar" classname="com.tonicsystems.jarjar.JarJarTask" classpath="lib/build/jarjar.jar" />
 		<jarjar destfile="dist/lombok-${lombok.version}.jar">
 			<fileset dir="build/lombok">
-				<exclude name="com/sun/**"/>
+				<exclude name="com/sun/tools/javac/**"/>
 			</fileset>
 			<fileset dir="build" includes="changelog.txt" />
 			<fileset dir="." includes="LICENSE" />