...No, it should just be called core/util.concurrent... not lib/core/util.concurrent.
However, fix that one, and you'll get the Batik block complaining about a missing jar. I
didn't work that one out i'm afraid.
I corrected the path in jars.xml and didn't get any errors from the Batik block in the build.
jars.xml is now corrected in CVS.
-Bertrand