Well after some help from Stefan Bodewig, I can now report that the problem has been resolved. It seems that I had another version of Ant installed on my machine, and that during the boostrap process it was using the old version, not the new one. How it was doing this is a mistery, as it was not on the CLASSPATH, but I would suggest that anyone who has this problem check (and double check) that there really is no older version of Ant installed anywhere that the boostrap process might find it. My old version, just for record, was a copy of 1.0 which I had installed using RPM.
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