Sending -J-mx128m to Javac Task

[twm139]

I am running ant 1.2 and I am trying to send a command line arg to it.
Specifically to increase memory heap size. Is this possible or am I going
to have to throw out the javac task and replace it with a exec task. Seems
to me this feature should be there for just this situation.

I have tried both nested tags arg and jvmarg and javac does not support
either for some reason.

Cheers,

Terrence