How can I ensure all output from Ant's exec task goes to stdout?

The Ant exec task has an output property which can be used to tell Ant where the output goes. I've used it to redirect the output to a file. The thing is, if I don't do something with the output, the stuff that Ant prints isn't that much of a help - it's not complete.

Is there someway of setting the output property to System.out?