Thanks. I had a look at this (and other google results) before posting. There are basically two solutions on that
thread: write a custom task & create an external version number file.
I was hoping to do this with vanilla
ant, and not have to resort to writing a task. The external version file is nice, but I need to use the new property value later in the same build script, so not really what I need.
I'm sure I'll work it out.