Best way to force an "arg"?

[Sean LeBlanc <se...@nutros.com>]

What I want to do is to force at least one "arg" to be present, so
I can define a branch of things to happen. What's the cleanest way
to do this?

I want something like:

ant (foo|bar) <other targets...>

but I want the build to exit if foo or bar do not exist on the command line. 
I've tried some
things (they didn't seem very elegant to me), but I ended up having 
troubles with the <fail> task. It says that unless is not a supported 
attribute? What gives with this?



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