Features with exlusive options : how ?

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Hi,

An install has 3 installation types.
3rd is custom : select the features to install
One of the features has 3 options, but only one of them may be installed.
What's the elegant way to do this ?

I've been working on setupbuilder for a week, and initially got a lot of setup
script code, but after reading, checking the docs, most of it disappeared as it
already was availablein templates
But for this option I didn't find anything in docs/examples. Maybe I'm looking
at the wrong places.

Thanks for helping

Hans Vinckier