By 'optionally', I meant present user with a message box perhaps, or just default appropriately; as for versions we'd simply need to ensure we give different versions distinct names.
As for the _libs on the card suggestion, my idea was you keep the libraries stored in the same location as the program. For instance running it on a CF card, leaves the libs there- but they can be shared with other apps on the same card.
As for lib duplication, sadly it adds up quite quickly, when some libraries like libX11 consume 4MB each...
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