This is based on Arthur Lemmens's Rucksack with some enhancements.
To compile and load Rucksack and make sure that the basics are working:
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Make sure you have ASDF (Another System Definition Facility) loaded.
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Load rucksack.asd.
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Load tests/rucksack-test.asd.
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(asdf:oos 'asdf:load-op :rucksack-test)
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(in-package :rucksack-test)
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(run-tests)
The tutorial by Brad Beveridge (in doc/rucksack-tutorial.lisp) is a good next step.