redo is a competitor to the long-lived, but sadly imperfect, make program. There are many such competitors, because many people over the years have been dissatisfied with make's limitations. However, of all the replacements I've seen, only redo captures the essential simplicity and flexibility of make, while avoiding its flaws. To my great surprise, it manages to do this while being simultaneously simpler than make, more flexible than make, and more powerful than make.
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