PMake -- A Tutorial
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# 4.5. Compatibility

There are three (well, 3 1/2) levels of backwards-compatibility built into PMake. Most makefiles will need none at all. Some may need a little bit of work to operate correctly when run in parallel. Each level encompasses the previous levels (e.g. `-B` (one shell per command) implies `-V`). The three levels are described in the following three sections.

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