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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For questions about this documentation, e-mail <[email protected]>.