make needs to know when another instance of make is being invoked in
order to manage a parallel build. make only understand $(MAKE) to cause
another invocation (that's not strictly true but I'm unsure of how
portable the '+' operator is, so I don't think it's an option for
Parrot). The functionality of $(MAKE_C) should be moved to configure
time so this variable can be replaced with $(MAKE).
-J
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-J
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