-dependall:   .NOTMAIN realdepend .MAKE
  -     @cd "${.CURDIR}"; ${MAKE} realall
  +dependall:   .NOTMAIN realdepend .WAIT realall .MAKE
I don't see why depend in one subdir can't be in parallel with make in
another.  Why is the .WAIT necessary?
It seems odd for the order to be different.
I would think anything that depends on ordering should have code to
express this, but I have not yet taken the time to really understand.
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