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Re: Sets, subsets, syspkgs, and MK*

  > 2) why that needs to be done

  NetBSD 6.0 is released.
  Users install it.
  A critical bug is found next day.
  The user get a very small binary patch.

  Is this good?  Yes?  No?

That's a good use case, but I don't see how you get from there to
renaming variables.

If the original build is done with all MK/USE at defaults, builds are
reproducible, and the new build is also done that way, you can generate
a binary patch.  Changing MK/USE seems to me to have nothing to do with

Perhaps you could post a design for binary patch generation and application.

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