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