making coreutils depend on c99

[Jim Meyering]

I want to make coreutils/src/*.c depend on c99, at least for
the ability to intermix statements and declarations and to be
able to declare variables in `for' loops.

Do any of you know of platforms for which that would not work?
I.e., for which there is a useful (or better, `essential') compiler
lacking such support?

I don't know of an automatic c99-to-c89 translator...