first up, i can't find anyone using M4DIR anymore (has been deprecated for a while at this point), so i'm dropping it wrt AT_M4DIR.
next, i'm explicitly noting GNU m4 as a requirement in the autotools.eclass. i believe this has always been de-facto case (we certainly use non-POSIX flags like -I/--include), and i wanted to use a few more features without having to worry about portability. plus, the autoconf website says GNU m4 is required for autoconf. -mike
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