I personally think we shouldn't worry about it. I
try to use an autoconf version at least as recent as what was used for the current file, but beyond that it is unlikely anything depends on autoconf distroisms within our own in tree configure.
Forcing humans to do weird tricks (always guaranteed to fail) to keep this in some I'll defined state or another seems odd given anyone can rerun autoconf (as the F package apparently does?) themselves if an issue with it ever comes up. We only check it in and ship it in source tarballs as a convenience.
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blame half the typos on my phone.