Way to determine autotools dependencies automatically?

[Reuben Thomas]

Just now doing a git merge I caught sight of an AC_PREREQ line in one
.m4 file. Is there a built-in way to extract the required versions of
autoconf, automake &c. from an autotools build system? (I can't find
an answer, but there's an awful lot of cool undocumented stuff in
there at present.)

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