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20.1 Recognizing platforms

build-aux/config.guess

build-aux/config.sub

These files are helper scripts, invoked by the ‘configure’ script. config.guess recognizes the platform on which the script is running, and produces a triplet of the form cpu-type-vendor-operating_system. config.sub receives a possibly abbreviated triplet and produces a canonical triplet for a platform. For more information, see https://www.gnu.org/prep/standards/html_node/Configuration.html.

It is important that you always include the newest versions of these two files in your tarball, because people who work on emerging platforms otherwise have a hard time building your package.