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14.4.7 ‘config.guess’, ‘config.sub’ at top level
------------------------------------------------

   You need to add the GNU ‘config.guess’ and ‘config.sub’ files to your
distribution.  They are needed because the ‘AM_ICONV’ macro contains
knowledge about specific platforms and therefore needs to identify the
platform.

   You can obtain the newest version of ‘config.guess’ and ‘config.sub’
from the ‘config’ project at ‘https://savannah.gnu.org/’.  The commands
to fetch them are
     $ wget -O config.guess 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD'
     $ wget -O config.sub 'https://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD'
Less recent versions are also contained in the GNU ‘automake’ and GNU
‘libtool’ packages.

   Normally, ‘config.guess’ and ‘config.sub’ are put at the top level of
a distribution.  But it is also possible to put them in a subdirectory,
altogether with other configuration support files like ‘install-sh’,
‘ltconfig’, ‘ltmain.sh’ or ‘missing’.  All you need to do, other than
moving the files, is to add the following line to your ‘configure.ac’.

     AC_CONFIG_AUX_DIR([SUBDIR])