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If AM_GNU_GETTEXT is seen in configure.ac, then Automake
turns on support for GNU gettext, a message catalog system for
internationalization
(see Introduction in GNU gettext utilities).
The gettext support in Automake requires the addition of one or
two subdirectories to the package, po and possibly also intl.
The latter is needed if AM_GNU_GETTEXT is not invoked with the
‘external’ argument, or if AM_GNU_GETTEXT_INTL_SUBDIR is used.
Automake ensures that these directories exist and are mentioned in
SUBDIRS.