automake-1.16: gettext
10.2 Gettext
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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 (⇒Introduction (gettext)Top.).
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’.