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14.4.4 ‘Makevars’ in ‘po/’
--------------------------

   The ‘po/’ directory also has a file named ‘Makevars’.  It contains
variables that are specific to your project.  ‘po/Makevars’ gets
inserted into the ‘po/Makefile’ when the latter is created.  The
variables thus take effect when the POT file is created or updated, and
when the message catalogs get installed.

   The first three variables can be left unmodified if your package has
a single message domain and, accordingly, a single ‘po/’ directory.
Only packages which have multiple ‘po/’ directories at different
locations need to adjust the three first variables defined in
‘Makevars’.

   As an alternative to the ‘XGETTEXT_OPTIONS’ variable, it is also
possible to specify ‘xgettext’ options through the ‘AM_XGETTEXT_OPTION’
autoconf macro.  See *note AM_XGETTEXT_OPTION::.