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diff --git a/gnulib-m4/gnulib-i18n.m4 b/gnulib-m4/gnulib-i18n.m4
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+# gnulib-i18n.m4
+# serial 1
+dnl Copyright (C) 2005-2025 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+dnl This file is offered as-is, without any warranty.
+
+dnl From Bruno Haible.
+
+dnl Support for internationalization of Gnulib code.
+
+dnl GNULIB_I18N
+dnl Sets GNULIB_LOCALEDIR to indicate where to find the gnulib.mo files.
+dnl Also it defines GNULIB_LOCALEDIR as macro in config.h, that expands to
+dnl the corresponding C string.
+AC_DEFUN([GNULIB_I18N],
+[
+  dnl It is best to not test "$USE_NLS" here, because: It would be empty
+  dnl in case the package is internationalized but this macro is used before
+  dnl AM_GNU_GETTEXT. We would need to warn about this situation. But since
+  dnl this module is used as a dependency of many packages, such a warning is
+  dnl not welcome.
+
+  dnl Determine gnulib's localedir.
+  dnl Generally, accept an option --with-gnulib-prefix=PREFIX to indicate
+  dnl where to find gnulib's runtime data.
+  dnl Usually ${prefix}/share/locale, but can be influenced by the configure
+  dnl options --datarootdir and --localedir.
+  GNULIB_LOCALEDIR="${localedir}"
+  AC_ARG_WITH([gnulib-prefix],
+    [[  --with-gnulib-prefix=DIR  search for gnulib's runtime data in DIR/share]],
+    [if test "X$withval" != "X" && test "X$withval" != "Xno"; then
+       GNULIB_LOCALEDIR="$withval/share/locale"
+     fi
+    ])
+  AC_SUBST([GNULIB_LOCALEDIR])
+
+  dnl Define GNULIB_LOCALEDIR_c and GNULIB_LOCALEDIR_c_make.
+  dnl Find the final value of GNULIB_LOCALEDIR.
+  gl_saved_prefix="${prefix}"
+  gl_saved_datarootdir="${datarootdir}"
+  gl_saved_localedir="${localedir}"
+  gl_saved_gnuliblocaledir="${GNULIB_LOCALEDIR}"
+  dnl Unfortunately, prefix gets only finally determined at the end of
+  dnl configure.
+  if test "X$prefix" = "XNONE"; then
+    prefix="$ac_default_prefix"
+  fi
+  eval datarootdir="$datarootdir"
+  eval localedir="$localedir"
+  eval GNULIB_LOCALEDIR="$GNULIB_LOCALEDIR"
+  gl_BUILD_TO_HOST([GNULIB_LOCALEDIR])
+  GNULIB_LOCALEDIR="${gl_saved_gnuliblocaledir}"
+  localedir="${gl_saved_localedir}"
+  datarootdir="${gl_saved_datarootdir}"
+  prefix="${gl_saved_prefix}"
+
+  AC_DEFINE_UNQUOTED([GNULIB_LOCALEDIR], [${GNULIB_LOCALEDIR_c}],
+    [Define to the directory where to find the localizations of the translation domain 'gnulib', as a C string.])
+])