build: Use 'AM_GNU_GETTEXT_VERSION'.

* configure.ac: Add 'AM_GNU_GETTEXT_VERSION', as required by Autoconf 2.70.

diff --git a/configure.ac b/configure.ac
index 8166a56e8049f5fc069960a1db5724de20142064..271ac3c2debaab3777a9d85448d25927fc0665f8 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -704,6 +704,7 @@ dnl i18n tests
 #fi
 #AC_CHECK_FUNCS([bindtextdomain textdomain])
 AM_GNU_GETTEXT([external], [need-ngettext])
+AM_GNU_GETTEXT_VERSION([0.18.1])
 
 ### Some systems don't declare some functions.  On such systems, we
 ### need to at least provide our own K&R-style declarations.