[glade] gettext: Support 0.20

[Alberto Fanjul <albfan src gnome org>]

commit c74a685c65064a80681bb207cc005cf2634d7fb2
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Wed May 6 11:29:57 2020 +0200

    gettext: Support 0.20

 configure.ac | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/configure.ac b/configure.ac
index 79e4d58d..cb8edafd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -111,6 +111,7 @@ dnl Gettext stuff.
 dnl ================================================================
 AM_GNU_GETTEXT([external])
 AM_GNU_GETTEXT_VERSION([0.19.8])
+AM_GNU_GETTEXT_REQUIRE_VERSION([0.19.8])
 
 GETTEXT_PACKAGE=AC_PACKAGE_NAME
 AC_SUBST(GETTEXT_PACKAGE)