gettext requirement 0.21 too strict
commit ba75f470 contains no rationale why it has to be gettext-version 0.21.
This change happens to work in a Leap 15.4 environment:
--- a/configure.ac
+++ b/configure.ac
@@ -57,7 +57,7 @@ GETTEXT_PACKAGE="$PACKAGE"
AC_DEFINE_UNQUOTED([GETTEXT_PACKAGE], ["$GETTEXT_PACKAGE"], [Name of default gettext domain])
AC_SUBST([GETTEXT_PACKAGE])
AM_GNU_GETTEXT([external])
-AM_GNU_GETTEXT_VERSION([0.21])
+AM_GNU_GETTEXT_VERSION([0.20])
dnl check for x11
XDT_CHECK_LIBX11_REQUIRE()
Please consider it for the next release.