Accept 4 digit script tag in FcLangNormalize().
diff --git a/src/fclang.c b/src/fclang.c
index fc0620c..bbdce2c 100644
--- a/src/fclang.c
+++ b/src/fclang.c
@@ -259,7 +259,8 @@
 		 lang);
 	goto bail0;
     }
-    if (territory && (tlen < 2 || tlen > 3))
+    if (territory && (tlen < 2 || tlen > 3) &&
+	!(territory[0] == 'z' && tlen < 5))
     {
 	fprintf (stderr, "Fontconfig warning: ignoring %s: not a valid region tag\n",
 		 lang);