--- lib/charset.c.orig	2017-08-17 19:29:14.000000000 -0500
+++ lib/charset.c	2017-09-14 18:27:25.000000000 -0500
@@ -767,7 +767,7 @@
     struct convert_rock *input, *tobuffer;
     char *res;
 
-    if (!s) return 0;
+    if (!s) return (char *) 0;
 
     if (charset < 0 || charset >= chartables_num_charsets) 
 	return xstrdup("X");