--- pith/charconv/utf8.c	2012-10-11 07:57:38.022062458 +0000
+++ pith/charconv/utf8.c	2012-10-11 08:59:56.205068504 +0000
@@ -16,6 +16,8 @@
  */
 
 
+#define _XOPEN_SOURCE
+
 /* includable WITHOUT dependency on c-client */
 #include <imap/mail.h>
 #include <imap/utf8.h>
@@ -38,6 +40,7 @@
 #include "utf8.h"
 
 #include <stdarg.h>
+#include <wchar.h>
 
 
 unsigned single_width_chars_a_to_b(UCS *, int, int);