--- libcpp/internal.h	2012-07-30 09:24:59.000000000 +0000
+++ libcpp/internal.h	2013-09-04 00:41:26.000000000 +0000
@@ -27,6 +27,7 @@
 #include "cpp-id-data.h"
 
 #if HAVE_ICONV
+#define __bool_true_false_are_defined
 #include <iconv.h>
 #else
 #define HAVE_ICONV 0