$NetBSD$

--- src/configure.orig	2011-11-08 21:20:17.000000000 +0000
+++ src/configure
@@ -5104,8 +5104,10 @@ cat confdefs.h >>conftest.$ac_ext
 cat >>conftest.$ac_ext <<_ACEOF
 /* end confdefs.h.  */
   #include <wchar.h>
+  #include <strings.h>
    int main() {
      mbstate_t state;
+     bzero(&state, sizeof(mbstate_t));
     char *src = "X";
     mbsrtowcs(0, &src, 0, &state);
      return 0;
