$NetBSD: patch-ab,v 1.10 2010/09/07 19:12:03 adam Exp $

--- src/threads.h.orig	2009-08-30 09:03:26.000000000 +0000
+++ src/threads.h
@@ -23,6 +23,7 @@
 #define __THREADS_H__
 
 #include <unistd.h>
+#include <pthread.h>
 
 /* FIXME: mailbox_lock is really an internal libbalsa mutex. */
 extern pthread_mutex_t mailbox_lock;