$NetBSD: patch-ap,v 1.2 2010/11/15 05:18:16 jnemeth Exp $

--- configure.ac.orig	2010-09-10 01:16:32.000000000 +0000
+++ configure.ac
@@ -796,6 +796,9 @@ AST_C_DEFINE_CHECK([IP_MTU_DISCOVER], [I
 AC_CHECK_HEADER([libkern/OSAtomic.h],
                 [AC_DEFINE_UNQUOTED([HAVE_OSX_ATOMICS], 1, [Define to 1 if OSX atomic operations are supported.])])
 
+AC_CHECK_HEADER([sys/atomic.h],
+                [AC_DEFINE_UNQUOTED([HAVE_SYS_ATOMIC_H], 1, [Define to 1 if sys/atomic.h atomic operations are supported.])])
+
 AC_CHECK_SIZEOF(int)
 AC_CHECK_SIZEOF(long)
 AC_CHECK_SIZEOF(long long)