$NetBSD: patch-ae,v 1.3 2007/12/06 16:59:37 christos Exp $

--- configure.ac.orig	2007-01-11 06:37:55.000000000 -0500
+++ configure.ac	2007-12-06 11:55:17.000000000 -0500
@@ -33,6 +33,12 @@
 freebsd*)
 	opsys=freebsd
 	AC_DEFINE([FREEBSD], 1, [Define for the FreeBSD operating system.])
+	AC_DEFINE([ALLBSD], 1, [Define for the BSD-like operating system.])
+	;;
+netbsd*)
+	opsys=netbsd
+	AC_DEFINE([NETBSD], 1, [Define for the NetBSD operating system.])
+	AC_DEFINE([ALLBSD], 1, [Define for the BSD-like operating system.])
 	;;
 *)
 	AC_MSG_RESULT([NO!])
@@ -119,6 +125,8 @@
 AM_CONDITIONAL([SUNOS4], [test x$opsys = xsunos4])
 AM_CONDITIONAL([SVR4], [test x$opsys = xsvr4])
 AM_CONDITIONAL([FREEBSD], [test x$opsys = xfreebsd])
+AM_CONDITIONAL([NETBSD], [test x$opsys = xnetbsd])
+AM_CONDITIONAL([ALLBSD], [test x$opsys = xnetbsd -o x$opsys = xfreebsd])
 
 AC_PROG_CC
 AC_GNU_SOURCE
@@ -194,7 +202,8 @@
 AC_CHECK_FUNCS(sigaction strerror strsignal pread sys_siglist _sys_siglist getdents mctl prctl sendmsg inet_ntop if_indextoname)
 AC_CHECK_HEADERS([sys/reg.h sys/filio.h sys/acl.h sys/asynch.h sys/door.h stropts.h sys/conf.h sys/stream.h sys/tihdr.h sys/tiuser.h sys/sysconfig.h ioctls.h sys/ioctl.h sys/ptrace.h termio.h linux/ptrace.h asm/reg.h sys/uio.h sys/aio.h poll.h sys/poll.h sys/vfs.h asm/sysmips.h linux/utsname.h sys/nscsys.h mqueue.h sys/epoll.h libaio.h inttypes.h], [], [])
 AC_CHECK_HEADERS([linux/icmp.h linux/in6.h linux/netlink.h linux/if_packet.h],
-                 [], [], [#include <linux/socket.h>])
+                 [], [], [#include <stddef.h>
+#include <linux/socket.h>])
 AC_CHECK_HEADERS([asm/sigcontext.h], [], [], [#include <signal.h>])
 AC_CHECK_HEADERS([netinet/tcp.h netinet/udp.h],,, [#include <netinet/in.h>])