From f36d96144da10acf0a4ea104de393fb87427f4d9 Mon Sep 17 00:00:00 2001
From: Jon Siwek <jsiwek@ncsa.illinois.edu>
Date: Tue, 5 Jun 2012 15:34:30 -0500
Subject: [PATCH] Add a config.h definition for IPPROTO_IPV4.

Some older systems may only have IPPROTO_IPIP, the same value, but
less clear to read.
---
 config.h.in | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/config.h.in b/config.h.in
index c2cb3ec1dc..5368d6824e 100644
--- a/config.h.in
+++ b/config.h.in
@@ -165,6 +165,10 @@
 #ifndef HAVE_IPPROTO_IPV6
 #define IPPROTO_IPV6 41
 #endif
+#cmakedefine HAVE_IPPROTO_IPV4
+#ifndef HAVE_IPPROTO_IPV4
+#define IPPROTO_IPV4 4
+#endif
 #cmakedefine HAVE_IPPROTO_ROUTING
 #ifndef HAVE_IPPROTO_ROUTING
 #define IPPROTO_ROUTING 43