From 37d5691b19d5d90757df2548584f065320d7f092 Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dirk@ziegelmeier.net>
Date: Wed, 12 Oct 2016 07:37:39 +0200
Subject: [PATCH] Fix bug #49321: error.h missing opening "#ifdef __cplusplus"
 Reported by Martin Kortmann

---
 src/include/lwip/errno.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/include/lwip/errno.h b/src/include/lwip/errno.h
index e2d996c6..25bc1f89 100644
--- a/src/include/lwip/errno.h
+++ b/src/include/lwip/errno.h
@@ -39,6 +39,10 @@
 
 #include "lwip/opt.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #ifdef LWIP_PROVIDE_ERRNO
 
 #define  EPERM         1  /* Operation not permitted */