From 367c17d1cf143ae0e9ab866d137bed161aaebd04 Mon Sep 17 00:00:00 2001
From: Angus Gratton <gus@projectgus.com>
Date: Fri, 27 May 2016 11:48:59 +1000
Subject: [PATCH] lwip: Fix 'errno' not being set by sockets layer

---
 lwip/include/arch/cc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lwip/include/arch/cc.h b/lwip/include/arch/cc.h
index 04dab26..2922a54 100644
--- a/lwip/include/arch/cc.h
+++ b/lwip/include/arch/cc.h
@@ -50,6 +50,8 @@
 #include <sys/time.h>
 #include <sys/errno.h>
 
+#define ERRNO
+
 #define BYTE_ORDER LITTLE_ENDIAN
 
 /** @todo fix some warnings: don't use #pragma if compiling with cygwin gcc */