From 4e3997293b3825ed19de20d5484f8c0f66fce534 Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Sun, 4 Sep 2016 22:53:22 +0200
Subject: [PATCH] engines/afalg: make it compile with backward compatibility
 headers.

Reviewed-by: Tim Hudson <tjh@openssl.org>
---
 engines/afalg/e_afalg.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/engines/afalg/e_afalg.c b/engines/afalg/e_afalg.c
index 2ea5ba5232..2c13ba80ed 100644
--- a/engines/afalg/e_afalg.c
+++ b/engines/afalg/e_afalg.c
@@ -8,7 +8,9 @@
  */
 
 /* Required for vmsplice */
-#define _GNU_SOURCE
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE
+#endif
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
@@ -17,11 +19,13 @@
 #include <openssl/async.h>
 #include <openssl/err.h>
 
+#include <sys/socket.h>
 #include <linux/version.h>
 #define K_MAJ   4
 #define K_MIN1  1
 #define K_MIN2  0
-#if LINUX_VERSION_CODE <= KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2)
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(K_MAJ, K_MIN1, K_MIN2) || \
+    !defined(AF_ALG)
 # warning "AFALG ENGINE requires Kernel Headers >= 4.1.0"
 # warning "Skipping Compilation of AFALG engine"
 void engine_load_afalg_int(void)
@@ -30,7 +34,6 @@ void engine_load_afalg_int(void)
 #else
 
 # include <linux/if_alg.h>
-# include <sys/socket.h>
 # include <fcntl.h>
 # include <sys/utsname.h>
 
-- 
2.25.1