From f1c00b93e2138e5a45e8b500dec6bb3b2e035771 Mon Sep 17 00:00:00 2001
From: Andy Polyakov <appro@openssl.org>
Date: Sat, 10 Mar 2018 19:38:28 +0100
Subject: [PATCH] mem_sec.c: portability fixup.

Reviewed-by: Rich Salz <rsalz@openssl.org>
---
 crypto/mem_sec.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/crypto/mem_sec.c b/crypto/mem_sec.c
index ab4d137f63..1c1327037a 100644
--- a/crypto/mem_sec.c
+++ b/crypto/mem_sec.c
@@ -33,8 +33,10 @@
 # include <sys/mman.h>
 # if defined(OPENSSL_SYS_LINUX)
 #  include <sys/syscall.h>
-#  include <linux/mman.h>
-#  include <errno.h>
+#  if defined(SYS_mlock2)
+#   include <linux/mman.h>
+#   include <errno.h>
+#  endif
 # endif
 # include <sys/param.h>
 # include <sys/stat.h>