From e44c7d02ddac975ec6abff7901e77a0c37f9949d Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Thu, 18 Jan 2018 14:05:33 +0100
Subject: [PATCH] Only implement secure malloc if _POSIX_VERSION allows

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5060)
---
 crypto/mem_sec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crypto/mem_sec.c b/crypto/mem_sec.c
index 0c24ed819b..87c19a1395 100644
--- a/crypto/mem_sec.c
+++ b/crypto/mem_sec.c
@@ -20,7 +20,9 @@
 
 #include <string.h>
 
-#if defined(OPENSSL_SYS_LINUX) || defined(OPENSSL_SYS_UNIX)
+/* e_os.h includes unistd.h, which defines _POSIX_VERSION */
+#if defined(OPENSSL_SYS_UNIX) \
+    && defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L
 # define IMPLEMENTED
 # include <stdlib.h>
 # include <assert.h>
-- 
2.25.1