From 03e6ef8c01209d8b518daa45ded3164666c992a8 Mon Sep 17 00:00:00 2001
From: Brian Smith <brian@briansmith.org>
Date: Fri, 18 Jan 2019 00:41:16 -1000
Subject: [PATCH] Avoid including <sys/syscall.h> on targets we already know
 about.

When cross-compiling to i686-unknown-linux-gnu from
x86_64-unknown-linux-gnu I found that this header wasn't found and the
build broken. Avoid that happening by only including this header when
we don't already know what it will tell us.
---
 crypto/crypto.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/crypto/crypto.c b/crypto/crypto.c
index 9c30693df9..6456dffefb 100644
--- a/crypto/crypto.c
+++ b/crypto/crypto.c
@@ -18,10 +18,6 @@
 
 #include <GFp/cpu.h>
 
-#if defined(__linux__)
-#include <sys/syscall.h>
-#endif
-
 #if defined(OPENSSL_WINDOWS)
 
 #if defined(_MSC_VER)
@@ -81,10 +77,14 @@ HIDDEN uint32_t GFp_armcap_P = 0;
 #elif defined(OPENSSL_X86_64)
 #define SYS_getrandom 318
 #else
+#include <sys/syscall.h>
+#if !defined(SYS_getrandom)
 #error "Error: Kernel headers are too old; SYS_getrandom not defined."
 #endif
 #endif
 
+#endif
+
 const long GFp_SYS_GETRANDOM = SYS_getrandom;
 #endif