From 952fa45645a05601034130fcd36a0217af924605 Mon Sep 17 00:00:00 2001
From: usa <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 12 May 2017 09:36:57 +0000
Subject: unistd.h is only available when HAVE_UNISTD_H is 1

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58679 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 spec/rubyspec/optional/capi/ext/thread_spec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/spec/rubyspec/optional/capi/ext/thread_spec.c b/spec/rubyspec/optional/capi/ext/thread_spec.c
index 5ea96fe3d6..78e8183129 100644
--- a/spec/rubyspec/optional/capi/ext/thread_spec.c
+++ b/spec/rubyspec/optional/capi/ext/thread_spec.c
@@ -4,7 +4,9 @@
 
 #include <math.h>
 #include <errno.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 #ifdef __cplusplus
 extern "C" {
-- 
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