usa	2017-05-12 18:36:57 +0900 (Fri, 12 May 2017)

  New Revision: 58679

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58679

  Log:
    unistd.h is only available when HAVE_UNISTD_H is 1

  Modified files:
    trunk/spec/rubyspec/optional/capi/ext/thread_spec.c
Index: spec/rubyspec/optional/capi/ext/thread_spec.c
===================================================================
--- spec/rubyspec/optional/capi/ext/thread_spec.c	(revision 58678)
+++ spec/rubyspec/optional/capi/ext/thread_spec.c	(revision 58679)
@@ -4,7 +4,9 @@ https://github.com/ruby/ruby/blob/trunk/spec/rubyspec/optional/capi/ext/thread_spec.c#L4
 
 #include <math.h>
 #include <errno.h>
+#if HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 
 #ifdef __cplusplus
 extern "C" {

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