https://git.ruby-lang.org/ruby.git/commit/?id=6abf393e8f

From 6abf393e8f372464322dc0a8c2bda80f8b389acd Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Mon, 18 Jan 2021 12:41:58 +0900
Subject: OpenBSD has getentropy, but no sys/random.h

https://man.openbsd.org/getentropy

Try to fix https://rubyci.s3.amazonaws.com/openbsd-current/ruby-master/log/20210118T023008Z.fail.html.gz
```
compiling random.c
random.c:53:11: fatal error: 'sys/random.h' file not found
# include <sys/random.h>
          ^~~~~~~~~~~~~~
1 error generated.
```

diff --git a/configure.ac b/configure.ac
index f672f6d..e4bdf9f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1195,6 +1195,7 @@ AC_CHECK_HEADERS(sys/ioctl.h) https://github.com/ruby/ruby/blob/trunk/configure.ac#L1195
 AC_CHECK_HEADERS(sys/mkdev.h)
 AC_CHECK_HEADERS(sys/param.h)
 AC_CHECK_HEADERS(sys/prctl.h)
+AC_CHECK_HEADERS(sys/random.h)
 AC_CHECK_HEADERS(sys/resource.h)
 AC_CHECK_HEADERS(sys/select.h)
 AC_CHECK_HEADERS(sys/sendfile.h)
diff --git a/random.c b/random.c
index 7b78efe..c11cd80 100644
--- a/random.c
+++ b/random.c
@@ -50,7 +50,9 @@ https://github.com/ruby/ruby/blob/trunk/random.c#L50
 #endif
 
 #if defined HAVE_GETRANDOM || defined HAVE_GETENTROPY
-# include <sys/random.h>
+# if defined(HAVE_SYS_RANDOM_H)
+#  include <sys/random.h>
+# endif
 #elif defined __linux__ && defined __NR_getrandom
 # include <linux/random.h>
 #endif
-- 
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