From 943f3e5fd463bf2a4a3a4e92b5134e238b9c931d Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Mon, 9 Dec 2019 16:20:35 +0900
Subject: add include guard

---
 builtin.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'builtin.h')

diff --git a/builtin.h b/builtin.h
index a31d88b073..0d2b13e290 100644
--- a/builtin.h
+++ b/builtin.h
@@ -1,3 +1,6 @@
+#ifndef BUILTIN_H_INCLUDED
+#define BUILTIN_H_INCLUDED
+
 // invoke
 
 struct rb_builtin_function {
@@ -66,3 +69,5 @@ struct builtin_binary {
     const unsigned char *bin;     // binary by ISeq#to_binary
     size_t bin_size;
 };
+
+#endif // BUILTIN_H_INCLUDED
-- 
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