https://git.ruby-lang.org/ruby.git/commit/?id=b29c0fadec

From b29c0fadeca7bd7d00d9fe17345fe88bf968312f Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Thu, 17 Dec 2020 00:28:48 +0900
Subject: add HAVE_RB_EXT_RACTOR_SAFE macro

define HAVE_RB_EXT_RACTOR_SAFE to check rb_ext_ractor_safe() is
available or not.

diff --git a/include/ruby/internal/intern/load.h b/include/ruby/internal/intern/load.h
index f9ba542..2cc5be0 100644
--- a/include/ruby/internal/intern/load.h
+++ b/include/ruby/internal/intern/load.h
@@ -37,6 +37,7 @@ VALUE rb_require_string(VALUE); https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/intern/load.h#L37
 // extension configuration
 void rb_ext_ractor_safe(bool flag);
 #define RB_EXT_RACTOR_SAFE(f) rb_ext_ractor_safe(f)
+#define HAVE_RB_EXT_RACTOR_SAFE 1
 
 RBIMPL_SYMBOL_EXPORT_END()
 
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