https://git.ruby-lang.org/ruby.git/commit/?id=566bdaef31

From 566bdaef318674c416494786da551021afb1b5d7 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 25 Dec 2021 16:50:14 +0900
Subject: Define fallback RUBY_DEVEL to suppress undef warnings

---
 vm_debug.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vm_debug.h b/vm_debug.h
index 230f0f7b16e..fa70de334d3 100644
--- a/vm_debug.h
+++ b/vm_debug.h
@@ -31,6 +31,10 @@ void ruby_set_debug_option(const char *str); https://github.com/ruby/ruby/blob/trunk/vm_debug.h#L31
 
 RUBY_SYMBOL_EXPORT_END
 
+#ifndef RUBY_DEVEL
+# define RUBY_DEVEL 0
+#endif
+
 #if RUBY_DEVEL
 #ifndef USE_RUBY_DEBUG_LOG
 #define USE_RUBY_DEBUG_LOG 0
-- 
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