https://git.ruby-lang.org/ruby.git/commit/?id=ba78bf9778

From ba78bf9778082795bdb4735ccd7b692b5c3769f9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Wed, 25 Dec 2019 14:19:48 +0900
Subject: debug_counter.h must be self-contained

Include what is necessary.

diff --git a/debug_counter.h b/debug_counter.h
index 066533d..eb313fc 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -341,6 +341,10 @@ RB_DEBUG_COUNTER(load_path_is_not_realpath) https://github.com/ruby/ruby/blob/trunk/debug_counter.h#L341
 #ifndef RUBY_DEBUG_COUNTER_H
 #define RUBY_DEBUG_COUNTER_H 1
 
+#include "ruby/config.h"
+#include <stddef.h>             /* for size_t */
+#include "ruby/ruby.h"          /* for VALUE */
+
 #if !defined(__GNUC__) && USE_DEBUG_COUNTER
 #error "USE_DEBUG_COUNTER is not supported by other than __GNUC__"
 #endif
-- 
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