From 35783854244f8dc6a9f7fb4dfae752f8361c66bd Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Thu, 13 Nov 2025 02:27:30 +0900
Subject: [PATCH] include ruby.h to avoid load failures

```
.../io/wait.so: undefined symbol: ruby_abi_version - ruby_abi_version
```
---
 ext/io/wait/wait.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ext/io/wait/wait.c b/ext/io/wait/wait.c
index 22f372aa9a..f27d7c11e5 100644
--- a/ext/io/wait/wait.c
+++ b/ext/io/wait/wait.c
@@ -15,6 +15,8 @@
  * IO wait methods are built in ruby now, just for backward compatibility.
  */
 
+#include "ruby.h"
+
 void
 Init_wait(void)
 {