From 48309d78777061beae80b3caa7e1153e16a6b258 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Tue, 1 Jul 2025 17:38:25 +0900
Subject: [PATCH] Run `have_func` with the header providing the declarations

---
 ext/io/wait/extconf.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/ext/io/wait/extconf.rb b/ext/io/wait/extconf.rb
index e63c046..ba223f0 100644
--- a/ext/io/wait/extconf.rb
+++ b/ext/io/wait/extconf.rb
@@ -5,8 +5,8 @@
   File.write("Makefile", dummy_makefile($srcdir).join(""))
 else
   target = "io/wait"
-  have_func("rb_io_wait")
-  have_func("rb_io_descriptor")
+  have_func("rb_io_wait", "ruby/io.h")
+  have_func("rb_io_descriptor", "ruby/io.h")
   unless macro_defined?("DOSISH", "#include <ruby.h>")
     have_header(ioctl_h = "sys/ioctl.h") or ioctl_h = nil
     fionread = %w[sys/ioctl.h sys/filio.h sys/socket.h].find do |h|