From db71a04c2ec73f09fee01c85c6343175657f2078 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Sun, 11 Oct 2020 16:09:51 +0900
Subject: [ruby/io-wait] Fix backward compatibility with earlier versions

https://github.com/ruby/io-wait/commit/898248931f
---
 ext/io/wait/extconf.rb | 1 +
 1 file changed, 1 insertion(+)

(limited to 'ext/io/wait/extconf.rb')

diff --git a/ext/io/wait/extconf.rb b/ext/io/wait/extconf.rb
index b5d36c3fe3..d20ff4553f 100644
--- a/ext/io/wait/extconf.rb
+++ b/ext/io/wait/extconf.rb
@@ -2,6 +2,7 @@
 require 'mkmf'
 target = "io/wait"
 
+have_func("rb_io_wait")
 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|
-- 
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