https://git.ruby-lang.org/ruby.git/commit/?id=3238164f9c

From 3238164f9c2314577f8adc544bede132bd54ad2b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 29 Dec 2021 09:22:12 +0900
Subject: `ioctl_narg_len` is used only when ioctl(2) is available

---
 io.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/io.c b/io.c
index 4ed4ee34f84..7ff7e5a33c6 100644
--- a/io.c
+++ b/io.c
@@ -10148,6 +10148,7 @@ linux_iocparm_len(ioctl_req_t cmd) https://github.com/ruby/ruby/blob/trunk/io.c#L10148
 }
 #endif
 
+#ifdef HAVE_IOCTL
 static long
 ioctl_narg_len(ioctl_req_t cmd)
 {
@@ -10169,6 +10170,7 @@ ioctl_narg_len(ioctl_req_t cmd) https://github.com/ruby/ruby/blob/trunk/io.c#L10170
 
     return len;
 }
+#endif
 
 #ifdef HAVE_FCNTL
 #ifdef __linux__
-- 
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