https://github.com/ruby/ruby/commit/d77e02bd85ab7f841df8d473bac214b9a92a3506

From d77e02bd85ab7f841df8d473bac214b9a92a3506 Mon Sep 17 00:00:00 2001
From: "Z. Liu" <zhixu.liu@gmail.com>
Date: Wed, 2 Jul 2025 09:09:52 +0800
Subject: [PATCH] [Bug #21497] [ruby/socket]: add full prototype
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otherwise, gcc 15 will complain:

> init.c:573:19: error: too many arguments to function ‘Rconnect’; expected 0, have 3
>   573 |     return (VALUE)Rconnect(arg->fd, arg->sockaddr, arg->len);
>       |                   ^~~~~~~~ ~~~~~~~
> In file included from init.c:11:
> rubysocket.h:294:5: note: declared here
>   294 | int Rconnect();
>       |     ^~~~~~~~

> sockssocket.c:33:9: error: too many arguments to function ‘SOCKSinit’; expected 0, have 1
>    33 |         SOCKSinit("ruby");
>       |         ^~~~~~~~~ ~~~~~~
> In file included from sockssocket.c:11:
> rubysocket.h:293:6: note: declared here
>   293 | void SOCKSinit();
>       |      ^~~~~~~~~

Signed-off-by: Z. Liu <zhixu.liu@gmail.com>

diff --git a/ext/socket/rubysocket.h b/ext/socket/rubysocket.h
index 54a5381da4..dcafbe24e3 100644
--- a/ext/socket/rubysocket.h
+++ b/ext/socket/rubysocket.h
@@ -292,8 +292,8 @@ extern VALUE rb_eResolution;
 #ifdef SOCKS
 extern VALUE rb_cSOCKSSocket;
 #  ifndef SOCKS5
-void SOCKSinit();
-int Rconnect();
+void SOCKSinit(char *);
+int Rconnect(int, const struct sockaddr *, socklen_t);
 #  endif
 #endif
 
-- 
2.49.1