https://git.ruby-lang.org/ruby.git/commit/?id=4f907a80f0

From 4f907a80f04292e472d2eea660c4f5c0cb62e00f Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 9 Dec 2020 11:32:18 +0900
Subject: Removed declaration of non-existent symbol


diff --git a/include/ruby/internal/intern/process.h b/include/ruby/internal/intern/process.h
index bcb5a7e..8c7570e 100644
--- a/include/ruby/internal/intern/process.h
+++ b/include/ruby/internal/intern/process.h
@@ -28,8 +28,6 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/intern/process.h#L28
 RBIMPL_SYMBOL_EXPORT_BEGIN()
 
 /* process.c */
-RUBY_EXTERN void (* rb_socket_before_fork_func)();
-
 void rb_last_status_set(rb_pid_t pid, int status, int error);
 VALUE rb_last_status_get(void);
 int rb_proc_exec(const char*);
-- 
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