https://git.ruby-lang.org/ruby.git/commit/?id=fbe9b691bd

From fbe9b691bd4d5fc21e893e60cd026830b5e16a90 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 9 Jul 2021 08:52:35 +0900
Subject: Added missing declarations in readline.h bundled with macOS 10.13

---
 ext/readline/readline.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ext/readline/readline.c b/ext/readline/readline.c
index b804ae6..8d635fc 100644
--- a/ext/readline/readline.c
+++ b/ext/readline/readline.c
@@ -1918,6 +1918,9 @@ username_completion_proc_call(VALUE self, VALUE str) https://github.com/ruby/ruby/blob/trunk/ext/readline/readline.c#L1918
     return result;
 }
 
+#ifdef HAVE_RL_CATCH_SIGNALS
+RUBY_EXTERN int rl_catch_signals;
+#endif
 #ifdef HAVE_RL_CLEAR_SIGNALS
 RUBY_EXTERN int rl_clear_signals(void);
 #endif
-- 
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