https://git.ruby-lang.org/ruby.git/commit/?id=701001e36e

From 701001e36ea99f0c253eeb0721706af77de0ffdd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 12 Mar 2021 19:28:17 +0900
Subject: Removed an unused declaration

---
 dln_find.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/dln_find.c b/dln_find.c
index 6fe847e..96e06d3 100644
--- a/dln_find.c
+++ b/dln_find.c
@@ -23,10 +23,6 @@ https://github.com/ruby/ruby/blob/trunk/dln_find.c#L23
 # include <stdlib.h>
 #endif
 
-#ifdef USE_DLN_A_OUT
-char *dln_argv0;
-#endif
-
 #if defined(HAVE_ALLOCA_H)
 #include <alloca.h>
 #endif
-- 
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