https://git.ruby-lang.org/ruby.git/commit/?id=82513c7d71

From 82513c7d715c21c8045fd6420f79a3c4e40bd4ab Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@p...>
Date: Fri, 18 Feb 2022 09:30:08 -0500
Subject: Remove unused function declaration in dln.c

getenv is no longer used in dln.c.
---
 dln.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/dln.c b/dln.c
index 902f187283..3ebce48a45 100644
--- a/dln.c
+++ b/dln.c
@@ -72,10 +72,6 @@ void *xrealloc(); https://github.com/ruby/ruby/blob/trunk/dln.c#L72
 # include <unistd.h>
 #endif
 
-#ifndef _WIN32
-char *getenv();
-#endif
-
 #ifndef dln_loaderror
 static void
 dln_loaderror(const char *format, ...)
-- 
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