https://git.ruby-lang.org/ruby.git/commit/?id=3d6fd162a4

From 3d6fd162a469f9bfa4afc696ef8b8d8536a38507 Mon Sep 17 00:00:00 2001
From: "Daisuke Fujimura (fd0)" <booleanlabel@g...>
Date: Sat, 16 Apr 2022 12:41:37 +0900
Subject: Undefine RUBY_DLN_CHECK_ABI on cygwin

---
 include/ruby/internal/abi.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/ruby/internal/abi.h b/include/ruby/internal/abi.h
index 98a63927c5..ed779f3558 100644
--- a/include/ruby/internal/abi.h
+++ b/include/ruby/internal/abi.h
@@ -26,7 +26,7 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/abi.h#L26
 
 /* Windows does not support weak symbols so ruby_abi_version will not exist
  * in the shared library. */
-#if defined(HAVE_FUNC_WEAK) && !defined(_WIN32) && !defined(__MINGW32__)
+#if defined(HAVE_FUNC_WEAK) && !defined(_WIN32) && !defined(__MINGW32__) && !defined(__CYGWIN__)
 # define RUBY_DLN_CHECK_ABI
 #endif
 
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