https://git.ruby-lang.org/ruby.git/commit/?id=adafa8105f

From adafa8105f58bddc05a6ca12314890e07cbf5f5b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sun, 16 May 2021 18:27:31 +0900
Subject: PAGE_SIZE is never used on msys/mingw

---
 gc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gc.c b/gc.c
index 8b36b6c..e36282b 100644
--- a/gc.c
+++ b/gc.c
@@ -871,7 +871,7 @@ static const bool USE_MMAP_ALIGNED_ALLOC = true; https://github.com/ruby/ruby/blob/trunk/gc.c#L871
 
 static bool use_mmap_aligned_alloc;
 # endif
-#else
+#elif !defined(__MINGW32__) && !defined(_WIN32)
 static const bool USE_MMAP_ALIGNED_ALLOC = false;
 #endif
 
-- 
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