https://git.ruby-lang.org/ruby.git/commit/?id=1921500511

From 192150051144c0242ee44df26952dfe31b83cac2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 6 May 2021 00:29:20 +0900
Subject: PAGE_SIZE is used only when mmap is available

---
 gc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gc.c b/gc.c
index ee9fa49..c899228 100644
--- a/gc.c
+++ b/gc.c
@@ -834,7 +834,11 @@ enum { https://github.com/ruby/ruby/blob/trunk/gc.c#L834
 #define HEAP_PAGE_SIZE HEAP_PAGE_ALIGN
 #ifdef USE_MMAP_ALIGNED_ALLOC
 # define Init_use_mmap_aligned_alloc() (void)0
+#elif !defined(HAVE_MMAP)
+# define USE_MMAP_ALIGNED_ALLOC 0
+# define Init_use_mmap_aligned_alloc() (void)0
 #elif defined(PAGE_MAX_SIZE) && (PAGE_MAX_SIZE <= HEAP_PAGE_SIZE)
+/* PAGE_SIZE <= HEAP_PAGE_SIZE */
 # define USE_MMAP_ALIGNED_ALLOC 1
 # define Init_use_mmap_aligned_alloc() (void)0
 #else
-- 
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