From d224bfdc3252913ac635be0bf28173c659a10687 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 24 Apr 2024 17:13:25 +0900
Subject: [PATCH] `redblack_cache_ancestors` is enabled only when `mmap` is
 available

---
 shape.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/shape.c b/shape.c
index 68c74034e7..0f9e3d54fa 100644
--- a/shape.c
+++ b/shape.c
@@ -118,6 +118,7 @@ redblack_value(redblack_node_t * node)
     return (rb_shape_t *)((uintptr_t)node->value & (((uintptr_t)-1) - 1));
 }
 
+#ifdef HAVE_MMAP
 static redblack_id_t
 redblack_id_for(redblack_node_t * node)
 {
@@ -292,6 +293,7 @@ redblack_insert(redblack_node_t * tree, ID key, rb_shape_t * value)
         return root;
     }
 }
+#endif
 
 rb_shape_tree_t *rb_shape_tree_ptr = NULL;