From d2a5f72f73e0e4030b521086b13b8c8efaf9ca9e Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@symas.com>
Date: Sat, 16 Jan 2016 16:11:11 +0000
Subject: [PATCH] Fix --db-sync-mode on Windows64

only "fastest" mode was working, others would SEGV.
---
 external/db_drivers/liblmdb/mdb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/external/db_drivers/liblmdb/mdb.c b/external/db_drivers/liblmdb/mdb.c
index ae32c989..5d57f8b1 100644
--- a/external/db_drivers/liblmdb/mdb.c
+++ b/external/db_drivers/liblmdb/mdb.c
@@ -2429,7 +2429,7 @@ mdb_page_alloc(MDB_cursor *mc, int num, MDB_page **mp)
 			goto fail;
 	}
 #ifdef _WIN32
-	if (env->me_flags & MDB_WRITEMAP) {
+	if (!(env->me_flags & MDB_RDONLY)) {
 		void *p;
 		p = (MDB_page *)(env->me_map + env->me_psize * pgno);
 		p = VirtualAlloc(p, env->me_psize * num, MEM_COMMIT,