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Taken from: https://github.com/mariusmuja/flann/commit/895f31624f58ed56f29b24b9abcaa52688dea100

From 895f31624f58ed56f29b24b9abcaa52688dea100 Mon Sep 17 00:00:00 2001
From: xantares <xantares09@hotmail.com>
Date: Fri, 29 Aug 2014 16:14:28 +0200
Subject: [PATCH] fix mingw x86_64 build

diff --git a/src/cpp/flann/util/serialization.h b/src/cpp/flann/util/serialization.h
--- a/src/cpp/flann/util/serialization.h
+++ b/src/cpp/flann/util/serialization.h
@@ -86,6 +86,7 @@
 BASIC_TYPE_SERIALIZER(unsigned int);
 BASIC_TYPE_SERIALIZER(long);
 BASIC_TYPE_SERIALIZER(unsigned long);
+BASIC_TYPE_SERIALIZER(unsigned long long);
 BASIC_TYPE_SERIALIZER(float);
 BASIC_TYPE_SERIALIZER(double);
 BASIC_TYPE_SERIALIZER(bool);