Slim down `common.hpp`
Change-Id: Ic9843a1b9ffc5b5b1fa6062c8250ba28c6aaa898
diff --git a/tools/dump/ndndump.hpp b/tools/dump/ndndump.hpp
index 83b0710..8a10def 100644
--- a/tools/dump/ndndump.hpp
+++ b/tools/dump/ndndump.hpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
- * Copyright (c) 2011-2022, Regents of the University of California.
+ * Copyright (c) 2011-2024, Regents of the University of California.
*
* This file is part of ndn-tools (Named Data Networking Essential Tools).
* See AUTHORS.md for complete list of ndn-tools authors and contributors.
@@ -23,6 +23,8 @@
#include "core/common.hpp"
#include <pcap.h>
+
+#include <optional>
#include <regex>
#ifdef HAVE_BSD_TCPHDR