Fix compilation with Boost 1.65.0
Change-Id: Ib88b7e13bddb1728dd882c086e97edffdd696f0d
Refs: #4258
diff --git a/core/privilege-helper.cpp b/core/privilege-helper.cpp
index ba3da78..b0ca116 100644
--- a/core/privilege-helper.cpp
+++ b/core/privilege-helper.cpp
@@ -1,6 +1,6 @@
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
-/**
- * Copyright (c) 2014-2015, Regents of the University of California,
+/*
+ * Copyright (c) 2014-2017, Regents of the University of California,
* Arizona Board of Regents,
* Colorado State University,
* University Pierre & Marie Curie, Sorbonne University,
@@ -29,6 +29,8 @@
#include <pwd.h>
#include <grp.h>
+#include <sstream>
+
namespace nfd {
NFD_LOG_INIT("PrivilegeHelper");