diff --git a/src/common.hpp b/src/common.hpp
new file mode 100644
index 0000000..8903f22
--- /dev/null
+++ b/src/common.hpp
@@ -0,0 +1,71 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * @author: Jeff Thompson <jefft0@remap.ucla.edu>
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_COMMON_HPP
+#define NDN_COMMON_HPP
+
+#include "ndn-cpp-config.h"
+#include <stdint.h>
+// TODO: Is stddef.h portable?
+#include <stddef.h>
+
+#include <vector>
+
+#if NDN_CPP_HAVE_CXX11
+
+#if (__cplusplus < 201103L)
+#error "NDN-CPP-DEV library is configured and compiled in C++11 mode, but the current compiler is not C++11 enabled"
+#endif
+
+#include <memory>
+namespace ndn { namespace ptr_lib = std; }
+
+// #if NDN_CPP_HAVE_STD_FUNCTION
+#include <functional>
+namespace ndn { namespace func_lib = std; }
+
+#else
+
+// #if NDN_CPP_HAVE_BOOST_SHARED_PTR
+#include <boost/shared_ptr.hpp>
+#include <boost/enable_shared_from_this.hpp>
+#include <boost/make_shared.hpp>
+namespace ndn { namespace ptr_lib = boost; }
+
+// #if NDN_CPP_HAVE_BOOST_FUNCTION
+#include <boost/function.hpp>
+#include <boost/bind.hpp>
+namespace ndn { namespace func_lib = boost; }
+
+#endif
+
+namespace ndn {
+
+/**
+ * A time interval represented as the number of milliseconds.
+ */
+typedef int64_t Milliseconds;
+   
+/**
+ * The calendar time represented as the number of milliseconds since 1/1/1970.
+ */
+typedef int64_t MillisecondsSince1970;
+
+/**
+ * Return the hex representation of the bytes in array.
+ * @param array The array of bytes.
+ * @return Hex string.
+ */
+std::string 
+toHex(const std::vector<uint8_t>& array);
+
+MillisecondsSince1970
+getNow();
+
+}
+
+#endif