model: Fix original Contest Store to compile in new environment
diff --git a/model/ndn-common.hpp b/model/ndn-common.hpp
index 6489981..97e722a 100644
--- a/model/ndn-common.hpp
+++ b/model/ndn-common.hpp
@@ -31,12 +31,18 @@
#include <ndn-cxx/data.hpp>
#include <ndn-cxx/security/key-chain.hpp>
+#include <ndn-cxx/util/time.hpp>
+
namespace ns3 {
namespace ndn {
using ::ndn::Name;
namespace name = ::ndn::name;
+namespace time = ::ndn::time;
+
+using ::ndn::Exclude;
+
using std::shared_ptr;
using std::make_shared;