Always build in C++11 mode

refs: #1930

Change-Id: Iedad4a814e5c7e6a5486f2f7e16c45c356131792
diff --git a/src/adjacency-list.cpp b/src/adjacency-list.cpp
index 5c98ed8..3e535ee 100644
--- a/src/adjacency-list.cpp
+++ b/src/adjacency-list.cpp
@@ -22,8 +22,10 @@
  **/
 #include <algorithm>
 #include <ndn-cxx/common.hpp>
+
 #include "adjacency-list.hpp"
 #include "adjacent.hpp"
+#include "common.hpp"
 #include "nlsr.hpp"
 #include "logger.hpp"