core: time::Duration, time:Point, time::now

refs #1148

Change-Id: I19c3d2f9b638797a6a36ce41a98be4463b4b7a2d
diff --git a/daemon/common.hpp b/daemon/common.hpp
index 05553b6..0dd2e7e 100644
--- a/daemon/common.hpp
+++ b/daemon/common.hpp
@@ -7,6 +7,8 @@
 #ifndef NFD_COMMON_HPP
 #define NFD_COMMON_HPP
 
+#include "config.hpp"
+
 #include <ndn-cpp-dev/interest.hpp>
 #include <ndn-cpp-dev/data.hpp>