Always build in C++11 mode

refs: #1930

Change-Id: Iedad4a814e5c7e6a5486f2f7e16c45c356131792
diff --git a/nsync/sync-logic-event-container.h b/nsync/sync-logic-event-container.h
index ebab72a..11dd29a 100644
--- a/nsync/sync-logic-event-container.h
+++ b/nsync/sync-logic-event-container.h
@@ -17,7 +17,7 @@
  *
  * Author: Zhenkai Zhu <zhenkai@cs.ucla.edu>
  *         Chaoyi Bian <bcy@pku.edu.cn>
- *	   Alexander Afanasyev <alexander.afanasyev@ucla.edu>
+ *         Alexander Afanasyev <alexander.afanasyev@ucla.edu>
  */
 
 #ifndef SYNC_LOGIC_EVENT_CONTAINER_H
@@ -25,7 +25,6 @@
 
 #include "sync-event.h"
 
-#include <boost/function.hpp>
 #include <boost/date_time/posix_time/posix_time_types.hpp>
 
 #include <boost/multi_index_container.hpp>
@@ -49,7 +48,7 @@
     , event (_event)
     , lbl (_label)
   { }
-  
+
   boost::system_time time;
   Event event;
   uint32_t lbl;