core: unify version string

refs #2671

Change-Id: I88a58a500a43635cc8698c4bf444723d6e713590
diff --git a/tools/peek/ndn-peek.cpp b/tools/peek/ndn-peek.cpp
index 8f79a61..7bc8dae 100644
--- a/tools/peek/ndn-peek.cpp
+++ b/tools/peek/ndn-peek.cpp
@@ -48,11 +48,7 @@
  * @author Jerald Paul Abraham <jeraldabraham@email.arizona.edu>
  */
 
-#include "version.hpp"
-
-#include <boost/noncopyable.hpp>
-
-#include <ndn-cxx/face.hpp>
+#include "core/version.hpp"
 
 namespace ndn {
 namespace peek {
@@ -282,7 +278,7 @@
       program.setTimeout(atoi(optarg));
       break;
     case 'V':
-      std::cout << NFD_VERSION_BUILD_STRING << std::endl;
+      std::cout << "ndnpeek " << tools::VERSION << std::endl;
       return 0;
     default:
       program.usage();