diff -r cd72eae05bdf -r 3c00344f49c9 lemon/base.cc
--- a/lemon/base.cc	Mon Jul 16 16:21:40 2018 +0200
+++ b/lemon/base.cc	Wed Oct 17 19:14:07 2018 +0200
@@ -2,7 +2,7 @@
  *
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) 2003-2009
+ * Copyright (C) 2003-2013
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
  *
@@ -21,6 +21,7 @@
 
 #include<lemon/tolerance.h>
 #include<lemon/core.h>
+#include<lemon/time_measure.h>
 namespace lemon {
 
   float Tolerance<float>::def_epsilon = static_cast<float>(1e-4);
@@ -31,4 +32,6 @@
   const Invalid INVALID = Invalid();
 #endif
 
+  TimeStamp::Format TimeStamp::_format = TimeStamp::NORMAL;
+
 } //namespace lemon