diff -r 1c978b5bcc65 -r 05b34170866b lemon/base.cc
--- a/lemon/base.cc	Mon Mar 18 17:41:19 2013 +0100
+++ b/lemon/base.cc	Mon Mar 18 18:48:58 2013 +0100
@@ -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