diff -r 64c2641286df -r 55111a054b2e lemon/time_measure.h
--- a/lemon/time_measure.h	Fri Jan 23 16:30:05 2009 +0000
+++ b/lemon/time_measure.h	Sat Feb 07 15:30:04 2009 +0000
@@ -29,6 +29,7 @@
 #include <windows.h>
 #include <cmath>
 #else
+#include <unistd.h>
 #include <sys/times.h>
 #include <sys/time.h>
 #endif