diff -up xarchon-0.50/src/Genetic.hpp~ xarchon-0.50/src/Genetic.hpp
--- xarchon-0.50/src/Genetic.hpp~	2008-01-11 22:40:09.000000000 +0100
+++ xarchon-0.50/src/Genetic.hpp	2008-01-11 22:40:09.000000000 +0100
@@ -2,6 +2,7 @@
 #define GENETIC_HPP
 
 #include <list>
+#include <stdlib.h>
 using namespace std;
 
 /* **********************************************
diff -up xarchon-0.50/src/Xarchon_Problem.cpp~ xarchon-0.50/src/Xarchon_Problem.cpp
--- xarchon-0.50/src/Xarchon_Problem.cpp~	2008-01-11 22:40:27.000000000 +0100
+++ xarchon-0.50/src/Xarchon_Problem.cpp	2008-01-11 22:40:27.000000000 +0100
@@ -1,3 +1,4 @@
+#include <string.h>
 #include "Xarchon_Problem.hpp"
 #include "Xarchon_Interface.hpp"