--- src/dbg_stack_trace/stack.cpp.orig	2009-10-02 11:13:13.375805628 +0200
+++ src/dbg_stack_trace/stack.cpp	2009-10-02 11:15:14.445801771 +0200
@@ -8,6 +8,7 @@
 #include <ostream>
 #include <iostream>
 #include <cassert>
+#include <cstdlib>
 
 #include "stack.hpp"