Index: yaml-cpp/src/ptr_vector.h
===================================================================
--- yaml-cpp.orig/src/ptr_vector.h
+++ yaml-cpp/src/ptr_vector.h
@@ -8,6 +8,7 @@
 #include "yaml-cpp/noncopyable.h"
 #include <memory>
 #include <vector>
+#include <cstdlib>
 
 namespace YAML {
 	
Index: yaml-cpp/src/ptr_stack.h
===================================================================
--- yaml-cpp.orig/src/ptr_stack.h
+++ yaml-cpp/src/ptr_stack.h
@@ -8,6 +8,7 @@
 #include "yaml-cpp/noncopyable.h"
 #include <memory>
 #include <vector>
+#include <cstdlib>
 
 template <typename T>
 class ptr_stack: private YAML::noncopyable