diff -urN libsbsms-2.0.1.old/src/buffer.h libsbsms-2.0.1/src/buffer.h
--- libsbsms-2.0.1.old/src/buffer.h	2012-12-08 18:43:46.772667486 +0100
+++ libsbsms-2.0.1/src/buffer.h	2012-12-08 18:44:04.677668212 +0100
@@ -2,6 +2,7 @@
 #ifndef BUFFER_H
 #define BUFFER_H
 
+#include <stdlib.h>
 #include "sbsms.h"
 #include "grain.h"
 #include <list>