--- libhfsp/src/os.c.orig	Sat Jan 29 06:23:27 2011
+++ libhfsp/src/os.c	Sat Jan 29 06:24:04 2011
@@ -46,6 +46,7 @@ int fstat(int, struct stat *);
 # endif
 
 # include <stdio.h>
+# include <stdlib.h>
 
 
 # include <errno.h>