--- linux-2.6.19/include/linux/audit.h
+++ linux-2.6.19/include/linux/audit.h
@@ -24,6 +24,7 @@
 #ifndef _LINUX_AUDIT_H_
 #define _LINUX_AUDIT_H_
 
+#include <linux/types.h>
 #include <linux/elf-em.h>
 
 /* The netlink messages for the audit system is divided into blocks: