patch taken from sabotage linux -- https://github.com/rofl0r/sabotage

--- util-linux-2.23.2.orig/text-utils/hexdump.h	2013-07-30 10:39:26.000000000 +0200
+++ util-linux-2.23.2/text-utils/hexdump.h	2013-08-14 12:44:31.000000000 +0200
@@ -33,6 +33,7 @@
  *	@(#)hexdump.h	5.4 (Berkeley) 6/1/90
  */
 
+#include <sys/types.h>
 typedef struct _pr {
 	struct _pr *nextpr;		/* next print unit */
 #define	F_ADDRESS	0x001		/* print offset */
