$OpenBSD$
--- src/od-generic/memory.c.orig	Sat May 21 05:41:06 2011
+++ src/od-generic/memory.c	Sat May 21 05:43:38 2011
@@ -11,6 +11,7 @@
 #include "sysdeps.h"
 
 #include "options.h"
+#include <sys/param.h>
 #include <sys/sysctl.h>
 #include "include/memory.h"
 
@@ -27,7 +28,7 @@
 #define IPC_STAT    0x08
 
 #if !defined(__FreeBSD__)
-typedef int key_t;
+/* typedef int key_t; */
 #endif
 
 /* One shmid data structure for each shared memory segment in the system. */