$OpenBSD: patch-src_memory_c,v 1.2 2014/11/17 15:23:12 landry Exp $
https://github.com/collectd/collectd/pull/808
--- src/memory.c.orig	Thu Jul 10 07:50:50 2014
+++ src/memory.c	Thu Jul 10 07:52:54 2014
@@ -30,6 +30,7 @@
 #ifdef HAVE_SYS_SYSCTL_H
 # include <sys/sysctl.h>
 #endif
+#include <sys/vmmeter.h>
 
 #ifdef HAVE_MACH_KERN_RETURN_H
 # include <mach/kern_return.h>
