$OpenBSD$
--- src/m_alloc.cpp.orig	Sun Nov  6 21:40:35 2011
+++ src/m_alloc.cpp	Sun Nov  6 21:43:46 2011
@@ -39,7 +39,7 @@
 #include <stdlib.h>
 #include <malloc/malloc.h>
 #else
-#include <malloc.h>
+#include <stdlib.h>
 #endif
 
 #include "i_system.h"
@@ -50,13 +50,7 @@
 #define _malloc_dbg(s,b,f,l)	malloc(s)
 #define _realloc_dbg(p,s,b,f,l)	realloc(p,s)
 #endif
-#if defined(__APPLE__)
-#define _msize(p)				malloc_size(p)
-#elif defined(__sun)
 #define _msize(p)				(*((size_t*)(p)-1))
-#elif !defined(_WIN32)
-#define _msize(p)				malloc_usable_size(p)	// from glibc/FreeBSD
-#endif
 
 #ifndef _DEBUG
 #if !defined(__sun)