Index: kernel/generic/include/adt/avl.h
===================================================================
--- kernel/generic/include/adt/avl.h	(revision 525c5ac5b9fa9910f16d49c50efb5ca3369bc0e6)
+++ kernel/generic/include/adt/avl.h	(revision e29e44bfc60bad156c2207d4a15f29c1a1645d85)
@@ -37,4 +37,5 @@
 
 #include <stdbool.h>
+#include <stddef.h>
 #include <typedefs.h>
 #include <trace.h>
Index: kernel/generic/include/panic.h
===================================================================
--- kernel/generic/include/panic.h	(revision 525c5ac5b9fa9910f16d49c50efb5ca3369bc0e6)
+++ kernel/generic/include/panic.h	(revision e29e44bfc60bad156c2207d4a15f29c1a1645d85)
@@ -37,4 +37,5 @@
 
 #include <stdbool.h>
+#include <stddef.h>
 #include <typedefs.h>
 #include <print.h>
Index: kernel/generic/include/stddef.h
===================================================================
--- kernel/generic/include/stddef.h	(revision e29e44bfc60bad156c2207d4a15f29c1a1645d85)
+++ kernel/generic/include/stddef.h	(revision e29e44bfc60bad156c2207d4a15f29c1a1645d85)
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2006 Josef Cejka
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup generic
+ * @{
+ */
+/** @file
+ */
+
+#ifndef KERN_STDDEF_H_
+#define KERN_STDDEF_H_
+
+#include <arch/types.h>
+
+typedef native_t ptrdiff_t;
+
+#ifndef NULL
+	#define NULL  ((void *) 0)
+#endif
+
+#define offsetof(type,member) ((size_t) &(((type *) 0)->member))
+
+#endif
+
+/** @}
+ */
Index: kernel/generic/include/typedefs.h
===================================================================
--- kernel/generic/include/typedefs.h	(revision 525c5ac5b9fa9910f16d49c50efb5ca3369bc0e6)
+++ kernel/generic/include/typedefs.h	(revision e29e44bfc60bad156c2207d4a15f29c1a1645d85)
@@ -40,6 +40,4 @@
 #include <arch/types.h>
 
-#define NULL  ((void *) 0)
-
 typedef struct {
 	volatile atomic_count_t count;
@@ -57,6 +55,4 @@
 typedef volatile uint32_t ioport32_t;
 
-typedef native_t ptrdiff_t;
-
 #ifdef __32_BITS__
 
Index: kernel/generic/src/printf/printf_core.c
===================================================================
--- kernel/generic/src/printf/printf_core.c	(revision 525c5ac5b9fa9910f16d49c50efb5ca3369bc0e6)
+++ kernel/generic/src/printf/printf_core.c	(revision e29e44bfc60bad156c2207d4a15f29c1a1645d85)
@@ -41,4 +41,5 @@
 #include <stdarg.h>
 #include <macros.h>
+#include <stddef.h>
 #include <str.h>
 #include <arch.h>