diff -urN linux-2.6.21.1.old/include/linux/stddef.h linux-2.6.21.1.dev/include/linux/stddef.h
--- linux-2.6.21.1.old/include/linux/stddef.h	2007-04-27 23:49:26.000000000 +0200
+++ linux-2.6.21.1.dev/include/linux/stddef.h	2007-05-26 21:29:46.108898864 +0200
@@ -16,6 +16,7 @@
 	false	= 0,
 	true	= 1
 };
+#endif /* __KERNEL__ */
 
 #undef offsetof
 #ifdef __compiler_offsetof
@@ -23,6 +24,5 @@
 #else
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 #endif
-#endif /* __KERNEL__ */
 
 #endif