Index: uspace/lib/c/include/stddef.h
===================================================================
--- uspace/lib/c/include/stddef.h	(revision c072a292c19db94ad89515ef948e5fabe05dc9f1)
+++ uspace/lib/c/include/stddef.h	(revision 490e21b9ccf40a2a981b687963bd8eb63ffaaed6)
@@ -42,4 +42,5 @@
 #endif
 
+#define offsetof(type,member) ((size_t) &(((type *) 0)->member))
 
 #endif