Index: src/runtime/runtime.h
==================================================================
--- src/runtime/runtime.h
+++ src/runtime/runtime.h
@@ -29,11 +29,11 @@
 	Class superclass;
 	const char *name;
 	unsigned long version;
 	unsigned long info;
 	unsigned long instance_size;
-	void *ivars;
+	struct objc_ivar_list *ivars;
 	struct objc_method_list *methodlist;
 	struct objc_sparsearray *dtable;
 	Class *subclass_list;
 	void *sibling_class;
 	struct objc_protocol_list *protocols;
@@ -73,10 +73,21 @@
 	const char *class_name;
 	struct objc_method_list *instance_methods;
 	struct objc_method_list *class_methods;
 	struct objc_protocol_list *protocols;
 };
+
+struct objc_ivar {
+	const char *name;
+	const char *type;
+	unsigned offset;
+};
+
+struct objc_ivar_list {
+	unsigned count;
+	struct objc_ivar ivars[1];
+};
 
 #ifdef __OBJC__
 @interface Protocol
 {
 @public