@@ -255,10 +255,11 @@
 extern void objc_dtable_free(struct objc_dtable *_Nonnull);
 extern void objc_dtable_cleanup(void);
 extern void objc_init_static_instances(struct objc_symtab *_Nonnull);
 extern void objc_forget_pending_static_instances(void);
 extern void objc_zero_weak_references(id _Nonnull);
+extern Class _Nullable object_getTaggedPointerClass(id _Nonnull);
 #ifdef OF_HAVE_THREADS
 extern void objc_global_mutex_lock(void);
 extern void objc_global_mutex_unlock(void);
 extern void objc_global_mutex_free(void);
 #else
@@ -290,11 +291,11 @@
     defined(OF_MIPS64_N64) || defined(OF_MIPS) || \
     defined(OF_SPARC64) || defined(OF_SPARC)
 #  define OF_ASM_LOOKUP
 # endif
 #elif defined(OF_MACH_O)
-# if defined(OF_X86_64) || defined(OF_POWERPC)
+# if defined(OF_X86_64)
 #  define OF_ASM_LOOKUP
 # endif
 #elif defined(OF_WINDOWS)
 # if defined(OF_X86_64) || defined(OF_X86)
 #  define OF_ASM_LOOKUP