Index: configure.in
===================================================================
--- configure.in	(revision 38094)
+++ configure.in	(working copy)
@@ -1079,6 +1079,8 @@ if test "$GCC" = yes; then
 			__sync_lock_test_and_set(&atomic_var, 1);
 			__sync_fetch_and_add(&atomic_var, 1);
 			__sync_fetch_and_sub(&atomic_var, 1);
+			__sync_or_and_fetch(&atomic_var, 1);
+			__sync_val_compare_and_swap(&atomic_var, 1, 1);
 		    ],
 		    [rb_cv_gcc_atomic_builtins=yes],
 		    [rb_cv_gcc_atomic_builtins=no])])