Index: yubico/examples/otp_async.rs
===================================================================
--- yubico.orig/examples/otp_async.rs	2024-06-08 20:19:47.000000000 +0200
+++ yubico/examples/otp_async.rs	2024-06-08 20:40:07.749753276 +0200
@@ -1,3 +1,5 @@
+#![cfg(feature="online-tokio")]
+
 extern crate futures;
 extern crate tokio;
 extern crate yubico;