https://github.com/ros2-rust/ros2_rust/blob/27bc35584badf0406927b5d6c88625de2ef52580/rclrs/Cargo.toml#L29 I got failure building on `builtin_interfaces`. I [removed it ](https://github.com/iotpi/ros2_rust/commit/1399660123fac828cc82c1fd8fc5ee7408fbd2cd) then it is built successfully. I'm not sure why it is a dependency of rclrs.