The import com.google.gwt.user cannot be resolved

I am going through the GWT Tutorials, specifically the "Making Remote
Procedure Calls" tutorial, and I have created an interface with the
following provided code:

package com.google.gwt.sample.stockwatcher.client;

import com.google.gwt.user.client.rpc.RemoteService;
import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;

@RemoteServiceRelativePath("stockPrices")
public interface StockPriceService extends RemoteService {

StockPrice[] getPrices(String[] symbols);
}

I am getting the following errors:
The import com.google.gwt.user cannot be resolved
RemoteServiceRelativePath cannot be resolved to a type
RemoteService cannot be resolved to a type

I am using GWT 2.4.0, which I understand does not align with the
tutorial, but unfortunately I cannot think of how I should update the
provided code in the tutorial to 2.4. How can I fix the above code to
eliminate these errors? Thanks in advance for any help.

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