user/src/com/google/gwt/rpc/RPC.gwt.xml

<module>
  <inherits name="com.google.gwt.core.Core" />
  <inherits name="com.google.gwt.user.RemoteService" />

  <source path="client" />
  <super-source path="super" />

  <define-linker name="clientOracleLinker"
    class="com.google.gwt.rpc.linker.ClientOracleLinker" />
  <add-linker name="clientOracleLinker" />

  <define-property name="gwt.rpc.hijackLegacyInterface" values="true,false" />
  <set-property name="gwt.rpc.hijackLegacyInterface" value="false" />

  <generate-with class="com.google.gwt.rpc.rebind.RpcServiceGenerator">
    <any>
      <when-type-assignable class="com.google.gwt.rpc.client.RpcService" />
      <all>
        <when-type-assignable class="com.google.gwt.user.client.rpc.RemoteService" />
        <when-property-is name="gwt.rpc.hijackLegacyInterface"
          value="true" />
      </all>
    </any>
  </generate-with>
</module>