user/src/com/google/gwt/core/XSLinker.gwt.xml

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<!-- Copyright 2009 Google Inc.                                             -->
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<!-- Defines the cross-site linker   -->
<module type="fileset">
  <define-linker name="xs" class="com.google.gwt.core.linker.XSLinker" />

  <replace-with class="com.google.gwt.core.client.impl.CrossSiteLoadingStrategy">
    <when-type-is
      class="com.google.gwt.core.client.impl.AsyncFragmentLoader.LoadingStrategy" />
    <when-linker-added name="xs" />
  </replace-with>

  <set-property name="compiler.predeclare.cross.fragment.references" value="true">
    <when-linker-added name="xs" />
  </set-property>
</module>