2.1/user/src/com/google/gwt/layout/Layout.gwt.xml

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<!-- Copyright 2009 Google Inc.                                             -->
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<!-- http://www.apache.org/licenses/LICENSE-2.0                             -->
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<module>
  <inherits name="com.google.gwt.core.Core"/>
  <inherits name="com.google.gwt.user.UserAgent"/>
  <inherits name="com.google.gwt.dom.DOM"/>
  <inherits name="com.google.gwt.animation.Animation"/>

  <replace-with class="com.google.gwt.layout.client.LayoutImplIE8">
    <when-type-is class="com.google.gwt.layout.client.LayoutImpl"/>
    <when-property-is name="user.agent" value="ie8"/>
  </replace-with>

  <replace-with class="com.google.gwt.layout.client.LayoutImplIE6">
    <when-type-is class="com.google.gwt.layout.client.LayoutImpl"/>
    <when-property-is name="user.agent" value="ie6"/>
  </replace-with>
</module>