Remove all 2.0 pkgdefs in symbian4 and rename all 3.0 pkgdefs to package_definition.xml
<SystemDefinition schema="3.0.0" xmlns:qt="http://www.nokia.com/qt">
<package id="settingsuis" name="Settings UIs" levels="plugin ui">
<collection id="controlpanelplugins" name="Control Panel Plugins" level="plugin">
<component id="themeplugin" filter="s60" name="Theme Plugin" introduced="^4">
<unit bldFile="controlpanelplugins/themeplugin" qt:proFile="themeplugin.pro" qt:qmakeArgs="-r -config rom"/>
</component>
</collection>
<collection id="controlpanelui" name="Control Panel UI" level="ui">
<!-- collection is really a component, move down a dir -->
<component id="controlpanelui_build" filter="s60" name="Control Panel UI Build" introduced="^4">
<unit bldFile="controlpanelui" qt:proFile="controlpanelui.pro" qt:qmakeArgs="-r -config rom"/>
</component>
</collection>
</package>
</SystemDefinition>