Remove all 2.0 pkgdefs in symbian4 and rename all 3.0 pkgdefs to package_definition.xml
<?xml version="1.0" encoding="UTF-8"?>
<SystemDefinition schema="3.0.0" xmlns:qt="http://www.nokia.com/qt">
<package id="browserui" name="Browser UI" levels="utils support ui">
<collection id="browserui_info" name="Browser UI Info" level="ui">
<component id="browserui_build" name="Bookmarks Engine Build" introduced="^4">
<unit bldFile="." qt:proFile="browserui.pro" qt:qmakeArgs=""what+=plat_101""/>
</component>
</collection>
</package>
</SystemDefinition>