prefs/obr.xml

<?xml version="1.0" encoding="UTF-8"?>
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<obr>
    <require extend="false" 
             filter="(service=org.osgi.service.log.LogService)" 
             multiple="false"
             name="service"
             optional="true">Import Service org.osgi.service.log.LogService</require>
    <require extend="false" 
             filter="(service=org.apache.felix.prefs.BackingStore)" 
             multiple="false" 
             name="service" 
             optional="true">Import Service org.apache.felix.prefs.BackingStore</require>
    <capability name="service">
        <p n="service" v="org.osgi.service.prefs.PreferencesService"/>
    </capability>
</obr>