Carla/data/macos/package.xml

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<installer-gui-script minSpecVersion="1">
    <title>Carla Plugin</title>
    <domains enable_anywhere="false" enable_currentUserHome="false" enable_localSystem="true" />
    <options customize="always" hostArchitectures="x86_64" require-scripts="false" rootVolumeOnly="true" />
    <pkg-ref id="studio.kx.carla" />
    <choice id="studio.kx.carla.lv2" title="LV2 plugin" description='Carla as LV2 plugin' visible="true">
        <pkg-ref id="studio.kx.carla.lv2" version="0">carla-lv2.pkg</pkg-ref>
    </choice>
    <choice id="studio.kx.carla.vst2" title="VST2 plugin" description='Carla as VST2 plugin (VST "Shell")' visible="true">
        <pkg-ref id="studio.kx.carla.vst2fx" version="0">carla-vst2fx.pkg</pkg-ref>
        <pkg-ref id="studio.kx.carla.vst2syn" version="0">carla-vst2syn.pkg</pkg-ref>
    </choice>
    <choices-outline>
       <line choice="studio.kx.carla.lv2"/>
       <line choice="studio.kx.carla.vst2"/>
    </choices-outline>
</installer-gui-script>