21c13c0886e814980d7663bb88b0d8fc905adb93
This option recursively deletes build and install directories, but preserves FGData if present (FGData is in <base_dir>/install/flightgear/fgdata, hence the need to take special care of it). There is currently no way to trigger this cleanup routine whithout pretending to act on at least one component, since "no components specified" implies "SIMGEAR FGFS DATA". That said, using -pn -dn -rn -cn with one of the components you already have should be close enough to "only do the cleanup".
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