B4J Question "Standard" Libraries?


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Having installed the new Beta-IDE in a separate folder I get the error: "Serial" is missing. There are about 30 libs installed in the Beta-IDE libraries folder, but not jserial. So, first I thought that jserial was belonging to the core libraries of the "old" installation. However, looking into the "normal" B4J folder (existing for a while and might manually have received additions) I find jserial there in the libraries folder.
So, my question is, by which rule are libraries in the "libraries" folder being selected, i.e. included in the installation program?