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The QBLDSYS is "an IBM-internal library that provides the capability to build the OS and LPPs; there should be an expectation, barring any radically daft changes, that a library by that name would never exist on a customer system".[1]

There is also a (presumably related) library called QBLDSYSR, various references to which may be found through a web search; how exactly QBLDSYSR relates to QBLDSYS is unclear.


  1. Original article(s) in the midrange archive: [1]