[MacPorts] #70655: Qt6-qtbase, missing #include and an issue for (some) older systems

[MacPorts]

#70655: Qt6-qtbase, missing #include and an issue for (some) older systems
-------------------------+---------------------------------
  Reporter:  Gandoon     |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.10.1
Resolution:              |   Keywords:
      Port:  qt6-qtbase  |
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Comment (by reneeotten):

 @Gandoon just to be clear: if you're willing/able to patch Qt6 in such a
 way that it will function on macOS 10.15 that would be certainly much
 appreciated. Patches and improvements to that end will certainly be
 reviewed/accepted in MacPorts; there are many packages that are able to be
 build with MacPorts for older OS versions than officially supported by
 upstream. In fact, as I said earlier Marcus has been doing a lot of that
 for the Qt5/Qt6 ports. It's just that I lack the time/interest/knowledge
 to do so, and my ability to test things is limited as I don't have any
 older OS installed/available.

 In short, I didn't intend at all to discourage you to try to work on this!

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Ticket URL: <https://trac.macports.org/ticket/70655#comment:6>
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