[MacPorts] #62708: tmux crashes when building with macOS SDK 11.0 on macOS 10.15

[MacPorts]

#62708: tmux crashes when building with macOS SDK 11.0 on macOS 10.15
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  Reporter:  tgyurci  |      Owner:  tessus
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  tmux     |
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Comment (by tgyurci):

 I have installed Command Line Tools, so `port` could find the 10.15 SDK
 from it.  Using the corresponding SDK for the base OS, `tmux` has been
 built and working without crash.

 I thought that it is supported to target 10.15 with 11.0 SDK, are there
 any "official" intention about this by MacPorts?

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Ticket URL: <https://trac.macports.org/ticket/62708#comment:5>
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