[MacPorts] #71474: Build failure on macOS 15 (wrong `CMAKE_OSX_SYSROOT`)

[MacPorts]

#71474: Build failure on macOS 15 (wrong `CMAKE_OSX_SYSROOT`)
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  Reporter:  emmyoh  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  soxr    |
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Comment (by ryandesign):

 I see several different errors in the log from several different attempts
 made over the course of two years. Let's make sure we're investigating the
 right error. Please `sudo port clean soxr`, then try again, then attach
 the new main.log.

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Ticket URL: <https://trac.macports.org/ticket/71474#comment:2>
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