[MacPorts] #58882: Python37 configure script segfaults in generate-posix-vars on macOS 10.15

[MacPorts]

#58882: Python37 configure script segfaults in generate-posix-vars on macOS 10.15
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  Reporter:  vdoublie  |      Owner:  jmroot
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  catalina
      Port:  python37  |
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Comment (by jmroot):

 Well, having coreutils installed made no difference here. So I guess we're
 back to the admittedly vague "beta pollution" hypothesis, unless someone
 can repro on a clean never-beta 10.15 installation.

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Ticket URL: <https://trac.macports.org/ticket/58882#comment:28>
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