[MacPorts] #63099: Selfupdate failure to 2.7.1: /usr/bin/cc can't link -lSystem

[MacPorts]

#63099: Selfupdate failure to 2.7.1: /usr/bin/cc can't link -lSystem
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  Reporter:  gallafent   |      Owner:  (none)
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.7.1
Resolution:  worksforme  |   Keywords:
      Port:              |
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Comment (by ryandesign):

 I don't think you should still have MacOSX11.0.sdk at that point, and if
 you do, you should probably remove it.

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Ticket URL: <https://trac.macports.org/ticket/63099#comment:5>
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