[MacPorts] #61457: libtool: configure error: C compiler cannot create executables

[MacPorts]

#61457: libtool: configure error: C compiler cannot create executables
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  Reporter:  rseichter  |      Owner:  larryv
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:
      Port:  libtool    |
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Comment (by rseichter):

 It took a while until the command line tools were reinstalled, and after
 that I had to execute a hard power-down to get my Mac to reboot, but now a
 couple of builds are in progress (like glib2 and icu). Quite odd. I
 distiinctly remeber updating Xcode immediately before installing the Big
 Sur update.

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Ticket URL: <https://trac.macports.org/ticket/61457#comment:8>
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