[MacPorts] #61450: GSL @2.6: build fails after Mac OS Big Sur update

[MacPorts]

#61450: GSL @2.6: build fails after Mac OS Big Sur update
---------------------+--------------------
  Reporter:  mmphys  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:  bigsur
      Port:  gsl     |
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Changes (by mmphys):

 * Attachment "main.log" added.

 gsl port log

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Ticket URL: <https://trac.macports.org/ticket/61450>
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