[MacPorts] #59351: Cannot compile gfortran (or even libgcc7) under Catalina

[MacPorts]

#59351: Cannot compile gfortran (or even libgcc7) under Catalina
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  Reporter:  thepeteriley  |      Owner:  Chris Jones <jonesc@…>
      Type:  defect        |     Status:  closed
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:  fixed         |   Keywords:  catalina
      Port:  gcc7          |
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Comment (by cjones051073):

 thanks for the pointer. I've committed an update allowing these builds for
 Xcode 11.3+ on Darwin19 and newer.

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Ticket URL: <https://trac.macports.org/ticket/59351#comment:9>
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