[MacPorts] #59232: fftw-3 does not configure with +gfortran (Catalina, Xcode 10.3, Macports-2.6.1)

[MacPorts]

#59232: fftw-3 does not configure with +gfortran (Catalina, Xcode 10.3,
Macports-2.6.1)
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  Reporter:  nombak  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  catalina
      Port:  fftw-3  |
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Comment (by cjones051073):

 gcc9 is fine on macOS 10.15 with Xcode 11.1.
 Using Xcode 10 is not supported, so yes please update then report back.

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Ticket URL: <https://trac.macports.org/ticket/59232#comment:3>
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