[MacPorts] #57037: gnuradio: Build failure on macOS High Sierra 10.13.6

[MacPorts]

#57037: gnuradio: Build failure on macOS High Sierra 10.13.6
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  Reporter:  jht15   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:          |
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Comment (by mf2k):

 In the future, please fill in the Port field and add the port
 maintainer(s) to Cc ({{{port info --maintainers gnuradio}}}), if any.

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Ticket URL: <https://trac.macports.org/ticket/57037#comment:1>
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