[MacPorts] #61945: fldigi port fails to rebuild

[MacPorts]

#61945: fldigi port fails to rebuild
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  Reporter:  mouse07410  |      Owner:  ra1nb0w
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:
      Port:  fldigi      |
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Comment (by mouse07410):

 > Maybe we need to deny use of this compiler from Xcode 12.x

 **No!

 What you need to make it build-able is:
 - ensure {{{asciidoc}}} is at least v10.0.0a2 - otherwise you'll get
 {{{^M}}} in a few files
 - enforce {{{-std=c++11}}} - otherwise (e.g., with {{{-std=gnu++17}}}, as
 I usually have) you'll get {{{set_unexpected()}}} undefined
 - enforce {{{-mmacosx-version-min=10.11}}} or such, as this build fails
 with {{{-mmacosx-version-min=10.6}}} or whatever

 Then it builds fine with Xcode-12.4.

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Ticket URL: <https://trac.macports.org/ticket/61945#comment:23>
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