[MacPorts] #65688: maildrop @3.0.0 build fails on at least Mojave and Catalina

[MacPorts]

#65688: maildrop @3.0.0 build fails on at least Mojave and Catalina
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  Reporter:  rlhamil   |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.2
Resolution:            |   Keywords:
      Port:  maildrop  |
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Comment (by ryandesign):

 So maildrop needs C++11 to match its dependency courier-unicode.

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Ticket URL: <https://trac.macports.org/ticket/65688#comment:1>
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