[MacPorts] #53995: nmap @7.40 fails to build with libc++

[MacPorts]

#53995: nmap @7.40 fails to build with libc++
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  Reporter:  1-61803  |      Owner:  danielluke
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  nmap     |
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Comment (by 1-61803):

 `sudo port install nmap configure.cxxflags="-stdlib=libc++"
 configure.cxx="clang++ -stdlib=libc++"` builds the port.

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Ticket URL: <https://trac.macports.org/ticket/53995#comment:3>
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