[MacPorts] #49010: add new gcc5 variant as default compiler to ccpnmr-2.4.2

[MacPorts]

#49010: add new gcc5 variant as default compiler to ccpnmr-2.4.2
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  Reporter:  howarth.at.macports@…  |      Owner:  macports-tickets@…
      Type:  update                 |     Status:  new
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:  2.3.3
Resolution:                         |   Keywords:
      Port:  ccpnmr                 |
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Comment (by howarth.at.macports@…):

 The compiler Portgboup seems to be undocumented in
 https://guide.macports.org/#reference.portgroup so it is unclear what is
 the most proper way to implement in order to support just the system
 compilers and the desired gcc releases. Do I have to blacklist everything
 else?

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Ticket URL: <https://trac.macports.org/ticket/49010#comment:2>
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