[MacPorts] #51874: commoncpp2 @1.8.1: error: friend declaration specifying a default argument must be a definition (was: commoncpp2 build fails)

[MacPorts]

#51874: commoncpp2 @1.8.1: error: friend declaration specifying a default argument
must be a definition
-------------------------+--------------------------------
  Reporter:  w3sz73@…    |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.4
Resolution:              |   Keywords:
      Port:  commoncpp2  |
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Comment (by ryandesign@…):

 Confirmed, I see the same problem. It looks like 1.8.1 was the last
 version of commoncpp2 and they have now integrated its functionality into
 ucommon. We should add a port for ucommon. However, the developers say on
 their web site they still intend to support and fix bugs in commoncpp2 so
 you should report the problem to its developers by writing to this mailing
 list:

 https://lists.gnu.org/mailman/listinfo/bug-commoncpp

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Ticket URL: <https://trac.macports.org/ticket/51874#comment:1>
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