[MacPorts] #41998: yaml-cpp @0.5.1 version update

[MacPorts]

#41998: yaml-cpp @0.5.1 version update
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  Reporter:  patrick@…  |      Owner:  macports-tickets@…
      Type:  update     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.2.1
Resolution:             |   Keywords:
      Port:  yaml-cpp   |
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Comment (by sean@…):

 Also, note that that the port is missing Boost as a dependency.

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Ticket URL: <https://trac.macports.org/ticket/41998#comment:4>
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