[MacPorts] #43531: yaml-cpp @0.5.1 fails to compile

[MacPorts]

#43531: yaml-cpp @0.5.1 fails to compile
------------------------+-----------------------
  Reporter:  wichert@…  |      Owner:  patrick@…
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.2.1
Resolution:             |   Keywords:
      Port:  yaml-cpp   |
------------------------+-----------------------

Comment (by wichert@…):

 This appears to be something specific to the cmake portgroup. If I try to
 compile yaml-cpp by hand by just doing this:

 {{{
 mkdir build
 cd build
 cmake ..
 make
 }}}

 It compiles succesfully.

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Ticket URL: <https://trac.macports.org/ticket/43531#comment:2>
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