[MacPorts] #56551: broken ports due to cxx_stdlib mismatch

[MacPorts]

#56551: broken ports due to cxx_stdlib mismatch
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  Reporter:  EJFielding                            |      Owner:  (none)
      Type:  defect                                |     Status:  new
  Priority:  Normal                                |  Milestone:
 Component:  ports                                 |    Version:  2.5.0
Resolution:                                        |   Keywords:
      Port:  TeXShop4 py27-scipy hdf5 SuiteSparse  |
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Comment (by jmroot):

 OK, so hdf5 at least still needs to be fixed. With those variants it's
 building with mpicxx-openmpi-gcc7. The mpi portgroup is probably where
 configure.cxx_stdlib needs to be set appropriately.

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Ticket URL: <https://trac.macports.org/ticket/56551#comment:18>
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