[MacPorts] #71164: mpdecimal @4.0.0_1: Build failure on legacy OS X due to undefined symbols

[MacPorts]

#71164: mpdecimal @4.0.0_1: Build failure on legacy OS X due to undefined symbols
------------------------+-------------------------
  Reporter:  0xbf00     |      Owner:  Schamschula
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.2
Resolution:             |   Keywords:  leopard
      Port:  mpdecimal  |
------------------------+-------------------------

Comment (by kencu):

 possibly happening because {{{-stdlib=macports-libstdc++}}} is not making
 it onto to the link line, despite being in the CXXFLAGS.

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Ticket URL: <https://trac.macports.org/ticket/71164#comment:3>
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