[MacPorts] #59217: boost, graphite2, possibly other ports use macports-libstdc++ instead of libc++

[MacPorts]

#59217: boost, graphite2, possibly other ports use macports-libstdc++ instead of
libc++
-------------------------------+-------------------------------------------
  Reporter:  ryandesign        |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.6.1
Resolution:                    |   Keywords:  snowleopard lion mountainlion
      Port:  boost, graphite2  |
-------------------------------+-------------------------------------------

Comment (by jmroot):

 Overriding cxx_stdlib is a perfectly valid thing to do in some cases and
 rebuilding ports that still do it won't change anything. Just removing the
 10.6-10.8 archives for all ports that use the cxx11 portgroup and haven't
 been updated since the changeover should be fine.

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Ticket URL: <https://trac.macports.org/ticket/59217#comment:3>
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