[MacPorts] #49449: pymol: error: no type named 'shared_ptr' in namespace 'std'

[MacPorts]

#49449: pymol: error: no type named 'shared_ptr' in namespace 'std'
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  Reporter:  kathryn.cole@…  |      Owner:  howarth.at.macports@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.3.4
Resolution:                  |   Keywords:
      Port:  pymol           |
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Comment (by howarth.at.macports@…):

 The attached Portfile.diff adds -stdlib=libc++ when the clang compilers
 are in use. It also drops support for FSF gcc variants prior to gcc 4.7 to
 insure that those variants have c++-11 support going forward.

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Ticket URL: <https://trac.macports.org/ticket/49449#comment:9>
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