[MacPorts] #62074: graphviz @2.40.1_3+pangocairo+x11: error: no member named 'copy_n' in namespace 'std::__1' (was: graphviz @2.40.1_3+pangocairo+x11.darwin_20.x86_64)

[MacPorts]

#62074: graphviz @2.40.1_3+pangocairo+x11: error: no member named 'copy_n' in
namespace 'std::__1'
-----------------------+------------------------
  Reporter:  jboydon   |      Owner:  ryandesign
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur
      Port:  graphviz  |
-----------------------+------------------------

Comment (by ryandesign):

 Please `sudo port clean graphviz` and then try again, and if it fails
 again, attach the full main.log, compressed if it is large. (The log you
 attached does not show us what happened during the configure phase and I
 am hoping that that output will help us understand why your build is using
 MacPorts clang 11 when it seems like it should be using Xcode clang.)

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Ticket URL: <https://trac.macports.org/ticket/62074#comment:3>
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