[MacPorts] #63533: materialx: Some dependencies fail to install on some builders

[MacPorts]

#63533: materialx: Some dependencies fail to install on some builders
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  Reporter:  jasonliu--               |      Owner:  admin@…
      Type:  defect                   |     Status:  new
  Priority:  Normal                   |  Milestone:
 Component:  buildbot/mpbb            |    Version:  2.7.1
Resolution:                           |   Keywords:
      Port:  materialx doxygen cmake  |
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Changes (by jasonliu--):

 * Attachment "install-dependencies-build160287-10.9_x86_64-builder" added.

 Attaching full log, just in case it disappears from the builder

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Ticket URL: <https://trac.macports.org/ticket/63533>
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