[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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Comment (by kencu):

 and doxygen is not building on 10.11, for some reason I haven't looked
 into:

 https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/151490/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/63533#comment:2>
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