[MacPorts] #58754: xorg-libXau 1.0.9: fails to install during build with xcode 7 and 8 by Travis CI

[MacPorts]

#58754: xorg-libXau 1.0.9: fails to install during build with xcode 7 and 8 by
Travis CI
------------------------------+---------------------
  Reporter:  lhaeger          |      Owner:  admin@…
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  buildbot/mpbb    |    Version:  2.5.4
Resolution:                   |   Keywords:
      Port:  xca xorg-libXau  |
------------------------------+---------------------

Comment (by l2dy):

 That's a temporary network issue. I've restarted the build.

 {{{
 Installing dependency (75 of 91) 'qt5-qtbase' with variants '+openssl'
 (requesting '') ... [FAIL] (fetch)
 }}}

 Build failed on OS X 10.11 because qt5-qtbase requires macOS 10.12 or
 later.

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Ticket URL: <https://trac.macports.org/ticket/58754#comment:1>
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