[MacPorts] #64771: libvirt @8.1.0: error: unknown type name 'hyper' (was: libvirt: 8.1.0 fails to build on 10.13 and earlier; XCode Clang v10.0 or later required)

[MacPorts]

#64771: libvirt @8.1.0: error: unknown type name 'hyper'
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  Reporter:  mascguy  |      Owner:  ryandesign
      Type:  defect   |     Status:  reopened
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.7.1
Resolution:           |   Keywords:
      Port:  libvirt  |
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Comment (by ryandesign):

 I am unfamiliar with `type name 'hyper'`. Upstream has previously been
 unwilling to invest any effort in support for older systems, though they
 will accept uncomplicated fixes for such issues; if you can devise one,
 please do.

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Ticket URL: <https://trac.macports.org/ticket/64771#comment:4>
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