[MacPorts] #69812: cmake-bootstrap @3.9.6 does not compile under rosetta2

[MacPorts]

#69812: cmake-bootstrap @3.9.6 does not compile under rosetta2
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  Reporter:  lukaso           |      Owner:  (none)
      Type:  defect           |     Status:  new
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:
Resolution:                   |   Keywords:
      Port:  cmake-bootstrap  |
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Comment (by lukaso):

 > If you mean comping for one macOS version on another macOS version, or
 for one macOS architecture from another macOS architecture, then yes, with
 the caveat that it is not well tested and there are therefore frequent
 problems.

 How is this done? I might as well try it.

 > The simplest way to do so would be to perform the builds on a machine
 that runs macOS 10.13.

 I've tried to find ways of doing this. But it's not OK for our builds to
 be on a machine under my desk. How does Macports do this? I suppose, if I
 had a VM that was properly hosted, I could support even older MacOS
 versions.

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Ticket URL: <https://trac.macports.org/ticket/69812#comment:8>
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