[MacPorts] #62805: et @6.1.7: builds failing for all macOS releases earlier than 10.15

[MacPorts]

#62805: et @6.1.7: builds failing for all macOS releases earlier than 10.15
----------------------+----------------------
  Reporter:  mascguy  |      Owner:  l2dy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  et       |
----------------------+----------------------
Description changed by mascguy:

Old description:

> https://ports.macports.org/port/et/builds
>
> Failures are occurring on the buildbots, as well as locally.
>
> Error appears to be:
>
> {{{
> /opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_net_et/et/work/EternalTerminal-6.1.7/src/base/Headers.hpp:88:10:
> fatal error: 'experimental/filesystem' file not found
> #include <experimental/filesystem>
>          ^~~~~~~~~~~~~~~~~~~~~~~~~
> }}}

New description:

 https://ports.macports.org/port/et/builds

 Failures are occurring on the buildbots, as well as locally.

 Error appears to be:

 {{{
 .../work/EternalTerminal-6.1.7/src/base/Headers.hpp:88:10: fatal error:
 'experimental/filesystem' file not found
 #include <experimental/filesystem>
          ^~~~~~~~~~~~~~~~~~~~~~~~~
 }}}

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Ticket URL: <https://trac.macports.org/ticket/62805#comment:1>
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