[MacPorts] #69455: poppler @24.03.0: build failure on macOS 10.14 and earlier due to use of std::filesystem

[MacPorts]

#69455: poppler @24.03.0: build failure on macOS 10.14 and earlier due to use of
std::filesystem
-------------------------+-------------------------------------------------
  Reporter:  lukaso      |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.8.1
Resolution:              |   Keywords:  tiger leopard snowleopard lion
                         |  mountainlion mavericks yosemite elcapitan
      Port:  poppler     |  sierra highsierra mojave
-------------------------+-------------------------------------------------

Comment (by kencu):

 using gcc to build against libc++ is highly experimental.

 Iain has reported the libc++ headers do not work correctly at present for
 this purpose, and a set of modified libc++ headers will be needed. These
 don’t currently exist.

 not to mention that the system libc++ won’t have filesystem support in it
 anyway, so you’re no further ahead.

 building against macports-libcxx, if it works properly, is likely the only
 hope for libc++ systems.

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Ticket URL: <https://trac.macports.org/ticket/69455#comment:7>
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