[MacPorts] #64660: inkscape: build failure due to "no template named 'optional' in namespace 'std'"

[MacPorts]

#64660: inkscape: build failure due to "no template named 'optional' in namespace
'std'"
-------------------------------+----------------------
  Reporter:  dyne2meter        |      Owner:  mascguy
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.7.1
Resolution:                    |   Keywords:
      Port:  inkscape poppler  |
-------------------------------+----------------------
Changes (by jmroot):

 * cc: dbevans (added)
 * port:  inkscape => inkscape poppler


Comment:

 Replying to [comment:2 reneeotten]:
 > not sure, but isn't `std:optional` only valid in C++17; if so it's
 probably not using a new enough compiler on these old(er) systems.
 That's right. Looks like poppler is now requiring its dependents to build
 as C++17. That's a bit of extra pain here because inkscape seems to be
 explicitly adding `-std=c++11`.

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Ticket URL: <https://trac.macports.org/ticket/64660#comment:6>
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