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

[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    |
-------------------------+----------------------
Changes (by reneeotten):

 * status:  new => assigned
 * owner:  (none) => mascguy
 * port:   => inkscape


Comment:

 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.

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Ticket URL: <https://trac.macports.org/ticket/64660#comment:2>
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