[MacPorts] #55154: qt57-qtbase: error: use of class template 'optional' requires template arguments

[MacPorts]

#55154: qt57-qtbase: error: use of class template 'optional' requires template
arguments
---------------------------+---------------------------------
  Reporter:  SchmollTroll  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect        |     Status:  accepted
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.2
Resolution:                |   Keywords:  mountainlion
      Port:  qt5-qtbase    |
---------------------------+---------------------------------

Comment (by SchmollTroll):

 Many thanks for your modifications! Builds now without any errors.

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Ticket URL: <https://trac.macports.org/ticket/55154#comment:5>
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