[MacPorts] #56172: LyX @2.3.0_0: fatal error: 'QPdfWriter' file not found

[MacPorts]

#56172: LyX @2.3.0_0: fatal error: 'QPdfWriter' file not found
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  Reporter:  iqgrande  |      Owner:  kurthindenburg
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.2
Resolution:            |   Keywords:
      Port:  LyX       |
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Comment (by kencu):

 qt4 has no file called `QPdfWriter` -- that's a qt5 only header.

 I'm not sure why this header is getting pulled into the qt4 build now,
 when it never was before.

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Ticket URL: <https://trac.macports.org/ticket/56172#comment:7>
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