[MacPorts] #60978: qt5-qtwebengine @ 5.14.2_1 build fails with 'xpath_grammar.hh' file not found

[MacPorts]

#60978: qt5-qtwebengine @ 5.14.2_1 build fails with 'xpath_grammar.hh' file not
found
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  Reporter:  hapaguy          |      Owner:  MarcusCalhoun-Lopez
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.3
Resolution:                   |   Keywords:
      Port:  qt5-qtwebengine  |
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Comment (by Schamschula):

 This is an issue with bison 3.7. See: https://bugs.gentoo.org/734356

 There is a patch: https://734356.bugs.gentoo.org/attachment.cgi?id=652054

 which worked for me.

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Ticket URL: <https://trac.macports.org/ticket/60978#comment:3>
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