[MacPorts] #60977: webkit-gtk3 @ 2.4.11_4+video build fails with 'CSSGrammar.hpp' file not found

[MacPorts]

#60977: webkit-gtk3 @ 2.4.11_4+video build fails with 'CSSGrammar.hpp' file not
found
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  Reporter:  hapaguy      |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  webkit-gtk3  |
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Comment (by hapaguy):

 I suspect that this issue is related to a similar issue with
 qt5-qtwebengine (https://trac.macports.org/ticket/60978), which is caused
 by a bison 3.7 bug (https://trac.macports.org/ticket/60978#comment:3).

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Ticket URL: <https://trac.macports.org/ticket/60977#comment:5>
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