[MacPorts] #49074: qt5-mac @5.4.2: error: declaration of anonymous struct must be a definition

[MacPorts]

#49074: qt5-mac @5.4.2: error: declaration of anonymous struct must be a definition
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  Reporter:  fpvvd1@…  |      Owner:  mcalhoun@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.4
Resolution:            |   Keywords:  elcapitan
      Port:  qt5-mac   |
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Comment (by framic5@…):

 After making some progress with manual changes for the first libraries, I
 found a general solution. The problem can be tracked down to hard-coded
 relations in the chromium part of qtwebengine. On the project page one can
 find a solution:
 https://codereview.qt-project.org/#/c/127759/

 Until this change is included in a newer version of Qt5, a patch to
 chromium can be used. If no dylib variant is found in the sysroot path,
 the library tbd version is used. This allowed a successful build of
 qt5-mac for me.

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Ticket URL: <https://trac.macports.org/ticket/49074#comment:27>
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