[MacPorts] #54928: webkit2-gtk build failing under High Sierra

[MacPorts]

#54928: webkit2-gtk build failing under High Sierra
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 Reporter:  pmetzger  |      Owner:
     Type:  defect    |     Status:  new
 Priority:  High      |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  webkit2-gtk
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 My build is dying with:

 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.14.2/Source/ThirdParty/ANGLE/src/com/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.14.2/Source/ThirdParty/ANGLE/src/common/mathutil.h:562:20:
 error: delegating constructors are permitted only in C++11
     IndexRange() : IndexRange(0, 0, 0) {}
                    ^~~~~~~~~~
 11 warnings and 1 error generated.

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Ticket URL: <https://trac.macports.org/ticket/54928>
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