[MacPorts] #56724: webkit2-gtk @2.20.3+quartz fails to build on OS X 10.11

[MacPorts]

#56724: webkit2-gtk @2.20.3+quartz fails to build on OS X 10.11
--------------------------+-----------------------
  Reporter:  EdHarry      |      Owner:  jeremyhu
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.5.2
Resolution:               |   Keywords:  elcapitan
      Port:  webkit2-gtk  |
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Comment (by kencu):

 So the trick with `webkit2-gtk` is that it is very actively developed, and
 tends to use the latest features on macOS.

 There are, thankfully, lots of toggle switches to turn things off, at
 least for a while. Over time these toggle switches tend to be deleted as
 features are more-or-less defaulted as the floor.

 It would be most effective to start with `webkit2-gtk +quartz` on `10.13`,
 see if that builds, and then work backwards.

 It is highly likely that the `+quartz` variant won't build back as far as
 the `+x11` variant, however, due to newer macOS SDK requirements.

-- 
Ticket URL: <https://trac.macports.org/ticket/56724#comment:3>
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