[MacPorts] #52090: tk @8.6.6_0 fails building on 10.6.8

[MacPorts]

#52090: tk @8.6.6_0 fails building on 10.6.8
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  Reporter:  braumann@…  |      Owner:  mww@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:  snowleopard
      Port:  tk          |
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Comment (by Peter_Dyballa@…):

 The C code that leads to the failure has to do with Retina displays. They
 seem to have -backingScaleFactor times the resolution of X11 horizontally
 and vertically.

 The lines 893–904, 933+934, 971–973 seem to be obsolete for non-Retina
 displays, 935, 946, 956, 969 need a change for them.

 What is an appropriate guard for a `#ifdef`?

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Ticket URL: <https://trac.macports.org/ticket/52090#comment:7>
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