[MacPorts] #66549: qt511-qtimageformats @5.11.3_2: Could not resolve SDK Path for 'macosx10.11' using --show-sdk-path

[MacPorts]

#66549: qt511-qtimageformats @5.11.3_2: Could not resolve SDK Path for
'macosx10.11' using --show-sdk-path
-----------------------------------+---------------------------------
  Reporter:  thetrial              |      Owner:  MarcusCalhoun-Lopez
      Type:  defect                |     Status:  assigned
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.8.0
Resolution:                        |   Keywords:  elcapitan legacy-os
      Port:  qt511-qtimageformats  |
-----------------------------------+---------------------------------

Comment (by thetrial):

 So shall I wait and not delete Xcode 8.2? That would be the best solution
 indeed, as 8.2 is the typically given last Xcode under 10.11 (I guess).

 But, what for are the MacPorts’ given SDKs then? I guess I can remove that
 afterwards, can I? It does not aid in problematic situations like this.

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Ticket URL: <https://trac.macports.org/ticket/66549#comment:22>
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