[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 kencu):

 the real issue is the current portgile testing shows he has the 10.11 sdk
 when he doesn’t have it:
 {{{
 105     :debug:configure qt5 Portfile: the initial SDK value is:
 macosx10.11
 106     :debug:configure qt5 Portfile: testing for system-specific SDK:
 107     :debug:configure qt5 Portfile: system-specific SDK was found.
 108     :debug:configure qt5 Portfile: the final SDK value is: macosx10.11
 }}}

 so he doesn’t properly fall back.

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Ticket URL: <https://trac.macports.org/ticket/66549#comment:19>
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