[MacPorts] #63558: qscintilla-qt5 @ 2.13.0_0: Could not resolve SDK Path for 'macosx10.11'

[MacPorts]

#63558: qscintilla-qt5 @ 2.13.0_0: Could not resolve SDK Path for 'macosx10.11'
-----------------------------+---------------------------------
  Reporter:  thetrial        |      Owner:  michaelld
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.7.1
Resolution:                  |   Keywords:  elcapitan legacy-os
      Port:  qscintilla-qt5  |
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Comment (by michaelld):

 @thetrail: Unless you've messed with the SDKs, adding in some extras
 and/or some links back and forth between the various installs, then adding
 in `use_xcode yes` should do the trick. The log shows the error associated
 with not using `use_xcode yes`, in my experience.

 Related: it looks like your host OS is MacOSX 10.11.6. Someone correct me
 if I'm wrong, but I don't think it's wise to build for a future MacOSX
 (10.12) within an older MacOSX (10.11). Why do you have OSX 10.12 SDK
 installed? Strongly recommend you remove it & get the Xcode and CLT back
 to defaults.

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Ticket URL: <https://trac.macports.org/ticket/63558#comment:11>
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