[MacPorts] #57143: $port $version [$variants]: Unable to determine location of a macOS SDK

[MacPorts]

#57143: $port $version [$variants]: Unable to determine location of a macOS SDK
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  Reporter:  ivanatina  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  1.7.0
Resolution:             |   Keywords:
      Port:             |
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Comment (by tgyurci):

 The default value for `configure.sdkroot` is set with
 `portconfigure::configure_get_sdkroot` which is called at configuring any
 port, if I'm right, but at my case the failing port is sqlite3.  This
 procedure fails, if there is no `MacOSX${macosx_version}.sdk`.   This is
 the case after upgrading to Xcode 10.0 on macOS 10.13.

 This may be related to #56619

 P.S.: I am not the original reporter of this issue.

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Ticket URL: <https://trac.macports.org/ticket/57143#comment:6>
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