[MacPorts] #61849: gobject-introspection: Configure failure on Big Sur 11.1 and Xcode 12.3

[MacPorts]

#61849: gobject-introspection: Configure failure on Big Sur 11.1 and Xcode 12.3
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  Reporter:  mf2k                   |      Owner:  dbevans
      Type:  defect                 |     Status:  assigned
  Priority:  Normal                 |  Milestone:
 Component:  ports                  |    Version:
Resolution:                         |   Keywords:
      Port:  gobject-introspection  |
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Comment (by mf2k):

 I can confirm that changing the SDK to 11.1 in base allows this to build
 now.

 {{{
 $ port -v installed gobject-introspection
 The following ports are currently installed:
   gobject-introspection @1.60.2_4 (active) platform='darwin 20'
 archs='x86_64' date='2020-12-18T09:47:46-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/61849#comment:11>
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