[MacPorts] #64276: macports will not build ports with Xcode 13.2.1

[MacPorts]

#64276: macports will not build ports with Xcode 13.2.1
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 Reporter:  AgilentGCMS  |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.7.1
 Keywords:               |       Port:
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 I recently updated my mac to Big Sur, and Xcode to 13.2.1. I cleaned out
 my old port tree and started to build the necessary ports from scratch.
 Unfortunately, I've failed to build even a single port successfully (yes,
 I have installed the SDK, it's 12.1). Finally, "port diagnose" told me:

 Error: currently installed version of Xcode, 13.2.1, is not supported by
 MacPorts.  For your currently installed system, only the following
 versions of Xcode are supported:  13.1 13.0 12.5.1 12.5 12.4 12.3 12.2

 I've never before faced the problem of my Xcode or SDK being too new. Is
 there a way to build ports with Xcode 13.2.1, or must I downgrade Xcode?

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Ticket URL: <https://trac.macports.org/ticket/64276>
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