[MacPorts] #61258: atlas-3.10.2: error: "Failed to build atlas: command execution failed"

[MacPorts]

#61258: atlas-3.10.2: error: "Failed to build atlas: command execution failed"
-------------------------------+-------------------------------------
  Reporter:  gsarrouh          |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.6.3
Resolution:                    |   Keywords:  atlas, source extractor
      Port:  source-extractor  |
-------------------------------+-------------------------------------

Comment (by chrstphrchvz):

 The issue is that implicit function declarations used to be considered
 warnings, but are now considered errors with Xcode 12. The canned response
 is to downgrade to Xcode 11.x to avoid the errors until MacPorts addresses
 them.

 Existing upstream ticket regarding these implicit function declarations
 (no feedback yet from developer): https://sourceforge.net/p/math-atlas
 /support-requests/1082/

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Ticket URL: <https://trac.macports.org/ticket/61258#comment:1>
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