[MacPorts] #65408: Error: z3 @4.8.17: +polly requires macports-clang-12 or later (incompatible compiler selected)

[MacPorts]

#65408: Error: z3 @4.8.17: +polly requires macports-clang-12 or later (incompatible
compiler selected)
-------------------------+-----------------------
  Reporter:  cave-canem  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.2
Resolution:              |   Keywords:  Mavericks
      Port:  z3          |
-------------------------+-----------------------

Comment (by jmroot):

 {{{
 :debug:configure Preferred compilers: macports-clang macports-gcc clang
 }}}
 You appear to have overridden `default_compilers`. I suspect it will work
 if you don't do that.

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Ticket URL: <https://trac.macports.org/ticket/65408#comment:1>
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