[MacPorts] #69729: python313-devel @3.13.0a6 Builds OK, but destroot fails with 'missing file' on macOS < 10.12

[MacPorts]

#69729: python313-devel  @3.13.0a6 Builds OK, but destroot fails with 'missing
file' on macOS < 10.12
------------------------------+----------------------
  Reporter:  snowflake        |      Owner:  jmroot
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.9.99
Resolution:                   |   Keywords:
      Port:  python313-devel  |
------------------------------+----------------------

Comment (by snowflake):

 On my git checkout with tag v3.13.0a6 and system clang I get:

 configure:6890: checking for the platform triplet based on compiler
 characteristics
 configure:6895: result: darwin
 configure:6903: checking for multiarch
 configure:6926: result: darwin

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Ticket URL: <https://trac.macports.org/ticket/69729#comment:7>
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