[MacPorts] #66871: Installation on Leopard broken? Error: The installed version of Xcode (3.1.4) is too old to use on the installed OS version. Version 14.2 or late is recommended

[MacPorts]

#66871: Installation on Leopard broken? Error: The installed version of Xcode
(3.1.4) is too old to use on the installed OS version. Version 14.2 or late
is recommended
---------------------------+------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  base          |    Version:  2.8.1
Resolution:                |   Keywords:  leopard, powerpc
      Port:                |
---------------------------+------------------------------

Comment (by barracuda156):

 Replying to [comment:2 jmroot]:
 > There's a version number printed at the end of that message. `Version
 $rec or later is recommended on macOS ${macos_version_major}.` If
 `$macos_version_major` is empty on your system for some reason, that will
 cause all kinds of problems.
 >
 > No problems building things on Leopard in an x86 VM here BTW.

 Where does `macos_version_major` get pulled from?

-- 
Ticket URL: <https://trac.macports.org/ticket/66871#comment:3>
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