[MacPorts] #73923: tcl9 fails to build on Leopard

[MacPorts]

#73923: tcl9 fails to build on Leopard
---------------------------+---------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.12.5
Resolution:                |   Keywords:  leopard
      Port:  tcl9          |
---------------------------+---------------------

Comment (by Dave-Allured):

 Lines 1627-1710:
 {{{
 Undefined symbols:
 :info:build   "___builtin_unreachable", referenced from:
 :info:build       _BinaryDecode64 in tclBinary.o
 :info:build       _BinaryDecodeUu in tclBinary.o
 :info:build       _BinaryEncode64 in tclBinary.o
 <snip>
 :info:build       _TclOODefinePropertyCmd in tclOOProp.o
 :info:build       _TclOOInfoObjectPropCmd in tclOOProp.o
 :info:build       _TclOOInfoClassPropCmd in tclOOProp.o
 :info:build ld: symbol(s) not found
 :info:build collect2: ld returned 1 exit status
 :info:build make: *** [libtcl9.0.dylib] Error 1
 }}}
 The log file is badly scrambled because of parallel compiles.  Can you
 retry with serial build only?

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Ticket URL: <https://trac.macports.org/ticket/73923#comment:4>
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