[MacPorts] #67486: bc: link fails for 10.6: duplicate symbol _edit in bc.o and main.o

[MacPorts]

#67486: bc: link fails for 10.6: duplicate symbol _edit in bc.o and main.o
----------------------+-------------------------
  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  closed
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:  fixed    |   Keywords:  snowleopard
      Port:  bc       |
----------------------+-------------------------

Comment (by jmroot):

 The `edit` variable is defined (not declared) in `global.h`, so every file
 that includes it will have its own definition. The definition should
 probably be moved to `global.c` and extern declarations put in `global.h`.

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Ticket URL: <https://trac.macports.org/ticket/67486#comment:4>
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