[MacPorts] #60976: R @4.0.2 fails to configure with Xcode 12, missing includes in bzip2 test program

[MacPorts]

#60976: R @4.0.2 fails to configure with Xcode 12, missing includes in bzip2 test
program
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  Reporter:  raramayo  |      Owner:  i0ntempest
      Type:  defect    |     Status:  closed
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:  fixed     |   Keywords:
      Port:  R         |
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Comment (by jmroot):

 Implicit declaration warnings still need to be fixed; they will become an
 error again in the not-too-distant future.

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Ticket URL: <https://trac.macports.org/ticket/60976#comment:10>
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