[MacPorts] #37647: R-framework depends on llvm-gcc42 but requires gfortran

[MacPorts]

#37647: R-framework depends on llvm-gcc42 but requires gfortran
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  Reporter:  gnwiii@…     |      Owner:  kjell.konis@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.2
Resolution:               |   Keywords:
      Port:  R-framework  |
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Comment (by kjell.konis@…):

 Message to committer: I changed the default compiler to gcc45.  If gcc46
 or gcc47 would be more appropriate please feel free to change.

 The attached patch removes the llvm-gcc42 variant and make gcc45 the
 default.  This was on my list of changes for R 3.0.0 which is due in April
 but it looks like llvm-gcc42 is twisting my arm.  The patch also removes
 tcltk from the default dependencies to (kind of) address bug #37107 and
 properly sets OBJCXX in etc/Makeconf to address bug #35845.

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Ticket URL: <https://trac.macports.org/ticket/37647#comment:3>
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