[MacPorts] #60399: R @3.6.3_1 fails building on 10.5.8

[MacPorts]

#60399: R @3.6.3_1 fails building on 10.5.8
-------------------------+---------------------
  Reporter:  udbraumann  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:  leopard
      Port:  R           |
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Comment (by kencu):

 FYI, long double constant folding is broken for powerpc with gcc.
 <https://gcc.gnu.org/bugzilla//show_bug.cgi?id=19779>, both 32 bit and
 64bit, for years now...never fixed, for whatever reason.

 So the fix indeed should be just to change that {{{_PPC64__}}} to
 something more general, like {{{__powerpc__}}}, as the debian report
 suggests.

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Ticket URL: <https://trac.macports.org/ticket/60399#comment:2>
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