[MacPorts] #62626: R @4.0.5 compile failure due to implicit declarations

[MacPorts]

#62626: R @4.0.5 compile failure due to implicit declarations
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  Reporter:  adfernandes  |      Owner:  kjellpk
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.6.4
Resolution:               |   Keywords:  bigsur catalina
      Port:  R            |
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Comment (by i0ntempest):

 Well implicit function declaration strikes again. \\
 \\
 Possible workarounds: blacklist Xcode clang, or use openmp variant (which
 will blacklist Xcode clang).

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Ticket URL: <https://trac.macports.org/ticket/62626#comment:5>
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