[MacPorts] #59195: nettle @3.5.1: Build failure on PowerPC due to calling in clang-8.0 as compiler.

[MacPorts]

#59195: nettle @3.5.1: Build failure on PowerPC due to calling in clang-8.0 as
compiler.
---------------------------+---------------------
  Reporter:  SerpentChris  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.6.1
Resolution:                |   Keywords:  powerpc
      Port:  nettle        |
---------------------------+---------------------

Comment (by jmroot):

 I think something like the attached is a decent approach until base is
 changed.

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Ticket URL: <https://trac.macports.org/ticket/59195#comment:11>
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