[MacPorts] #64561: xxdiff isn't using the right compiler

[MacPorts]

#64561: xxdiff isn't using the right compiler
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  Reporter:  ryandesign  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:
      Port:  xxdiff      |
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Comment (by barracuda156):

 Replying to [ticket:64561 ryandesign]:
 > Yet:
 > {{{
 > gnumake: /opt/local/bin/clang++-mp-9.0: No such file or directory
 > }}}

 Any idea why this may happen? I get these errors with R packahes here:
 https://github.com/macports/macports-
 ports/pull/16916#issuecomment-1345639054

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Ticket URL: <https://trac.macports.org/ticket/64561#comment:1>
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