[MacPorts] #70087: plplot fails to build: cc1: error: argument to '-O' should be a non-negative integer, 'g', 's', 'z' or 'fast'

[MacPorts]

#70087: plplot fails to build: cc1: error: argument to '-O' should be a non-
negative integer, 'g', 's', 'z' or 'fast'
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:
      Port:  plplot        |
---------------------------+--------------------

Comment (by ryandesign):

 Replying to [comment:6 barracuda156]:
 > This should be conditional on Clang used, and likely the port is fixed.

 What makes you think this flag is specific to clang? The flag was added to
 plplot in 2006 before clang existed.

 https://sourceforge.net/p/plplot/plplot/ci/0db87c2b7f495f16e24c0bc4dd38a51c15c71bdc/

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Ticket URL: <https://trac.macports.org/ticket/70087#comment:8>
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