[MacPorts] #67777: PDAL: possible to switch to using our Eigen3?

[MacPorts]

#67777: PDAL: possible to switch to using our Eigen3?
---------------------------+----------------------
  Reporter:  barracuda156  |      Owner:  Veence
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  powerpc
      Port:  PDAL          |
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Comment (by barracuda156):

 Looks like it does not have such an option. I will fix PPC build another
 way.

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Ticket URL: <https://trac.macports.org/ticket/67777#comment:2>
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