[MacPorts] #60039: freecad @0.18.4_0+gcc9: configure failure, can't find boost

[MacPorts]

#60039: freecad @0.18.4_0+gcc9: configure failure, can't find boost
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  Reporter:  informatimago  |      Owner:  Schamschula
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.6.2
Resolution:                 |   Keywords:
      Port:  freecad        |
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Comment (by Schamschula):

 Both errors are related. Somehow {{{ofstream}}} can't be found on your
 system. I'm assuming you have the command line tools installed, but it
 seems that the required headers aren't being found - they should be there.

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Ticket URL: <https://trac.macports.org/ticket/60039#comment:7>
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