[MacPorts] #60039: freecad-0.18.4_0+gcc9.darwin_19.x86_64 can't find boost

[MacPorts]

#60039: freecad-0.18.4_0+gcc9.darwin_19.x86_64 can't find boost
---------------------------+---------------------
 Reporter:  informatimago  |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.6.2
 Keywords:                 |       Port:  freecad
---------------------------+---------------------
 ```
 --->  Configuring freecad
 Error: Failed to configure freecad: configure failure: command execution
 failed

 ```
 see main.log

-- 
Ticket URL: <https://trac.macports.org/ticket/60039>
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