[MacPorts] #70235: opencascade: wrong handling of symbols on older macOS

[MacPorts]

#70235: opencascade: wrong handling of symbols on older macOS
---------------------------+----------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.9.3
Resolution:                |   Keywords:  snowleopard, powerpc
      Port:  opencascade   |
---------------------------+----------------------------------

Comment (by barracuda156):

 It is a mess starting from configure:
 {{{
 -- Info: TKIVtk and TKIVtkDraw toolkits excluded due to VTK usage is
 disabled
 -- Info: The directories of 3rdparty headers:
         /System/Library/Frameworks/Tcl.framework/Headers
         /System/Library/Frameworks/Tk.framework/Headers
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70235#comment:3>
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