[MacPorts] #31734: VirtualBox 4.1.6 doesn't work with Lion and Xcode 4.2

[MacPorts]

#31734: VirtualBox 4.1.6 doesn't work with Lion and Xcode 4.2
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  Reporter:  jk@…          |       Owner:  royliu@…           
      Type:  defect        |      Status:  reopened           
  Priority:  Normal        |   Milestone:                     
 Component:  ports         |     Version:  2.0.3              
Resolution:                |    Keywords:                     
      Port:  virtualbox    |  
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Comment(by royliu@…):

 This may be a problem with your build procedure.  The `configure` scripts
 `check_avail` function is failing on an empty `CXX` variable, and I don't
 see how that's possible, since we set it.

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Ticket URL: <https://trac.macports.org/ticket/31734#comment:42>
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