[MacPorts] #28752: libvpx fails to build if dev tools are installed outside /Developer

[MacPorts]

#28752: libvpx fails to build if dev tools are installed outside /Developer
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  Reporter:  intrprog-sacrificial1@…       |       Owner:  ryandesign@…           
      Type:  defect                        |      Status:  closed                 
  Priority:  Normal                        |   Milestone:                         
 Component:  ports                         |     Version:  1.9.2                  
Resolution:  fixed                         |    Keywords:  developer_dir          
      Port:  libvpx                        |  
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Comment(by ryandesign@…):

 Similar problems might absolutely exist in other ports. If you find them,
 please file individual tickets about them so we can fix them.

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Ticket URL: <https://trac.macports.org/ticket/28752#comment:5>
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