[MacPorts] #21856: rb-cocoa build fails

[MacPorts]

#21856: rb-cocoa build fails
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  Reporter:  jwhowse4@…            |       Owner:  kimuraw@…           
      Type:  defect                |      Status:  closed              
  Priority:  Normal                |   Milestone:                      
 Component:  ports                 |     Version:  1.8.1               
Resolution:  fixed                 |    Keywords:                      
      Port:  rb-cocoa              |  
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Comment(by jmr@…):

 Setting build_arch to blank in macports.conf is user error. It is
 commented out by default, and therefore has a default value appropriate to
 the hardware and OS version.

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Ticket URL: <http://trac.macports.org/ticket/21856#comment:4>
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