[MacPorts] #16331: ruby-1.8.7-p72 Configure error - build failure for x86_64 [universal or single arch]

[MacPorts]

#16331: ruby-1.8.7-p72 Configure error - build failure for x86_64 [universal or
single arch]
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  Reporter:  m at miguelgodinho.com  |       Owner:  kimuraw at macports.org             
      Type:  defect               |      Status:  assigned                         
  Priority:  Normal               |   Milestone:  Port Bugs                        
 Component:  ports                |     Version:  1.6.0                            
Resolution:                       |    Keywords:  x86-64, universal, ruby, pthreads
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Comment (by jmr at macports.org):

 Apple's gcc builds for i386 by default when running on x86_64, so that's
 the arch that ends up in tcl_platform(machine), which is where we get the
 os.arch value.

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Ticket URL: <http://trac.macports.org/ticket/16331#comment:5>
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