[MacPorts] #20871: cmake universal build fails to find elf.h on 10.6

[MacPorts]

#20871: cmake universal build fails to find elf.h on 10.6
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 Reporter:  treaves@…                 |       Owner:  css@…           
     Type:  defect                    |      Status:  assigned        
 Priority:  Normal                    |   Milestone:                  
Component:  ports                     |     Version:  1.8.0           
 Keywords:                            |        Port:  cmake           
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Comment(by css@…):

 It looks like adding `universal_variant no` might be the easiest fix for
 now.

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Ticket URL: <http://trac.macports.org/ticket/20871#comment:10>
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