[MacPorts] #20029: chicken: update to version 4.2.0

[MacPorts]

#20029: chicken: update to version 4.2.0
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 Reporter:  lkraider+ports@…          |       Owner:  arto.bendiken@…        
     Type:  update                    |      Status:  new                    
 Priority:  Normal                    |   Milestone:                         
Component:  ports                     |     Version:                         
 Keywords:                            |        Port:  chicken                
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Comment(by jann@…):

 You forgot, that the first intel iMacs can run OS 10.6 but don't have
 64bit processors. Therefore you should use this construct:

 {{{
 if {${build_arch} == "x86_64"} {
 # Do something
 }
 }}}

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Ticket URL: <http://trac.macports.org/ticket/20029#comment:12>
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