[MacPorts] #28327: boost does not follow build_arch

[MacPorts]

#28327: boost does not follow build_arch
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 Reporter:  andrebragareis@…          |       Owner:  adfernandes@…           
     Type:  defect                    |      Status:  new                     
 Priority:  Normal                    |   Milestone:                          
Component:  ports                     |     Version:  1.9.2                   
 Keywords:                            |        Port:  boost                   
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Comment(by adfernandes@…):

 I think I say the same thing every time I need to build boost... I
 '''hate''' boost's bjam build system... :-)

 Please try the attached patch and let me know if the build_arch is being
 correctly honoured.

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Ticket URL: <https://trac.macports.org/ticket/28327#comment:2>
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