[MacPorts] #27379: lua @5.1.4 does not obey build_arch

[MacPorts]

#27379: lua @5.1.4 does not obey build_arch
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 Reporter:  corwin.amber@…          |       Owner:  pmq@…           
     Type:  defect                  |      Status:  new             
 Priority:  Normal                  |   Milestone:                  
Component:  ports                   |     Version:  1.9.2           
 Keywords:                          |        Port:  lua             
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Comment(by corwin.amber@…):

 Sorry about that. My build_arch is not set in macports.conf, which
 according to the documentation in there is set to x86_64 by default if
 you're running on a 64-bit CPU and your OS supports it; which seems to be
 the case for every single port I compiled save this one. I only added the
 line {{{universal_archs x86_64 i386}}} to explain why it does work with
 {{{+universal}}}.

 Actually now I notice that the comment above {{{build_archs}}} is rather
 ambiguous in the sense that it's not clear if the OS being referred to is
 the user's own or the one set in {{{macosx_deployment_target}}}.

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Ticket URL: <https://trac.macports.org/ticket/27379#comment:2>
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