[MacPorts] #55857: boost @1.66.0_0 +universal has no i386 symbols

[MacPorts]

#55857: boost @1.66.0_0 +universal has no i386 symbols
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  Reporter:  devernay  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  i386
      Port:  boost     |
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Comment (by devernay):

 As mentionned above, a dirty hack to build universal is to add ourselves
 the arch flags to the cxxflags in the right write_jam line in the
 Portfile.

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Ticket URL: <https://trac.macports.org/ticket/55857#comment:7>
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