[MacPorts] #27641: boost uses icu even without the +icu variant

[MacPorts]

#27641: boost uses icu even without the +icu variant
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 Reporter:  ryandesign@…             |       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@…):

 Replying to [comment:2 ryandesign@…]:
 > I've just rebuilt boost with the +icu variant on my boxes. Is it perhaps
 a solution to delete the icu variant and just make the icu port a
 permanent dependency of boost?

 Yes; I've just spent a '''long''' time winding my way through the boost
 configuration and build system, and it seems that boost doesn't actually
 configure itself to use or not-use `icu`. Instead, it just adds `icu` to
 the search path. Since `bzip2`, `expat`, and `zlib` are all taken from
 MacPorts, it automagically finds `icu` as well. There's no way to stop it.

 I'm re-building boost now to do this and will commit when tested.

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Ticket URL: <https://trac.macports.org/ticket/27641#comment:3>
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