[MacPorts] #13693: Fix compilation of gnustep-base

[MacPorts]

#13693: Fix compilation of gnustep-base
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 Reporter:  fedor at qwest.net  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  enhancement      |      Status:  new                                  
 Priority:  Normal           |   Milestone:  Port Enhancements                    
Component:  ports            |     Version:  1.5.2                                
 Keywords:                   |  
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 ffcall does not work on MacOS X since 10.4, and so gnustep-base should not
 depend on it. This patch updates the configuration so that libffi is now
 the default and ffcall is a variant. libffi should be preferred on any
 platform that it has been ported to.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/13693>
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