[MacPorts] #14573: update the Portfile for vips

[MacPorts]

#14573: update the Portfile for vips
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 Reporter:  jcupitt at gmail.com  |       Owner:  macports-tickets at lists.macosforge.org
     Type:  enhancement        |      Status:  new                                  
 Priority:  Normal             |   Milestone:  Port Updates                         
Component:  ports              |     Version:  1.6.0                                
 Keywords:                     |  
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 vips has just released a major new version, 7.14.0, here's an updated
 portfile

 I'm a portfile newbie, I hope I have it right. It seems to work for me,
 anyway.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14573>
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