[MacPorts] #15333: libpixman: Disable GTK support

[MacPorts]

#15333: libpixman: Disable GTK support
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  Reporter:  nox at macports.org  |       Owner:  ryandesign at macports.org
      Type:  defect            |      Status:  new                    
  Priority:  Normal            |   Milestone:  Port Bugs              
 Component:  ports             |     Version:  1.6.0                  
Resolution:                    |    Keywords:  circular               
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Comment (by nox at macports.org):

 Mine did find GTK, I noticed that bug because I was trying to build
 libpixman universally when GTK was not installed with +universal variant.
 I was on 10.5.2 using the latest Xcode.

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Ticket URL: <http://trac.macports.org/ticket/15333#comment:2>
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