[MacPorts] #34730: LibVNCServer: build +universal fails

[MacPorts]

#34730: LibVNCServer: build +universal fails
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 Reporter:  pixilla@…             |       Owner:  ryandesign@…           
     Type:  defect                |      Status:  assigned               
 Priority:  Normal                |   Milestone:                         
Component:  ports                 |     Version:  2.1.1                  
 Keywords:                        |        Port:  LibVNCServer           
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Comment(by pixilla@…):

 LibVNCServer is picking up MacPorts gtk2 if present and on my system this
 fails to build.

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Ticket URL: <https://trac.macports.org/ticket/34730#comment:2>
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