[MacPorts] #21184: graphviz @2.24.0 Unable to build

[MacPorts]

#21184: graphviz @2.24.0 Unable to build
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 Reporter:  nicolas.forquet@…          |       Owner:  ryandesign@…           
     Type:  defect                     |      Status:  new                    
 Priority:  Normal                     |   Milestone:                         
Component:  ports                      |     Version:  1.8.0                  
 Keywords:                             |        Port:  graphviz               
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Comment(by ryandesign@…):

 `/usr/include/Availability.h` should exist. It is provided by Apple, but
 I'm not sure whether it's part of the OS or part of Xcode. Try
 reinstalling Xcode 3.1.3 since that's easier than reinstalling the OS.

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Ticket URL: <http://trac.macports.org/ticket/21184#comment:5>
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