[MacPorts] #15077: Document that installing other software in /usr/local can break ports

[MacPorts]

#15077: Document that installing other software in /usr/local can break ports
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 Reporter:  ryandesign@…             |       Owner:  markd@…           
     Type:  enhancement              |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  guide                    |     Version:                    
 Keywords:                           |        Port:                    
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Comment(by ryandesign@…):

 MacPorts 1.8.0 prevents using /usr/local as prefix.

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Ticket URL: <http://trac.macports.org/ticket/15077#comment:3>
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