[MacPorts] #29466: Portfile should contain information about OSX compatible versions

[MacPorts]

#29466: Portfile should contain information about OSX compatible versions
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 Reporter:  rudloff@…            |       Owner:  macports-tickets@…                   
     Type:  enhancement          |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  base                 |     Version:  1.9.2                                
 Keywords:                       |        Port:                                       
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 I still use Tiger so there are some ports I can't build.[[BR]]
 The problem is that MacPorts will first download all the dependencies
 before telling me I can't install the port.[[BR]]
 So there should be some kind of check at the very beginning of the
 install.

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Ticket URL: <https://trac.macports.org/ticket/29466>
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