[MacPorts] #16574: Portfiles need to be able to declare a dependency on a base version

[MacPorts]

#16574: Portfiles need to be able to declare a dependency on a base version
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  Reporter:  macosforge.org at beej.org  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement              |      Status:  new                                  
  Priority:  Normal                   |   Milestone:  MacPorts base enhancements           
 Component:  base                     |     Version:  1.6.0                                
Resolution:                           |    Keywords:                                       
      Port:                           |  
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Comment(by ryandesign at macports.org):

 But we've broken the Portfile syntax in many releases by introducing new
 keywords which previous versions of MacPorts can't parse, yet we haven't
 ever increased the value of PortSystem beyond 1.0.

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Ticket URL: <http://trac.macports.org/ticket/16574#comment:4>
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