[MacPorts] #15161: depends_* should have more useful semantics

[MacPorts]

#15161: depends_* should have more useful semantics
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  Reporter:  jmr at macports.org  |       Owner:  macports-tickets at lists.macosforge.org
      Type:  enhancement       |      Status:  new                                  
  Priority:  Normal            |   Milestone:  MacPorts base enhancements           
 Component:  base              |     Version:  1.7.0                                
Resolution:                    |    Keywords:  dependencies                         
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Comment (by raimue at macports.org):

 This is related to at least the following ports:
   * '''texinfo''' (using lzmautils in extract phase), see #16220
   * '''ffmpeg''' (using svn in fetch phase), see r36509 and r36295

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Ticket URL: <http://trac.macports.org/ticket/15161#comment:7>
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