[MacPorts] #24318: Document how to get the result of a program from within a Portfile

[MacPorts]

#24318: Document how to get the result of a program from within a Portfile
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 Reporter:  mattiafrancescomoro@…          |       Owner:  markd@…           
     Type:  enhancement                    |      Status:  new               
 Priority:  Normal                         |   Milestone:                    
Component:  guide                          |     Version:                    
 Keywords:                                 |        Port:                    
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Comment(by mattiafrancescomoro@…):

 Thank you

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Ticket URL: <http://trac.macports.org/ticket/24318#comment:4>
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