[MacPorts] #18386: Guide Has No PortGroup Invocation Example

[MacPorts]

#18386: Guide Has No PortGroup Invocation Example
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 Reporter:  rmsfisher@…             |       Owner:  markd@…           
     Type:  defect                  |      Status:  new               
 Priority:  Normal                  |   Milestone:  Port Bugs         
Component:  guide                   |     Version:  1.7.0             
 Keywords:  PortGroup               |        Port:                    
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 The guide goes to lengths to explain what various PortGroups do but never
 explains how to write a PortGroup line in a Portfile.

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Ticket URL: <http://trac.macports.org/ticket/18386>
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