[MacPorts] #14141: Variant names cannot contain hyphens; guide should mention this

[MacPorts]

#14141: Variant names cannot contain hyphens; guide should mention this
-------------------------------------+--------------------------------------
 Reporter:  ryandesign at macports.org  |       Owner:  markd at macports.org     
     Type:  defect                   |      Status:  new                    
 Priority:  Normal                   |   Milestone:  Website & Documentation
Component:  guide                    |     Version:  1.6.0                  
 Keywords:                           |  
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 Variant names may not contain a hyphen. (For example: "`variant no-x11`"
 would be wrong.) Underscores should be used instead (e.g. "`variant
 no_x11`"). The guide should mention this in the section on writing
 portfiles.

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Ticket URL: <http://trac.macosforge.org/projects/macports/ticket/14141>
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