[MacPorts] #14540: Document -devel ports

[MacPorts]

#14540: Document -devel ports
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 Reporter:  ryandesign@…             |       Owner:  markd@…                
     Type:  enhancement              |      Status:  new                    
 Priority:  Normal                   |   Milestone:  Website & Documentation
Component:  guide                    |     Version:  1.6.0                  
 Keywords:                           |        Port:                         
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Comment(by ryandesign@…):

 Replying to [ticket:14540 ryandesign@…]:
 >  * ports that depend on ports where both -devel and non-devel versions
 exist should depend on them in such a way that either port will satisfy
 the dependency. For example, instead of depending on "`port:mysql5`"
 (mysql5 would satisfy that dependency but mysql5-devel would not), depend
 on "`path:${prefix}/bin/mysql_config5`" (both mysql5 and mysql5-devel
 would satisfy that dependency).

 There were two bugs in the above: the correct dependency statement would
 be "`path:bin/mysql_config5:mysql5`"

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Ticket URL: <http://trac.macports.org/ticket/14540#comment:2>
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