[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:
 Component:  guide         |    Version:  1.6.0
Resolution:                |   Keywords:
      Port:                |
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Comment (by egall@…):

 Added an entry in the FAQ on the wiki about this:
 [wiki:FAQ?action=diff&version=129 version 129]

 Although that only addresses this point from the OP:
 > - -devel ports install software in the same places as their non-devel
 counterparts, so that -devel ports can satisfy a dependency via the same
 files as the equivalent non-devel port, with the side-effect that you
 cannot have both the -devel and the non-devel port activated at the same
 time

 So I suppose it could be updated to address the rest, as well...

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Ticket URL: <https://trac.macports.org/ticket/14540#comment:7>
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