[MacPorts] #18748: doxygen build phase conflicts with libwww

[MacPorts]

#18748: doxygen build phase conflicts with libwww
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 Reporter:  brett@…             |       Owner:  css@…           
     Type:  defect              |      Status:  assigned        
 Priority:  Normal              |   Milestone:                  
Component:  ports               |     Version:  1.7.0           
 Keywords:                      |        Port:  doxygen         
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Comment(by css@…):

 Replying to [comment:10 ryandesign@…]:
 > {{{
 > conflicts libwww
 > }}}

 That seems like it would be prohibitive, as it would prevent having the
 two ports coexist at all, right?

 Is there an easy way from a Portfile to check that a particular port is
 already installed? (Or would I need to check whether a file from libwww
 exists in the prefix?)

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Ticket URL: <http://trac.macports.org/ticket/18748#comment:11>
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