[MacPorts] #29357: circular dependency between doxygen and xorg-libxcb

[MacPorts]

#29357: circular dependency between doxygen and xorg-libxcb
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 Reporter:  dan@…            |       Owner:  jeremyhu@…           
     Type:  defect           |      Status:  new                  
 Priority:  Normal           |   Milestone:                       
Component:  ports            |     Version:  1.9.2                
 Keywords:                   |        Port:  xorg-libxcb          
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Comment(by dan@…):

 I worked around the problem by removing the "doc" subdirectory from the
 declaration of subdirs in the Makefile.
 So things build now.  You'll probably need to rebuild on a scrubbed system
 to see the bug.

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Ticket URL: <https://trac.macports.org/ticket/29357#comment:3>
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