[MacPorts] #22127: doxygen 1.6.1_0+docs may fail to build unless use_parallel_build no set in Portfile

[MacPorts]

#22127: doxygen 1.6.1_0+docs may fail to build unless use_parallel_build no set in
Portfile
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 Reporter:  dbueno@…          |       Owner:  macports-tickets@…                   
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  1.8.1                                
 Keywords:                    |        Port:  doxygen                              
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 Attempting to build doxygen resulted in a compilation error, and in the
 message I noticed that `make -j2` had been called. So I went in and added
 `use_parallel_build no` in the portfile, cleaned the port, and rebuilt.
 The port then built and installed fine.

 I am on 10.5.7 using Xcode 3.1.4 on a dual 2.5GHz G5.

 Just adding the line at the bottom fixes my issue.

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Ticket URL: <http://trac.macports.org/ticket/22127>
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