[MacPorts] #18254: pTeX fails to build on Mac OS X 10.4.11

[MacPorts]

#18254: pTeX fails to build on Mac OS X 10.4.11
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 Reporter:  ryusuke.numata@…          |       Owner:  takanori@…           
     Type:  defect                    |      Status:  new                  
 Priority:  Normal                    |   Milestone:  Port Bugs            
Component:  ports                     |     Version:  1.7.0                
 Keywords:                            |        Port:  pTeX                 
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Comment(by ryusuke.numata@…):

 I also needed a similar hack to dvipng.
 The following files works for me.

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Ticket URL: <http://trac.macports.org/ticket/18254#comment:4>
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