[MacPorts] #28032: rrdtool 1.4.4_1 fails to compile with libpng 1.4

[MacPorts]

#28032: rrdtool 1.4.4_1 fails to compile with libpng 1.4
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 Reporter:  sck@…          |       Owner:  markd@…           
     Type:  defect         |      Status:  new               
 Priority:  Normal         |   Milestone:                    
Component:  ports          |     Version:  1.9.2             
 Keywords:                 |        Port:  rrdtool           
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Comment(by jmr@…):

 Rev bumped those that still needed it in r75294. I also corrected an
 include path that was being used in rrdtool and added a pkgconfig
 dependency in r75295, though it built fine for me before that.

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Ticket URL: <https://trac.macports.org/ticket/28032#comment:9>
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