[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@…):

 Please run this script to check for ports referencing libpng12.

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Ticket URL: <https://trac.macports.org/ticket/28032#comment:7>
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