[MacPorts] #28048: pstoedit fails to compile with libpng 1.4.5

[MacPorts]

#28048: pstoedit fails to compile with libpng 1.4.5
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 Reporter:  alexander.zimmermann@…               |       Owner:  macports-tickets@…                   
     Type:  defect                               |      Status:  new                                  
 Priority:  Normal                               |   Milestone:                                       
Component:  ports                                |     Version:  1.9.2                                
 Keywords:  png                                  |        Port:  pstoedit                             
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Comment(by ryandesign@…):

 Hmm, why are you trying to force an upgrade? It should not require
 forcing; the revision bumps we've been doing should be sufficient. Also,
 single-letter (global) flags (i.e. "-nfu") have no effect unless you put
 them immediately after the word "port".

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Ticket URL: <https://trac.macports.org/ticket/28048#comment:3>
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