[MacPorts] #33510: libpixman +universal is missing dependency on libpng +universal

[MacPorts]

#33510: libpixman +universal is missing dependency on libpng +universal
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 Reporter:  kurtjaeke@…       |       Owner:  macports-tickets@…                   
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  2.0.4                                
 Keywords:  universal         |        Port:  libpixman                            
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 Trying to build libpixman in variant +universal fails with linker errors
 if libpng is not installed in the same variant.

 Please add variants dependency to libpng.

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Ticket URL: <https://trac.macports.org/ticket/33510>
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