[MacPorts] #28023: qt3 fails to build with libpng 1.4

[MacPorts]

#28023: qt3 fails to build with libpng 1.4
---------------------------------+------------------------------------------
 Reporter:  dports@…             |       Owner:  macports-tickets@…                   
     Type:  defect               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  1.9.2                                
 Keywords:                       |        Port:  qt3                                  
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 qt3 appears to use libpng APIs that aren't compatible with libpng 1.4. It
 fails with the attached log. Partial exerpt of the errors:

 {{{
 :info:build g++-4.2 -c -pipe -arch x86_64
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_svn.macports.org_trunk_dports_x11_qt3/work/qt-x11-free-3.3.8/include
 -I/opt/local/include -fno-exceptions -Wall -W -Os -fPIC  -D__DARWIN_X11__
 -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_PLUGIN -DQT_SHARED
 -I/opt/local/var/macports/build/_opt_local_var_macports_sources_svn.macports.org_trunk_dports_x11_qt3/work/qt-x11-free-3.3.8/mkspecs/darwin-g++
 -I. -I/opt/local/include/freetype2 -I/opt/local/lib/qt3/include
 -I../../../../include -I/opt/local/include -I/opt/local/include -I.moc
 /release-shared-mt/ -o .obj/release-shared-mt/main.o main.cpp
 :info:build In file included from main.cpp:11:
 :info:build ../../../../src/kernel/qpngio.cpp: In function 'void
 setup_qt(QImage&, png_struct*, png_info*, float)':
 :info:build ../../../../src/kernel/qpngio.cpp:128: warning: 'channels' is
 deprecated (declared at /opt/local/include/png.h:672)
 :info:build ../../../../src/kernel/qpngio.cpp:128: warning: 'channels' is
 deprecated (declared at /opt/local/include/png.h:672)
 :info:build ../../../../src/kernel/qpngio.cpp:162: error: 'struct
 png_info_struct' has no member named 'trans_values'
 :info:build ../../../../src/kernel/qpngio.cpp:171: warning: 'num_palette'
 is deprecated (declared at /opt/local/include/png.h:655)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/28023>
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