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  4. [SOLVED] Qt 5 build, linker error
Forum Update on Monday, May 27th 2025

[SOLVED] Qt 5 build, linker error

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  • C Offline
    C Offline
    chrisco
    wrote on 26 Apr 2013, 12:59 last edited by
    #1

    I am building Qt5 from Git using the article on the Qt site:
    http://qt-project.org/wiki/Building_Qt_5_from_Git

    I get this linker error:

    .obj/debug-shared/qpnghandler.o: In function QPngHandlerPrivate::readPngHeader()': /home/coppensc/qt5/qtbase/src/gui/image/qpnghandler.cpp:538: undefined reference to png_set_longjmp_fn'
    .obj/debug-shared/qpnghandler.o: In function QPngHandlerPrivate::readPngImage(QImage*)': /home/coppensc/qt5/qtbase/src/gui/image/qpnghandler.cpp:564: undefined reference to png_set_longjmp_fn'
    .obj/debug-shared/qpnghandler.o: In function QPNGImageWriter::writeImage(QImage const&, int, QString const&, int, int)': /home/coppensc/qt5/qtbase/src/gui/image/qpnghandler.cpp:818: undefined reference to png_set_longjmp_fn# "

    Anybody have any ideas how to solve this?

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    • T Offline
      T Offline
      tpham3783
      wrote on 26 Apr 2013, 15:22 last edited by
      #2

      longjmp is only supported in libpng 1.5. You need to upgrade libpng to version 1.5

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      • C Offline
        C Offline
        chrisco
        wrote on 29 Apr 2013, 07:29 last edited by
        #3

        Thank you, that helped!

        1 Reply Last reply
        0

        2/3

        26 Apr 2013, 15:22

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