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Thread: /libQt5WebKit.so: undefined reference to `gst_x_overlay_set_window_handle'

  1. 30th April 2016, 13:04 #1
    rahulvishwakarma
    rahulvishwakarma is offline Novice
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    Default /libQt5WebKit.so: undefined reference to `gst_x_overlay_set_window_handle'

    hi to all,
    I've centos6.6(x86) and qt5.3.2. I am porting a program
    form qt4 to qt5. and having this problem ( compiler output ) :-
    Qt Code: 
    1. 5:20:29: Running steps for project clipgrab...
    2. 15:20:29: Configuration unchanged, skipping qmake step.
    3. 15:20:29: Starting: "/usr/bin/make" 
    4. g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIE -DCLIPGRAB_VERSION=3.5.6 -DQT_NO_DEBUG -DQT_WEBKITWIDGETS_LIB -DQT_WEBKIT_LIB -DQT_WIDGETS_LIB -DQT_XML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt5.3.2/5.3/gcc/mkspecs/linux-g++ -I. -I. -I../../Qt5.3.2/5.3/gcc/include -I../../Qt5.3.2/5.3/gcc/include/QtWebKitWidgets -I../../Qt5.3.2/5.3/gcc/include/QtWebKit -I../../Qt5.3.2/5.3/gcc/include/QtWidgets -I../../Qt5.3.2/5.3/gcc/include/QtXml -I../../Qt5.3.2/5.3/gcc/include/QtNetwork -I../../Qt5.3.2/5.3/gcc/include/QtGui -I../../Qt5.3.2/5.3/gcc/include/QtCore -I. -I. -o main.o main.cpp
    5. g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIE -DCLIPGRAB_VERSION=3.5.6 -DQT_NO_DEBUG -DQT_WEBKITWIDGETS_LIB -DQT_WEBKIT_LIB -DQT_WIDGETS_LIB -DQT_XML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt5.3.2/5.3/gcc/mkspecs/linux-g++ -I. -I. -I../../Qt5.3.2/5.3/gcc/include -I../../Qt5.3.2/5.3/gcc/include/QtWebKitWidgets -I../../Qt5.3.2/5.3/gcc/include/QtWebKit -I../../Qt5.3.2/5.3/gcc/include/QtWidgets -I../../Qt5.3.2/5.3/gcc/include/QtXml -I../../Qt5.3.2/5.3/gcc/include/QtNetwork -I../../Qt5.3.2/5.3/gcc/include/QtGui -I../../Qt5.3.2/5.3/gcc/include/QtCore -I. -I. -o mainwindow.o mainwindow.cpp
    6. mainwindow.cpp: In member function 'void MainWindow::on_downloadTree_customContextMenuRequested(const QPoint&)':
    7. mainwindow.cpp:817:22: warning: unused variable 'item' [-Wunused-variable]
    8.      QTreeWidgetItem* item = ui.downloadTree->itemAt(pos);
    9.                       ^
    10. /opt/Qt5.3.2/5.3/gcc/bin/moc -DCLIPGRAB_VERSION=3.5.6 -DQT_NO_DEBUG -DQT_WEBKITWIDGETS_LIB -DQT_WEBKIT_LIB -DQT_WIDGETS_LIB -DQT_XML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I/opt/Qt5.3.2/5.3/gcc/mkspecs/linux-g++ -I/opt/software/clipgrab-3.5.6 -I/opt/software/clipgrab-3.5.6 -I/opt/Qt5.3.2/5.3/gcc/include -I/opt/Qt5.3.2/5.3/gcc/include/QtWebKitWidgets -I/opt/Qt5.3.2/5.3/gcc/include/QtWebKit -I/opt/Qt5.3.2/5.3/gcc/include/QtWidgets -I/opt/Qt5.3.2/5.3/gcc/include/QtXml -I/opt/Qt5.3.2/5.3/gcc/include/QtNetwork -I/opt/Qt5.3.2/5.3/gcc/include/QtGui -I/opt/Qt5.3.2/5.3/gcc/include/QtCore mainwindow.h -o moc_mainwindow.cpp
    11. g++ -c -pipe -O2 -Wall -W -D_REENTRANT -fPIE -DCLIPGRAB_VERSION=3.5.6 -DQT_NO_DEBUG -DQT_WEBKITWIDGETS_LIB -DQT_WEBKIT_LIB -DQT_WIDGETS_LIB -DQT_XML_LIB -DQT_NETWORK_LIB -DQT_GUI_LIB -DQT_CORE_LIB -I../../Qt5.3.2/5.3/gcc/mkspecs/linux-g++ -I. -I. -I../../Qt5.3.2/5.3/gcc/include -I../../Qt5.3.2/5.3/gcc/include/QtWebKitWidgets -I../../Qt5.3.2/5.3/gcc/include/QtWebKit -I../../Qt5.3.2/5.3/gcc/include/QtWidgets -I../../Qt5.3.2/5.3/gcc/include/QtXml -I../../Qt5.3.2/5.3/gcc/include/QtNetwork -I../../Qt5.3.2/5.3/gcc/include/QtGui -I../../Qt5.3.2/5.3/gcc/include/QtCore -I. -I. -o moc_mainwindow.o moc_mainwindow.cpp
    12. g++ -Wl,-O1 -Wl,-rpath,/opt/Qt5.3.2/5.3/gcc -Wl,-rpath,/opt/Qt5.3.2/5.3/gcc/lib -Wl,-rpath-link,/opt/Qt5.3.2/5.3/gcc/lib -o clipgrab clipgrab.o converter.o converter_copy.o converter_ffmpeg.o main.o mainwindow.o video.o video_youtube.o video_dailymotion.o video_vimeo.o video_myvideo.o video_myspass.o video_clipfish.o video_heuristic.o video_metacafe.o http_handler.o notifications.o qrc_resources.o moc_clipgrab.o moc_converter.o moc_converter_copy.o moc_converter_ffmpeg.o moc_mainwindow.o moc_video.o moc_video_youtube.o moc_video_dailymotion.o moc_video_vimeo.o moc_video_myvideo.o moc_video_clipfish.o moc_video_heuristic.o moc_video_metacafe.o moc_http_handler.o   -L/opt/Qt5.3.2/5.3/gcc/lib -lQt5WebKitWidgets -lQt5WebKit -lQt5Widgets -lQt5Xml -lQt5Network -lQt5Gui -lQt5Core -lGL -lpthread 
    13. /opt/Qt5.3.2/5.3/gcc/lib/libQt5WebKit.so: undefined reference to `gst_x_overlay_set_window_handle'
    14. /opt/Qt5.3.2/5.3/gcc/lib/libQt5WebKit.so: undefined reference to `gst_query_parse_nth_buffering_range'
    15. /opt/Qt5.3.2/5.3/gcc/lib/libQt5WebKit.so: undefined reference to `gst_element_link_pads_full'
    16. /opt/Qt5.3.2/5.3/gcc/lib/libQt5WebKit.so: undefined reference to `gst_is_initialized'
    17. /opt/Qt5.3.2/5.3/gcc/lib/libQt5WebKit.so: undefined reference to `gst_query_get_n_buffering_ranges'
    18. collect2: error: ld returned 1 exit status
    19. make: *** [clipgrab] Error 1
    20. 15:20:43: The process "/usr/bin/make" exited with code 2.
    21. Error while building/deploying project clipgrab (kit: Desktop Qt 5.3 GCC 32bit)
    22. When executing step "Make"
    23. 15:20:43: Elapsed time: 00:14.
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    how to solve it.
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  2. 30th April 2016, 16:58 #2
    d_stranz's Avatar
    d_stranz
    d_stranz is offline Guru
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    Default Re: /libQt5WebKit.so: undefined reference to `gst_x_overlay_set_window_handle'

    how to solve it.
    Add the library where the gst_* methods are implemented to your linker command. Looks like these are from the GStreamer library. You'll need to install and build GStreamer if you don't already have it, and edit your project .pro file to add the proper commands to the LIBS line, probably something like this:

    Qt Code: 
    1. LIBS += -L"<path to GStreamer library>" -l<name of GStreamer library>
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    Where of course, you substitute the actual path and name for the stuff inside the <> above. If the library is named libGStreamer.a, or libgst.a, you simply put -lGStreamer or -lgst for the library name.
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  3. The following user says thank you to d_stranz for this useful post:

    rahulvishwakarma (15th March 2020)
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