This line was added to CMakeLists.txt OCV_OPTION(WITH_GSTREAMER_0_10 "Enable Gstreamer 0.10 support (instead of 1.x)" OFF ) With USE='-gstreamer' libopencv_highgui.so links to gst libs: $ objdump -p /usr/lib64/libopencv_highgui.so.2.4.10|grep NEEDED|sort NEEDED libavcodec.so.56 NEEDED libavformat.so.56 NEEDED libavutil.so.54 NEEDED libc.so.6 NEEDED libgcc_s.so.1 NEEDED libglib-2.0.so.0 NEEDED libGL.so.1 NEEDED libgobject-2.0.so.0 NEEDED libgstapp-0.10.so.0 NEEDED libgstpbutils-0.10.so.0 NEEDED libgstreamer-0.10.so.0 NEEDED libgstriff-0.10.so.0 NEEDED libgstvideo-0.10.so.0 NEEDED libHalf.so.11 NEEDED libIlmImf-Imf_2_1.so.21 NEEDED libjasper.so.1 NEEDED libjpeg.so.62 NEEDED libm.so.6 NEEDED libopencv_core.so.2.4 NEEDED libpng16.so.16 NEEDED libpthread.so.0 NEEDED libQtCore.so.4 NEEDED libQtGui.so.4 NEEDED libQtOpenGL.so.4 NEEDED libQtTest.so.4 NEEDED libstdc++.so.6 NEEDED libswscale.so.3 NEEDED libtiff.so.5 NEEDED libv4l1.so.0 NEEDED libv4l2.so.0 $ check-deps.sh media-libs/opencv * Checking "media-libs/opencv-2.4.10" * Missing in RDEPEND and DEPEND: dev-libs/glib X86_64;libglib-2.0.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 X86_64;libgobject-2.0.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 dev-qt/qtcore X86_64;libQtCore.so.4 /usr/lib64/libopencv_highgui.so.2.4.10 media-libs/gst-plugins-base X86_64;libgstapp-0.10.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 X86_64;libgstpbutils-0.10.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 X86_64;libgstriff-0.10.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 X86_64;libgstvideo-0.10.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 media-libs/gstreamer X86_64;libgstreamer-0.10.so.0 /usr/lib64/libopencv_highgui.so.2.4.10 media-libs/ilmbase X86_64;libHalf.so.11 /usr/lib64/libopencv_highgui.so.2.4.10 * Nothing links to libraries from these packages: app-arch/bzip2 * Nothing links to libraries from RDEPEND of these virtuals: virtual/glu
