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cmake not picking GStreamer on Ubuntu

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Hi I want to build opencv with GStreamer support. I built the GStreamer from source (version 1.8.1) following this guide: http://kacianka.at/?p=145 I have 'gstreamer_build' folder at my home directory and it contains 'bin' folder with these: > gst-device-monitor-1.0 > gst-discoverer-1.0 gst-inspect-1.0 > gst-launch-1.0 gst-play-1.0 > gst-stats-1.0 gst-typefind-1.0 > orc-bugreport orcc I have this path added to my environment variable PATH. When I use cmake like: > cmake -D CMAKE_BUILD_TYPE=RELEASE -D> CMAKE_INSTALL_PREFIX=/usr/local -D> OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules -D BUILD_opencv_python3=ON -D WITH_GSTREAMER=ON -D WITH_FFMPEG=OFF> .. I get the following output clearly indicating that gstreamer is not found: -- checking for module 'gstreamer-base-1.0' -- package 'gstreamer-base-1.0' not found -- checking for module 'gstreamer-video-1.0' -- package 'gstreamer-video-1.0' not found -- checking for module 'gstreamer-app-1.0' -- package 'gstreamer-app-1.0' not found -- checking for module 'gstreamer-riff-1.0' -- package 'gstreamer-riff-1.0' not found -- checking for module 'gstreamer-pbutils-1.0' -- package 'gstreamer-pbutils-1.0' not found -- checking for module 'gstreamer-base-0.10' -- package 'gstreamer-base-0.10' not found -- checking for module 'gstreamer-video-0.10' -- package 'gstreamer-video-0.10' not found -- checking for module 'gstreamer-app-0.10' -- package 'gstreamer-app-0.10' not found -- checking for module 'gstreamer-riff-0.10' -- package 'gstreamer-riff-0.10' not found -- checking for module 'gstreamer-pbutils-0.10' -- package 'gstreamer-pbutils-0.10' not found and this: Video I/O: -- DC1394 1.x: NO -- DC1394 2.x: NO -- FFMPEG: NO -- codec: NO -- format: NO -- util: NO -- swscale: NO -- resample: NO -- gentoo-style: NO -- GStreamer: NO -- OpenNI: NO -- OpenNI PrimeSensor Modules: NO -- OpenNI2: NO -- PvAPI: NO -- GigEVisionSDK: NO -- UniCap: NO -- UniCap ucil: NO -- V4L/V4L2: Using libv4l1 (ver 1.0.1) / libv4l2 (ver 1.0.1) -- XIMEA: NO -- Xine: NO -- gPhoto2: NO Can anyone help me with this?

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