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i removed libavcodec with $ sudo apt-get remove libavcodec* $ rm /usr/local/lib/libav* but still it doesn't wrk $ cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local .. $ make ... [ 9%] Built target pch_Generate_opencv_highgui Linking CXX shared library ../../lib/libopencv_highgui.so /usr/bin/ld: cannot find -lavcodec collect2: ld returned 1 exit status make[2]: * [lib/libopencv_highgui.so.2.4.5] Error 1 make[1]: [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2 make: ** [all] Error 2

Linking CXX shared library ../../lib/libopencv_highgui.so /usr/bin/ld: cannot find -lavcodec collect2: ld returned 1 exit status make[2]: * [lib/libopencv_highgui.so.2.4.5] Error 1 make[1]: [modules/highgui/CMakeFiles/opencv_highgui.dir/all] Error 2 make: ** [all] Error 2

[ 0%] Built target pch_Generate_opencv_core [ 3%] Built target opencv_core [ 4%] Built target opencv_ts_pch_dephelp [ 4%] Built target pch_Generate_opencv_ts [ 4%] Built target opencv_imgproc_pch_dephelp [ 4%] Built target pch_Generate_opencv_imgproc [ 9%] Built target opencv_imgproc [ 9%] Built target opencv_flann_pch_dephelp [ 9%] Built target pch_Generate_opencv_flann [ 9%] Built target opencv_flann [ 9%] Built target opencv_highgui_pch_dephelp [ 9%] Built target pch_Generate_opencv_highgui Linking CXX shared library ../../lib/libopencv_highgui.so /usr/bin/ld: cannot find -lavcodec

I uninstalled libavcodec $ sudo apt-get remove libavcodec-dev libavcodec-extra-52 libavcodec-unstripped-52 libavcodec52
Reading package lists... Done Building dependency tree
Reading state information... Done Package libavcodec-dev is not installed, so not removed Package libavcodec-extra-52 is not installed, so not removed Package libavcodec-unstripped-52 is not installed, so not removed Package libavcodec52 is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 310 not upgraded.

then I checked /usr/local/lib $ ls /usr/local/lib/libavls: cannot access /usr/local/lib/libav: No such file or directory

But still it doesn't work... It seems to need avcodec! $ make [ 0%] Built target opencv_core_pch_dephelp [ 0%] Built target pch_Generate

how do you think to fix it? I'm desperate

Hi all I am trying to install opencv on a ubuntu 10.04 x86_64. I followed these instructions link text but when I run make I got this message

> make [  0%]
> Built target opencv_core_pch_dephelp [  0%]
> Built target pch_Generate_opencv_core [  3%]
> Built target opencv_core [  4%]
> Built target opencv_ts_pch_dephelp [  4%]
> Built target pch_Generate_opencv_ts [ 4%]
> Built target opencv_imgproc_pch_dephelp [  4%]
> Built target pch_Generate_opencv_imgproc [  9%]
> Built target opencv_imgproc [  9%]
> Built target opencv_flann_pch_dephelp [  9%]
> Built target pch_Generate_opencv_flann [  9%]
> Built target opencv_flann [  9%]
> Built target opencv_highgui_pch_dephelp [ 9%]
> Built target pch_Generate_opencv_highgui
> Linking CXX shared library ../../lib/libopencv_highgui.so
> /usr/bin/ld:
> /usr/local/lib/libavcodec.a(avpacket.o):
> relocation R_X86_64_32 against
> `.rodata.str1.1' can not be used when
> making a shared object; recompile with
> -fPIC /usr/local/lib/libavcodec.a: could not read symbols: Bad value
> collect2: ld returned 1 exit status
> make[2]: ***
> [lib/libopencv_highgui.so.2.4.5] Error
> 1 make[1]: ***
> [modules/highgui/CMakeFiles/opencv_highgui.dir/all]
> Error 2 make: *** [all] Error 2