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2014-10-24 06:32:12 -0600	received badge	● Self-Learner (source)
2014-10-23 16:47:31 -0600	answered a question	build error: undefined reference to 'v4l2_munmap' I installed ubuntu 14.04 x64 inside of a vbox machine and installed all packaged listed here. It worked, I was able to compile opencv-3.0.0. Then I copied the .jar file and the lib folder into my fedora 20, linked it to my java application and it worked too.
2014-10-23 08:18:34 -0600	commented question	build error: undefined reference to 'v4l2_munmap' I thought it could be by the libraries version, I am using fedora 20. So I installed a vbox machine with fedora 21 alpha (it practically has all libraries at the latest version) and installed all dependencies (at least all packages I thought that are required). However the issue persists.
2014-10-22 12:54:07 -0600	commented question	build error: undefined reference to 'v4l2_munmap' I updated it to the 1.6.0 version and the issue persists.
2014-10-21 13:12:49 -0600	received badge	● Editor (source)
2014-10-21 08:46:18 -0600	commented question	build error: undefined reference to 'v4l2_munmap' Yes, I am building the 3.0 branch (I forgot to tell....). I did a git clone https://github.com/Itseez/opencv.git and then ran CMAKE.
2014-10-20 18:23:48 -0600	asked a question	build error: undefined reference to 'v4l2_munmap' I am compiling the latest version of opencv from github under fedora 20 x86_64. A few weeks ago I built opencv-2.4.9 in the same machine so I think I have all the libraries installed properly or at least that i thought... The cmake command that I used is: `cmake -DBUILD_SHARED_LIBS=OFF -DWITH_TBB=on -DWITH_JAVA=on ..` But in the building process I get this error: `/usr/bin/ld: ../../lib/libopencv_videoio.a(cap_libv4l.cpp.o): undefined reference to symbol 'v4l2_munmap' /usr/bin/ld: note: 'v4l2_munmap' is defined in DSO /lib64/libv4l2.so.0 so try adding it to the linker command line /lib64/libv4l2.so.0: could not read symbols: Invalid operation collect2: error: ld returned 1 exit status make[2]: * [bin/opencv_perf_videoio] Error 1 make[1]: * [modules/videoio/CMakeFiles/opencv_perf_videoio.dir/all] Error 2` Does anybody know about this? EDIT: General configuration for opencv-3.0.0 is: -- The CXX compiler identification is GNU 4.8.3 -- The C compiler identification is GNU 4.8.3 -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detected version of GNU GCC: 48 (408) -- Performing Test HAVE_CXX_FSIGNED_CHAR -- Performing Test HAVE_CXX_FSIGNED_CHAR - Success -- Performing Test HAVE_C_FSIGNED_CHAR -- Performing Test HAVE_C_FSIGNED_CHAR - Success -- Performing Test HAVE_CXX_W -- Performing Test HAVE_CXX_W - Success -- Performing Test HAVE_C_W -- Performing Test HAVE_C_W - Success -- Performing Test HAVE_CXX_WALL -- Performing Test HAVE_CXX_WALL - Success -- Performing Test HAVE_C_WALL -- Performing Test HAVE_C_WALL - Success -- Performing Test HAVE_CXX_WERROR_RETURN_TYPE -- Performing Test HAVE_CXX_WERROR_RETURN_TYPE - Success -- Performing Test HAVE_C_WERROR_RETURN_TYPE -- Performing Test HAVE_C_WERROR_RETURN_TYPE - Success -- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR -- Performing Test HAVE_CXX_WERROR_NON_VIRTUAL_DTOR - Success -- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR -- Performing Test HAVE_C_WERROR_NON_VIRTUAL_DTOR - Success -- Performing Test HAVE_CXX_WERROR_ADDRESS -- Performing Test HAVE_CXX_WERROR_ADDRESS - Success -- Performing Test HAVE_C_WERROR_ADDRESS -- Performing Test HAVE_C_WERROR_ADDRESS - Success -- Performing Test HAVE_CXX_WERROR_SEQUENCE_POINT -- Performing Test HAVE_CXX_WERROR_SEQUENCE_POINT - Success -- Performing Test HAVE_C_WERROR_SEQUENCE_POINT -- Performing Test HAVE_C_WERROR_SEQUENCE_POINT - Success -- Performing Test HAVE_CXX_WFORMAT -- Performing Test HAVE_CXX_WFORMAT - Success -- Performing Test HAVE_C_WFORMAT -- Performing Test HAVE_C_WFORMAT - Success -- Performing Test HAVE_CXX_WERROR_FORMAT_SECURITY -- Performing Test HAVE_CXX_WERROR_FORMAT_SECURITY - Success -- Performing Test HAVE_C_WERROR_FORMAT_SECURITY -- Performing Test HAVE_C_WERROR_FORMAT_SECURITY - Success -- Performing Test HAVE_CXX_WMISSING_DECLARATIONS -- Performing Test HAVE_CXX_WMISSING_DECLARATIONS - Success -- Performing Test HAVE_C_WMISSING_DECLARATIONS -- Performing Test HAVE_C_WMISSING_DECLARATIONS - Success -- Performing Test HAVE_CXX_WMISSING_PROTOTYPES -- Performing Test HAVE_CXX_WMISSING_PROTOTYPES - Failed -- Performing Test HAVE_C_WMISSING_PROTOTYPES -- Performing Test HAVE_C_WMISSING_PROTOTYPES - Success -- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES -- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES - Failed -- Performing Test HAVE_C_WSTRICT_PROTOTYPES -- Performing Test HAVE_C_WSTRICT_PROTOTYPES - Success -- Performing Test HAVE_CXX_WUNDEF -- Performing Test HAVE_CXX_WUNDEF - Success -- Performing Test HAVE_C_WUNDEF -- Performing Test HAVE_C_WUNDEF - Success -- Performing Test HAVE_CXX_WINIT_SELF -- Performing Test HAVE_CXX_WINIT_SELF - Success -- Performing Test HAVE_C_WINIT_SELF -- Performing Test HAVE_C_WINIT_SELF - Success -- Performing Test HAVE_CXX_WPOINTER_ARITH -- Performing Test HAVE_CXX_WPOINTER_ARITH - Success -- Performing Test HAVE_C_WPOINTER_ARITH -- Performing Test HAVE_C_WPOINTER_ARITH - Success -- Performing Test HAVE_CXX_WSHADOW -- Performing Test HAVE_CXX_WSHADOW - Success -- Performing Test HAVE_C_WSHADOW -- Performing Test HAVE_C_WSHADOW - Success -- Performing Test HAVE_CXX_WSIGN_PROMO -- Performing Test HAVE_CXX_WSIGN_PROMO - Success -- Performing Test HAVE_C_WSIGN_PROMO -- Performing Test HAVE_C_WSIGN_PROMO - Failed -- Performing Test HAVE_CXX_WNO_NARROWING -- Performing Test HAVE_CXX_WNO_NARROWING - Success -- Performing Test HAVE_C_WNO_NARROWING -- Performing Test HAVE_C_WNO_NARROWING - Success -- Performing Test HAVE_CXX_WNO_DELETE_NON_VIRTUAL_DTOR -- Performing Test HAVE_CXX_WNO_DELETE_NON_VIRTUAL_DTOR - Success -- Performing Test HAVE_C_WNO_DELETE_NON_VIRTUAL_DTOR -- Performing Test HAVE_C_WNO_DELETE_NON_VIRTUAL_DTOR - Failed -- Performing Test HAVE_CXX_WNO_UNNAMED_TYPE_TEMPLATE_ARGS -- Performing Test ... 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