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2017-03-16 15:25:19 -0600	commented question	ERROR using opencv_contrib with Python 3.x Try the `-D BUILD_NEW_PYTHON_SUPPORT=ON` option. Was having problems last time compiling OpenCV with python3, and that one helped.
2017-03-16 14:08:05 -0600	commented answer	Missing ts from Release build No, it wasn't installed. I copy it manually to the `/usr/local/lib` path and ran `ldconfig` again, but it didn't work. Maybe the library needs to now that it was installed through the `cmake` configuration?
2017-03-16 13:48:07 -0600	commented answer	Missing ts from Release build That is the strange part. I see the `[ 23%] Built target opencv_ts` message in the build log, but it is not in the install log. Also, tried by changing `find_package ( OpenCV REQUIRED opencv_ts )`, assuming that the name of the module may be different, but that didn't work either. Maybe I need an install flag on the `cmake`?
2017-03-16 13:15:35 -0600	commented answer	Missing ts from Release build I added it to the question, including the flags I used to build OpenCV
2017-03-16 11:48:31 -0600	commented answer	Missing ts from Release build I actually tried with `BUILD_TESTS=ON` before, but still `cmake` didn't find it. I tried with `BUILD_opencv_ts=ON` now, and `cmake` says that there is not `ts` inside the library. I see that the `cmake` output says that `ts` will be built, but I don't see any related message in the building or linking logs related to `ts` (maybe it has a different name?). Also, I'm following the pattern in the previous link, `find_package ( OpenCV REQUIRED ts )`, could it be that the name of the module is different for some reason?
2017-03-16 07:30:20 -0600	asked a question	Missing ts from Release build I'm testing the unit test framework of OpenCV, as instructed in here: quentin.bonnard.eu/blog/2013/10/16/Using-OpenCV_s_test_framework_with_CMake/. However, when I want to test the examples the `ts` module is not found in my installation: `CMake Error at /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message): Could NOT find OpenCV (missing: ts) (found version "3.2.0") Call Stack (most recent call first): /usr/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE) /usr/local/share/OpenCV/OpenCVConfig.cmake:260 (find_package_handle_standard_args) test/CMakeLists.txt:5 (find_package)` I compile OpenCV myself. I was wondering if there are any options I need to give to `cmake` to build or include `ts` module on the final libraries. Note that I'm building it with `RELEASE` option. CMake Output cmake \ -D CMAKE_BUILD_TYPE=RELEASE \ -D ENABLE_PRECOMPILED_HEADERS=OFF \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \ -D BUILD_NEW_PYTHON_SUPPORT=ON \ -D WITH_TBB=ON \ -D WITH_QT=ON \ -D WITH_OPENGL=ON \ -D BUILD_TIFF=ON \ -D BUILD_SHARED_LIBS=ON \ -D BUILD_EXAMPLES=ON \ -D BUILD_opencv_ts=ON \ .. -- Detected version of GNU GCC: 62 (602) -- FP16: Feature disabled -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found suitable version "1.2.8", minimum required is "1.2.3") -- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.8") -- Found OpenEXR: /usr/lib/x86_64-linux-gnu/libIlmImf.so -- Looking for linux/videodev.h -- Looking for linux/videodev.h - not found -- Looking for linux/videodev2.h -- Looking for linux/videodev2.h - found -- Looking for sys/videoio.h -- Looking for sys/videoio.h - not found -- Checking for module 'libavresample' -- No package 'libavresample' found -- Checking for module 'libgphoto2' -- No package 'libgphoto2' found -- A library with BLAS API not found. Please specify library location. -- LAPACK requires BLAS -- A library with LAPACK API not found. Please specify library location. -- Found TBB: /usr/lib/x86_64-linux-gnu/libtbb.so -- found IPP (ICV version): 9.0.1 [9.0.1] -- at: /home/user/bin/opencv/build/3rdparty/ippicv/ippicv_lnx -- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) -- Could NOT find Matlab (missing: MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN) -- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file -- Caffe: NO -- Protobuf: YES -- Glog: NO -- freetype2: YES -- harfbuzz: YES -- Could NOT find HDF5 (missing: HDF5_LIBRARIES HDF5_INCLUDE_DIRS) -- Module opencv_sfm disabled because the following dependencies are not found: Eigen Glog/Gflags -- freetype2: YES -- harfbuzz: YES -- Checking for modules 'tesseract;lept' -- No package 'tesseract' found -- No package 'lept' found -- Tesseract: NO -- Check contents of vgg_generated_48.i ... -- Check contents of vgg_generated_64.i ... -- Check contents of vgg_generated_80.i ... -- Check contents of vgg_generated_120.i ... -- Check contents of boostdesc_bgm.i ... -- Check contents of boostdesc_bgm_bi.i ... -- Check contents of boostdesc_bgm_hd.i ... -- Check contents of boostdesc_binboost_064.i ... -- Check contents of boostdesc_binboost_128.i ... -- Check contents of boostdesc_binboost_256.i ... -- Check contents of boostdesc_lbgm.i ... -- -- General configuration for OpenCV 3.2.0-rc ===================================== -- Version control: 3.2.0-rc -- -- Extra modules: -- Location (extra): /home/user/bin/opencv_contrib/modules -- Version control (extra): 3.2.0-rc -- -- Platform: -- Timestamp: 2017-03-16T16:40:39Z -- Host: Linux 4.8.0-40-generic x86_64 ... (more)
2017-03-15 16:42:05 -0600	received badge	● Scholar (source)
2017-03-15 16:41:59 -0600	answered a question	Linking error when building OpenCV 3.2.0 with Python support Is not entirely a solution for the `3.2.0` tag, but by changing the branch to `3.2.0-rc` it was solved. Probably there are some extra configuration on the normal branch that is not straightforward to get.
2017-03-08 13:53:32 -0600	commented question	Linking error when building OpenCV 3.2.0 with Python support Is this related to this other problem http://stackoverflow.com/questions/11643666/python-importerror-undefined-symbol-for-custom-c-module (http://stackoverflow.com/questions/11...) Maybe the order in the `Makefile` that links the libraries?
2017-03-08 13:17:22 -0600	received badge	● Editor (source)
2017-03-08 06:49:27 -0600	asked a question	Linking error when building OpenCV 3.2.0 with Python support I build OpenCV 3.2.0 from the sources (including the contrib modules) using the `3.2.0` branch. And when I import it within python, through `import cv2`, I get an `undefined symbol` error. That in my experience seems like a linking error. $ python Python 2.7.12+ (default, Sep 17 2016, 12:08:02) [GCC 6.2.0 20160914] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: /usr/local/lib/python2.7/dist-packages/cv2.so: undefined symbol: _Z13pyopencv_fromIN2cv4MatxIdLi4ELi4EEEEP7_objectRKT_ >>> $ python3 Python 3.5.2+ (default, Sep 22 2016, 12:18:14) [GCC 6.2.0 20160927] on linux Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: /usr/local/lib/python3.5/dist-packages/cv2.cpython-35m-x86_64-linux-gnu.so: undefined symbol: _Z13pyopencv_fromIN2cv4MatxIdLi4ELi4EEEEP7_objectRKT_ >>> My `gcc` `$ gcc --version gcc (Ubuntu 6.2.0-5ubuntu12) 6.2.0 20161005 Copyright (C) 2016 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.` My flags in `cmake` are as follows: `cmake \ -D CMAKE_BUILD_TYPE=RELEASE \ -D ENABLE_PRECOMPILED_HEADERS=OFF \ -D CMAKE_INSTALL_PREFIX=/usr/local \ -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules \ -D BUILD_NEW_PYTHON_SUPPORT=ON \ -D WITH_TBB=ON \ -D WITH_QT=ON \ -D WITH_OPENGL=ON \ -D BUILD_TIFF=ON \ -D BUILD_SHARED_LIBS=OFF \ -D BUILD_EXAMPLES=ON \ ..` I see in other posts that the problem my be due to the sharing libraries, and so I tried with `-D BUILD_SHARED_LIBS=OFF` but that doesn't work either. My system is `$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.10 Release: 16.10 Codename: yakkety` Let me know if you need more information. Any help is appreciated.

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CMake Output