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cmake for compiling OpenCV on Jetson Nano Orin
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# cmake_rb2 | |
# https://stackoverflow.com/questions/67694539/opencv-config-with-two-major-python-3-7-3-8 | |
# https://stackoverflow.com/questions/67694539/opencv-config-with-two-major-python-3-7-3-8 | |
# cd :~/opencv/build/python_loader | |
# pip wheel . --verbose | |
#-D CMAKE_INSTALL_PREFIX=/usr \ | |
cmake -D CMAKE_BUILD_TYPE=RELEASE \ | |
-D CMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") \ | |
-D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \ | |
-D EIGEN_INCLUDE_PATH=/usr/include/eigen3 \ | |
-D WITH_OPENCL=OFF \ | |
-D WITH_CUDA=ON \ | |
-D CUDA_ARCH_BIN=5.3 \ | |
-D CUDA_ARCH_PTX="" \ | |
-D WITH_CUDNN=ON \ | |
-D WITH_CUBLAS=ON \ | |
-D ENABLE_FAST_MATH=ON \ | |
-D CUDA_FAST_MATH=ON \ | |
-D OPENCV_DNN_CUDA=ON \ | |
-D ENABLE_NEON=ON \ | |
-D WITH_QT=ON \ | |
-D WITH_OPENMP=ON \ | |
-D BUILD_TIFF=ON \ | |
-D WITH_FFMPEG=ON \ | |
-D WITH_GSTREAMER=ON \ | |
-D WITH_TBB=ON \ | |
-D BUILD_TBB=ON \ | |
-D BUILD_TESTS=OFF \ | |
-D WITH_EIGEN=ON \ | |
-D WITH_V4L=ON \ | |
-D WITH_LIBV4L=ON \ | |
-D WITH_PROTOBUF=ON \ | |
-D OPENCV_ENABLE_NONFREE=ON \ | |
-D INSTALL_C_EXAMPLES=OFF \ | |
-D INSTALL_PYTHON_EXAMPLES=ON \ | |
-D PYTHON3_PACKAGES_PATH=/usr/lib/python3/dist-packages \ | |
-D OPENCV_PYTHON3_INSTALL_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \ | |
-D OPENCV_GENERATE_PKGCONFIG=ON \ | |
-D BUILD_opencv_python3=ON \ | |
-D ENABLE_CONTRIB=1 \ | |
-D ENABLE_HEADLESS=1 \ | |
-D BUILD_EXAMPLES=ON .. | |
(donkey) rainer@ubuntu:~/opencv/build$ cmake -D CMAKE_BUILD_TYPE=RELEASE \ | |
> -D CMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") \ | |
> -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib/modules \ | |
> -D EIGEN_INCLUDE_PATH=/usr/include/eigen3 \ | |
> -D WITH_OPENCL=OFF \ | |
> -D WITH_CUDA=ON \ | |
> -D CUDA_ARCH_BIN=5.3 \ | |
> -D CUDA_ARCH_PTX="" \ | |
> -D WITH_CUDNN=ON \ | |
> -D WITH_CUBLAS=ON \ | |
> -D ENABLE_FAST_MATH=ON \ | |
> -D CUDA_FAST_MATH=ON \ | |
> -D OPENCV_DNN_CUDA=ON \ | |
> -D ENABLE_NEON=ON \ | |
> -D WITH_QT=ON \ | |
> -D WITH_OPENMP=ON \ | |
> -D BUILD_TIFF=ON \ | |
> -D WITH_FFMPEG=ON \ | |
> -D WITH_GSTREAMER=ON \ | |
> -D WITH_TBB=ON \ | |
> -D BUILD_TBB=ON \ | |
> -D BUILD_TESTS=OFF \ | |
> -D WITH_EIGEN=ON \ | |
> -D WITH_V4L=ON \ | |
> -D WITH_LIBV4L=ON \ | |
> -D WITH_PROTOBUF=ON \ | |
> -D OPENCV_ENABLE_NONFREE=ON \ | |
> -D INSTALL_C_EXAMPLES=OFF \ | |
> -D INSTALL_PYTHON_EXAMPLES=ON \ | |
> -D PYTHON3_PACKAGES_PATH=/usr/lib/python3/dist-packages \ | |
> -D OPENCV_PYTHON3_INSTALL_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \ | |
> -D OPENCV_GENERATE_PKGCONFIG=ON \ | |
> -D BUILD_opencv_python3=ON \ | |
> -D ENABLE_CONTRIB=1 \ | |
> -D ENABLE_HEADLESS=1 \ | |
> -D BUILD_EXAMPLES=ON .. | |
-- Detected processor: aarch64 | |
Python 2.7.18 | |
-- Looking for ccache - not found | |
-- Found ZLIB: /usr/lib/aarch64-linux-gnu/libz.so (found suitable version "1.2.11", minimum required is "1.2.3") | |
Cleaning INTERNAL cached variable: WEBP_LIBRARY | |
Cleaning INTERNAL cached variable: WEBP_INCLUDE_DIR | |
-- Found WebP: /home/rainer/miniconda3/envs/donkey/lib/libwebp.so | |
-- Could NOT find OpenJPEG (minimal suitable version: 2.0, recommended version >= 2.3.1). OpenJPEG will be built from sources | |
-- OpenJPEG: VERSION = 2.5.0, BUILD = opencv-4.8.0-dev-openjp2-2.5.0 | |
-- OpenJPEG libraries will be built from sources: libopenjp2 (version "2.5.0") | |
-- Found ZLIB: /usr/lib/aarch64-linux-gnu/libz.so (found version "1.2.11") | |
-- Found OpenEXR: /usr/lib/aarch64-linux-gnu/libIlmImf.so | |
CMake Warning (dev) at /usr/share/cmake-3.16/Modules/FindOpenGL.cmake:275 (message): | |
Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when | |
available. Run "cmake --help-policy CMP0072" for policy details. Use the | |
cmake_policy command to set the policy and suppress this warning. | |
FindOpenGL found both a legacy GL library: | |
OPENGL_gl_LIBRARY: /usr/lib/aarch64-linux-gnu/libGL.so | |
and GLVND libraries for OpenGL and GLX: | |
OPENGL_opengl_LIBRARY: /usr/lib/aarch64-linux-gnu/libOpenGL.so | |
OPENGL_glx_LIBRARY: /usr/lib/aarch64-linux-gnu/libGLX.so | |
OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for | |
compatibility with CMake 3.10 and below the legacy GL library will be used. | |
Call Stack (most recent call first): | |
cmake/OpenCVFindLibsGUI.cmake:66 (find_package) | |
CMakeLists.txt:755 (include) | |
This warning is for project developers. Use -Wno-dev to suppress it. | |
-- CUDA detected: 11.4 | |
-- CUDA: Using CUDA_ARCH_BIN=5.3 | |
-- CUDA NVCC target flags: -gencode;arch=compute_53,code=sm_53;-D_FORCE_INLINES | |
-- LAPACK(Atlas): LAPACK_LIBRARIES: /usr/lib/aarch64-linux-gnu/liblapack.so;/usr/lib/aarch64-linux-gnu/libcblas.so;/usr/lib/aarch64-linux-gnu/libatlas.so | |
-- LAPACK(Atlas): Support is enabled. | |
-- Could NOT find Java (missing: Java_JAVA_EXECUTABLE Java_JAR_EXECUTABLE Java_JAVAC_EXECUTABLE Java_JAVAH_EXECUTABLE Java_JAVADOC_EXECUTABLE) | |
-- Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH) | |
-- Could NOT find Flake8 (missing: FLAKE8_EXECUTABLE) | |
-- VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file | |
-- Checking for module 'gtkglext-1.0' | |
-- No package 'gtkglext-1.0' found | |
-- freetype2: YES (ver 23.1.17) | |
-- harfbuzz: YES (ver 2.6.4) | |
-- HDF5: Using hdf5 compiler wrapper to determine C configuration | |
-- Julia not found. Not compiling Julia Bindings. | |
-- Module opencv_ovis disabled because OGRE3D was not found | |
-- CERES support is disabled. Ceres Solver for reconstruction API is required. | |
-- Tesseract: YES (ver 4.1.1) | |
-- Allocator metrics storage type: 'int' | |
-- HDF5: Using hdf5 compiler wrapper to determine C configuration | |
-- Excluding from source files list: modules/imgproc/src/corner.avx.cpp | |
-- Excluding from source files list: modules/imgproc/src/imgwarp.avx2.cpp | |
-- Excluding from source files list: modules/imgproc/src/imgwarp.lasx.cpp | |
-- Excluding from source files list: modules/imgproc/src/imgwarp.sse4_1.cpp | |
-- Excluding from source files list: modules/imgproc/src/resize.avx2.cpp | |
-- Excluding from source files list: modules/imgproc/src/resize.lasx.cpp | |
-- Excluding from source files list: modules/imgproc/src/resize.sse4_1.cpp | |
-- Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': /home/rainer/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake | |
-- opencv_dnn: filter out ocl4dnn source code | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx2.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.avx512_skx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.rvv.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.lasx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.avx2.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.avx512_skx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.lasx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_block.avx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_block.avx2.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.avx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.avx2.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.rvv.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_depthwise.lasx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_winograd_f63.avx.cpp | |
-- Excluding from source files list: <BUILD>/modules/dnn/layers/cpu_kernels/conv_winograd_f63.avx2.cpp | |
-- Excluding from source files list: modules/features2d/src/fast.avx2.cpp | |
-- highgui: using builtin backend: QT5 | |
-- CERES support is disabled. Ceres Solver for reconstruction API is required. | |
-- Building with NVIDIA Optical Flow API 2.0 | |
-- Found 'misc' Python modules from /home/rainer/opencv/modules/python/package/extra_modules | |
-- Found 'mat_wrapper;utils' Python modules from /home/rainer/opencv/modules/core/misc/python/package | |
-- Found 'gapi' Python modules from /home/rainer/opencv/modules/gapi/misc/python/package | |
-- Found 'misc' Python modules from /home/rainer/opencv/modules/python/package/extra_modules | |
-- Found 'mat_wrapper;utils' Python modules from /home/rainer/opencv/modules/core/misc/python/package | |
-- Found 'gapi' Python modules from /home/rainer/opencv/modules/gapi/misc/python/package | |
-- OpenCL samples are skipped: OpenCL SDK is required | |
-- SYCL/OpenCL samples are skipped: SYCL SDK is required | |
-- - check configuration of SYCL_DIR/SYCL_ROOT/CMAKE_MODULE_PATH | |
-- - ensure that right compiler is selected from SYCL SDK (e.g, clang++): CMAKE_CXX_COMPILER=/usr/bin/c++ | |
-- Registered 'check_pylint' target: using /home/rainer/miniconda3/envs/donkey/bin/pylint (ver: 2.16.2), checks: 192 | |
-- | |
-- General configuration for OpenCV 4.8.0-dev ===================================== | |
-- Version control: 1a8d37d | |
-- | |
-- Extra modules: | |
-- Location (extra): /home/rainer/opencv_contrib/modules | |
-- Version control (extra): 9e13469 | |
-- | |
-- Platform: | |
-- Timestamp: 2023-09-08T20:05:04Z | |
-- Host: Linux 5.10.120-tegra aarch64 | |
-- CMake: 3.16.3 | |
-- CMake generator: Unix Makefiles | |
-- CMake build tool: /usr/bin/make | |
-- Configuration: RELEASE | |
-- | |
-- CPU/HW features: | |
-- Baseline: NEON FP16 | |
-- required: NEON | |
-- | |
-- C/C++: | |
-- Built as dynamic libs?: YES | |
-- C++ standard: 11 | |
-- C++ Compiler: /usr/bin/c++ (ver 9.4.0) | |
-- C++ flags (Release): -fsigned-char -ffast-math -fno-finite-math-only -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -fopenmp -O3 -DNDEBUG -DNDEBUG | |
-- C++ flags (Debug): -fsigned-char -ffast-math -fno-finite-math-only -W -Wall -Wreturn-type -Wnon-virtual-dtor -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fvisibility-inlines-hidden -fopenmp -g -O0 -DDEBUG -D_DEBUG | |
-- C Compiler: /usr/bin/cc | |
-- C flags (Release): -fsigned-char -ffast-math -fno-finite-math-only -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fopenmp -O3 -DNDEBUG -DNDEBUG | |
-- C flags (Debug): -fsigned-char -ffast-math -fno-finite-math-only -W -Wall -Wreturn-type -Waddress -Wsequence-point -Wformat -Wformat-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -fvisibility=hidden -fopenmp -g -O0 -DDEBUG -D_DEBUG | |
-- Linker flags (Release): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined | |
-- Linker flags (Debug): -Wl,--gc-sections -Wl,--as-needed -Wl,--no-undefined | |
-- ccache: NO | |
-- Precompiled headers: NO | |
-- Extra dependencies: m pthread cudart_static dl rt nppc nppial nppicc nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/usr/local/cuda-11.4/lib64 -L/usr/lib/aarch64-linux-gnu | |
-- 3rdparty dependencies: | |
-- | |
-- OpenCV modules: | |
-- To be built: alphamat aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev cvv datasets dnn dnn_objdetect dnn_superres dpm face features2d flann freetype fuzzy gapi hdf hfs highgui img_hash imgcodecs imgproc intensity_transform line_descriptor mcc ml objdetect optflow phase_unwrapping photo plot python2 quality rapid reg rgbd saliency sfm shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab wechat_qrcode xfeatures2d ximgproc xobjdetect xphoto | |
-- Disabled: cudacodec world | |
-- Disabled by dependency: - | |
-- Unavailable: java julia matlab ovis python3 viz | |
-- Applications: perf_tests examples apps | |
-- Documentation: NO | |
-- Non-free algorithms: YES | |
-- | |
-- GUI: QT5 | |
-- QT: YES (ver 5.12.8 ) | |
-- QT OpenGL support: YES (Qt5::OpenGL 5.12.8) | |
-- GTK+: YES (ver 3.24.20) | |
-- GThread : YES (ver 2.64.6) | |
-- GtkGlExt: NO | |
-- OpenGL support: YES (/usr/lib/aarch64-linux-gnu/libGL.so /usr/lib/aarch64-linux-gnu/libGLU.so) | |
-- VTK support: NO | |
-- | |
-- Media I/O: | |
-- ZLib: /usr/lib/aarch64-linux-gnu/libz.so (ver 1.2.11) | |
-- JPEG: /usr/lib/aarch64-linux-gnu/libjpeg.so (ver 80) | |
-- WEBP: /home/rainer/miniconda3/envs/donkey/lib/libwebp.so (ver encoder: 0x020f) | |
-- PNG: /usr/lib/aarch64-linux-gnu/libpng.so (ver 1.6.37) | |
-- TIFF: build (ver 42 - 4.2.0) | |
-- JPEG 2000: build (ver 2.5.0) | |
-- OpenEXR: /usr/lib/aarch64-linux-gnu/libImath.so /usr/lib/aarch64-linux-gnu/libIlmImf.so /usr/lib/aarch64-linux-gnu/libIex.so /usr/lib/aarch64-linux-gnu/libHalf.so /usr/lib/aarch64-linux-gnu/libIlmThread.so (ver 2_3) | |
-- HDR: YES | |
-- SUNRASTER: YES | |
-- PXM: YES | |
-- PFM: YES | |
-- | |
-- Video I/O: | |
-- DC1394: YES (2.2.5) | |
-- FFMPEG: YES | |
-- avcodec: YES (58.54.100) | |
-- avformat: YES (58.29.100) | |
-- avutil: YES (56.31.100) | |
-- swscale: YES (5.5.100) | |
-- avresample: YES (4.0.0) | |
-- GStreamer: YES (1.16.3) | |
-- v4l/v4l2: YES (linux/videodev2.h) | |
-- | |
-- Parallel framework: TBB (ver 2020.2 interface 11102) | |
-- | |
-- Trace: YES (with Intel ITT) | |
-- | |
-- Other third-party libraries: | |
-- Lapack: YES (/usr/lib/aarch64-linux-gnu/liblapack.so /usr/lib/aarch64-linux-gnu/libcblas.so /usr/lib/aarch64-linux-gnu/libatlas.so) | |
-- Default DNN backend: DNN_BACKEND_OPENCV | |
-- Eigen: YES (ver 3.3.7) | |
-- Custom HAL: YES (carotene (ver 0.0.1)) | |
-- Protobuf: build (3.19.1) | |
-- Flatbuffers: builtin/3rdparty (23.5.9) | |
-- | |
-- NVIDIA CUDA: YES (ver 11.4, CUFFT CUBLAS FAST_MATH) | |
-- NVIDIA GPU arch: 53 | |
-- NVIDIA PTX archs: | |
-- | |
-- cuDNN: YES (ver 8.6.0) | |
-- | |
-- Python 2: | |
-- Interpreter: /usr/bin/python2.7 (ver 2.7.18) | |
-- Libraries: /usr/lib/aarch64-linux-gnu/libpython2.7.so (ver 2.7.18) | |
-- numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.16.5) | |
-- install path: lib/python2.7/dist-packages/cv2/python-2.7 | |
-- | |
-- Python 3: | |
-- Interpreter: /home/rainer/miniconda3/envs/donkey/bin/python3 (ver 3.8.17) | |
-- Libraries: NO | |
-- numpy: /home/rainer/miniconda3/envs/donkey/lib/python3.8/site-packages/numpy/core/include (ver 1.24.3) | |
-- install path: - | |
-- | |
-- Python (for build): /usr/bin/python2.7 | |
-- | |
-- Java: | |
-- ant: NO | |
-- Java: NO | |
-- JNI: NO | |
-- Java wrappers: NO | |
-- Java tests: NO | |
-- | |
-- Install to: /home/rainer/miniconda3/envs/donkey | |
-- ----------------------------------------------------------------- | |
-- | |
-- Configuring done | |
CMake Warning at cmake/OpenCVUtils.cmake:1560 (add_library): | |
Cannot generate a safe runtime search path for target opencv_imgcodecs | |
because files in some directories may conflict with libraries in implicit | |
directories: | |
runtime library [libpng16.so.16] in /usr/lib/aarch64-linux-gnu may be hidden by files in: | |
/home/rainer/miniconda3/envs/donkey/lib | |
runtime library [libz.so.1] in /usr/lib/aarch64-linux-gnu may be hidden by files in: | |
/home/rainer/miniconda3/envs/donkey/lib | |
Some of these libraries may not be found correctly. | |
Call Stack (most recent call first): | |
cmake/OpenCVModule.cmake:989 (ocv_add_library) | |
cmake/OpenCVModule.cmake:905 (_ocv_create_module) | |
modules/imgcodecs/CMakeLists.txt:168 (ocv_create_module) | |
-- Generating done | |
-- Build files have been written to: /home/rainer/opencv/build | |
# stackoverflow https://stackoverflow.com/questions/70334087/how-to-build-opencv-from-source-with-python-binding | |
cmake \ | |
-D CMAKE_BUILD_TYPE=RELEASE \ | |
-D CMAKE_INSTALL_PREFIX=$(python3 -c "import sys; print(sys.prefix)") \ | |
-D INSTALL_PYTHON_EXAMPLES=ON \ | |
-D INSTALL_C_EXAMPLES=ON \ | |
-D WITH_TBB=ON \ | |
-D WITH_CUDA=ON \ | |
-D BUILD_opencv_cudacodec=OFF \ | |
-D ENABLE_FAST_MATH=1 \ | |
-D CUDA_FAST_MATH=1 \ | |
-D WITH_CUBLAS=1 \ | |
-D WITH_V4L=ON \ | |
-D WITH_QT=ON \ | |
-D WITH_OPENGL=ON \ | |
-D WITH_GSTREAMER=ON \ | |
-D OPENCV_GENERATE_PKGCONFIG=ON \ | |
-D OPENCV_PC_FILE_NAME=opencv.pc \ | |
-D OPENCV_ENABLE_NONFREE=ON \ | |
-D OPENCV_PYTHON3_INSTALL_PATH=$(python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \ | |
-D OPENCV_EXTRA_MODULES_PATH=/tmp/opencv_contrib/modules \ | |
-D PYTHON_EXECUTABLE=$(which python3) \ | |
-D BUILD_EXAMPLES=ON .. |
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