I am trying to install latest OpenCV from here: https://github.com/opencv/opencv on my Ubuntu 20.04.
I need python and java support. I have installed a lot of per-requisites and used this cmake command to configure the build using the command line:
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$ cmake -DBUILD_SHARED_LIBS=OFF -DOPENCV_EXTRA_MODULES_PATH=/home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/opencv_contrib/modules -DUSE_AVX_INSTRUCTIONS=ON -DUSE_SSE4_INSTRUCTIONS=ON -DWITH_QT=ON -DWITH_OPENGL=ON -DOpenGL_GL_PREFERENCE=GLVND -DWITH_CUDA=ON -DBUILD_opencv_world=ON -DWITH_TESSERACT=ON -DWITH_LAPACK=ON -DLAPACKE_INCLUDE_DIR=/home/plamen/Install/OpenCV_install_info/lapack-3.9.0/LAPACKE/include -DLAPACK_CBLAS_H=/home/plamen/Install/OpenCV_install_info/lapack-3.9.0/CBLAS/include/cblas.h -DLAPACK_LAPACKE_H=/home/plamen/Install/OpenCV_install_info/lapack-3.9.0/LAPACKE/include/lapacke.h -DWITH_GSTREAMER=ON -DWITH_EIGEN=ON -DWITH_GTK=ON -DWITH_JASPER=ON -DWITH_FFMPEG=ON -DBUILD_EXAMPLES=ON -DINSTALL_C_EXAMPLES=ON -DNSTALL_PYTHON_EXAMPLES=ON -DOPENCV_ENABLE_NONFREE=ON -DINSTALL_TESTS=ON -DINSTALL_PYTHON_SAMPLES=ON -DINSTALL_C_SAMPLES=ON -DOPENCV_FORCE_3RDPARTY_BUILD=ON -DPYTHON2_EXECUTABLE=/usr/bin/python2.7 -DPYTHON2_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7.so -DPYTHON2_INCLUDE_DIR=/usr/include/python2.7 -DPYTHON2_NUMPY_INCLUDE_DIR=/usr/include/python2.7/numpy -DPYTHON2_PACKAGES_PATH=/usr/lib/python2.7/dist-packages -DPYTHON3_EXECUTABLE=/usr/bin/python3 -DPYTHON3_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.8.so -DPYTHON3_INCLUDE_DIR=/usr/include/python3.8 -DPYTHON3_NUMPY_INCLUDE_DIR=/usr/include/python3.8/numpy -DPYTHON3_PACKAGES_PATH=/usr/lib/python3/dist-packages -DOPENCV_FORCE_PYTHON_LIBS=ON -DPYTHON_DEFAULT_EXECUTABLE=$(which python3) -DBUILD_NEW_PYTHON_SUPPORT=ON -DBUILD_opencv_python3=ON -DHAVE_opencv_python3=ON -DBUILD_JAVA=ON -DBUILD_opencv_java=ON -DBUILD_opencv_java_bindings_generator=ON -DBUILD_opencv_java_bindings_gen=ON -DJAVA_AWT_INCLUDE_PATH=/usr/lib/jvm/jdk-14.0.1/include -DJAVA_AWT_LIBRARY=/usr/lib/jvm/jdk-14.0.1/lib/libjawt.so -DJAVA_INCLUDE_PATH=/usr/lib/jvm/jdk-14.0.1/include -DJAVA_INCLUDE_PATH2=/usr/lib/jvm/jdk-14.0.1/include/linux -DJAVA_JVM_LIBRARY=/usr/lib/jvm/jdk-14.0.1/lib/server/libjvm.so -DBUILD_TESTS=ON -DBUILD_opencv_imgproc=ON -DBUILD_opencv_imgcodecs=ON -DBUILD_opencv_core=ON -DOPENCV_GENERATE_PKGCONFIG=ON ..The output was this:
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-- -- General configuration for OpenCV 4.4.0-pre =====================================-- Version control: 4.3.0-529-ga5fdcf9881-- -- Extra modules:-- Location (extra): /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/opencv_contrib/modules-- Version control (extra): 4.3.0-77-g52200a82-- -- Platform:-- Timestamp: 2020-07-05T17:57:08Z-- Host: Linux 5.4.0-40-generic x86_64-- CMake: 3.16.3-- CMake generator: Unix Makefiles-- CMake build tool: /usr/bin/make-- Configuration: Release-- -- CPU/HW features:-- Baseline: SSE SSE2 SSE3-- requested: SSE3-- Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX-- requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX-- SSE4_1 (17 files): + SSSE3 SSE4_1-- SSE4_2 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2-- FP16 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX-- AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX-- AVX2 (31 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2-- AVX512_SKX (7 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX-- -- C/C++:-- Built as dynamic libs?: NO-- C++ standard: 11-- C++ Compiler: /usr/bin/c++ (ver 9.3.0)-- C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG-- C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG-- C Compiler: /usr/bin/cc-- C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG-- C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG-- Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -- Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -- ccache: NO-- Precompiled headers: NO-- Extra dependencies: Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Test Qt5::Concurrent Qt5::OpenGL /usr/lib/x86_64-linux-gnu/hdf5/serial/libhdf5.so /usr/lib/x86_64-linux-gnu/libpthread.so /usr/lib/x86_64-linux-gnu/libsz.so /usr/lib/x86_64-linux-gnu/libz.so /usr/lib/x86_64-linux-gnu/libdl.so /usr/lib/x86_64-linux-gnu/libm.so /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib/x86_64-linux-gnu/libharfbuzz.so ade correspondence multiview numeric /usr/lib/x86_64-linux-gnu/libglog.so gflags_shared m pthread /usr/lib/x86_64-linux-gnu/libOpenGL.so /usr/lib/x86_64-linux-gnu/libGLX.so /usr/lib/x86_64-linux-gnu/libGLU.so cudart_static -lpthread dl rt nppc nppial nppicc nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/usr/local/cuda/lib64 -L/usr/lib/x86_64-linux-gnu-- 3rdparty dependencies: libprotobuf libjpeg-turbo libwebp libpng libtiff libjasper IlmImf zlib ittnotify quirc ippiw ippicv-- -- OpenCV modules:-- To be built: alphamat aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec 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 ml objdetect optflow phase_unwrapping photo plot python2 python3 quality rapid reg rgbd saliency sfm shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab world xfeatures2d ximgproc xobjdetect xphoto-- Disabled: --- Disabled by dependency: --- Unavailable: cnn_3dobj java js julia matlab ovis python2 viz-- Applications: tests perf_tests examples apps-- Documentation: NO-- Non-free algorithms: YES-- -- GUI: -- QT: YES (ver 5.12.8)-- QT OpenGL support: YES (Qt5::OpenGL 5.12.8)-- GTK+: NO-- OpenGL support: YES (/usr/lib/x86_64-linux-gnu/libOpenGL.so /usr/lib/x86_64-linux-gnu/libGLX.so /usr/lib/x86_64-linux-gnu/libGLU.so)-- VTK support: NO-- -- Media I/O: -- ZLib: build (ver 1.2.11)-- JPEG: build-libjpeg-turbo (ver 2.0.5-62)-- WEBP: build (ver encoder: 0x020f)-- PNG: build (ver 1.6.37)-- TIFF: build (ver 42 - 4.0.10)-- JPEG 2000: build Jasper (ver 1.900.1)-- OpenEXR: build (ver 2.3.0)-- HDR: YES-- SUNRASTER: YES-- PXM: YES-- PFM: YES-- -- Video I/O:-- DC1394: NO-- FFMPEG: YES-- avcodec: YES (58.54.100)-- avformat: YES (58.29.100)-- avutil: YES (56.31.100)-- swscale: YES (5.5.100)-- avresample: NO-- GStreamer: YES (1.16.2)-- v4l/v4l2: YES (linux/videodev2.h)-- -- Parallel framework: pthreads-- -- Trace: YES (with Intel ITT)-- -- Other third-party libraries:-- Intel IPP: 2020.0.0 Gold [2020.0.0]-- at: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/3rdparty/ippicv/ippicv_lnx/icv-- Intel IPP IW: sources (2020.0.0)-- at: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/3rdparty/ippicv/ippicv_lnx/iw-- Lapack: NO-- Eigen: YES (ver 3.3.7)-- Custom HAL: NO-- Protobuf: build (3.5.1)-- -- NVIDIA CUDA: YES (ver 11.0, CUFFT CUBLAS)-- NVIDIA GPU arch: 30 35 37 50 52 60 61 70 75 80-- NVIDIA PTX archs:-- -- cuDNN: YES (ver 8.0.1)-- -- OpenCL: YES (no extra features)-- Include path: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/3rdparty/include/opencl/1.2-- Link libraries: Dynamic load-- -- Python 2:-- Interpreter: /usr/bin/python2.7 (ver 2.7.18)-- Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.18rc1)-- numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.16.5)-- install path: /usr/lib/python2.7/dist-packages/cv2/python-2.7-- -- Python 3:-- Interpreter: /usr/bin/python3 (ver 3.8.2)-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.8.so (ver 3.8.2)-- numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.17.4)-- install path: /usr/lib/python3/dist-packages/cv2/python-3.8-- -- Python (for build): /usr/bin/python3-- -- Java: -- ant: /snap/bin/ant (ver 1.10.8)-- JNI: /usr/lib/jvm/jdk-14.0.1/include /usr/lib/jvm/jdk-14.0.1/include/linux /usr/lib/jvm/jdk-14.0.1/include-- Java wrappers: NO-- Java tests: NO-- -- Install to: /usr/local-- ------------------------------------------------------------------- -- Configuring done-- Generating done-- Build files have been written to: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/buildI see that cmake finds my python 2 and python 3 versions, finds also my java JNI and ant, but I see that the java module is listed in the unavailable modules list:
Unavailable: cnn_3dobj java js julia matlab ovis python2 viz
I see also that Java Wrappers and Java tests are marked with NO: — Java wrappers: NO — Java tests: NO
Please advise what am I doing wrong and how to make cmake build my java module, and find java wrappers and build java tests?
Thank you in advance for your help!
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Answer
Meanwhile I found the reason. The problem was this option: -DBUILD_opencv_world=ON When I removed it:
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$ cmake -DBUILD_SHARED_LIBS=OFF -DOPENCV_EXTRA_MODULES_PATH=/home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/opencv_contrib/modules -DUSE_AVX_INSTRUCTIONS=ON -DUSE_SSE4_INSTRUCTIONS=ON -DWITH_QT=ON -DWITH_OPENGL=ON -DOpenGL_GL_PREFERENCE=GLVND -DWITH_CUDA=ON -DWITH_TESSERACT=ON -DWITH_LAPACK=ON -DLAPACKE_INCLUDE_DIR=/home/plamen/Install/OpenCV_install_info/lapack-3.9.0/LAPACKE/include -DLAPACK_CBLAS_H=/home/plamen/Install/OpenCV_install_info/lapack-3.9.0/CBLAS/include/cblas.h -DLAPACK_LAPACKE_H=/home/plamen/Install/OpenCV_install_info/lapack-3.9.0/LAPACKE/include/lapacke.h -DWITH_GSTREAMER=ON -DWITH_EIGEN=ON -DWITH_GTK=ON -DWITH_JASPER=ON -DWITH_FFMPEG=ON -DBUILD_EXAMPLES=ON -DINSTALL_C_EXAMPLES=ON -DINSTALL_PYTHON_EXAMPLES=ON -DOPENCV_ENABLE_NONFREE=ON -DINSTALL_TESTS=ON -DINSTALL_PYTHON_SAMPLES=ON -DINSTALL_C_SAMPLES=ON -DOPENCV_FORCE_3RDPARTY_BUILD=ON -DPYTHON2_EXECUTABLE=/usr/bin/python2.7 -DPYTHON2_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython2.7.so -DPYTHON2_INCLUDE_DIR=/usr/include/python2.7 -DPYTHON2_NUMPY_INCLUDE_DIR=/usr/include/python2.7/numpy -DPYTHON2_PACKAGES_PATH=/usr/lib/python2.7/dist-packages -DPYTHON3_EXECUTABLE=/usr/bin/python3 -DPYTHON3_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.8.so -DPYTHON3_INCLUDE_DIR=/usr/include/python3.8 -DPYTHON3_NUMPY_INCLUDE_DIR=/usr/include/python3.8/numpy -DPYTHON3_PACKAGES_PATH=/usr/lib/python3/dist-packages -DOPENCV_FORCE_PYTHON_LIBS=ON -DPYTHON_DEFAULT_EXECUTABLE=$(which python3) -DBUILD_NEW_PYTHON_SUPPORT=ON -DBUILD_opencv_python3=ON -DHAVE_opencv_python3=ON -DBUILD_JAVA=ON -DBUILD_opencv_java=ON -DBUILD_opencv_java_bindings_generator=ON -DBUILD_opencv_java_bindings_gen=ON -DJAVA_AWT_INCLUDE_PATH=/usr/lib/jvm/jdk-14.0.1/include -DJAVA_AWT_LIBRARY=/usr/lib/jvm/jdk-14.0.1/lib/libjawt.so -DJAVA_INCLUDE_PATH=/usr/lib/jvm/jdk-14.0.1/include -DJAVA_INCLUDE_PATH2=/usr/lib/jvm/jdk-14.0.1/include/linux -DJAVA_JVM_LIBRARY=/usr/lib/jvm/jdk-14.0.1/lib/server/libjvm.so -DBUILD_TESTS=ON -DBUILD_opencv_imgproc=ON -DBUILD_opencv_imgcodecs=ON -DBUILD_opencv_core=ON -DOPENCV_GENERATE_PKGCONFIG=ON .. java was found successfuly and I got this nice output:
JavaScript
-- -- General configuration for OpenCV 4.4.0-pre =====================================-- Version control: 4.3.0-529-ga5fdcf9881-- -- Extra modules:-- Location (extra): /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/opencv_contrib/modules-- Version control (extra): 4.3.0-77-g52200a82-- -- Platform:-- Timestamp: 2020-07-06T18:51:57Z-- Host: Linux 5.4.0-40-generic x86_64-- CMake: 3.16.3-- CMake generator: Unix Makefiles-- CMake build tool: /usr/bin/make-- Configuration: Release-- -- CPU/HW features:-- Baseline: SSE SSE2 SSE3-- requested: SSE3-- Dispatched code generation: SSE4_1 SSE4_2 FP16 AVX AVX2 AVX512_SKX-- requested: SSE4_1 SSE4_2 AVX FP16 AVX2 AVX512_SKX-- SSE4_1 (17 files): + SSSE3 SSE4_1-- SSE4_2 (2 files): + SSSE3 SSE4_1 POPCNT SSE4_2-- FP16 (1 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX-- AVX (5 files): + SSSE3 SSE4_1 POPCNT SSE4_2 AVX-- AVX2 (31 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2-- AVX512_SKX (7 files): + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2 AVX_512F AVX512_COMMON AVX512_SKX-- -- C/C++:-- Built as dynamic libs?: NO-- C++ standard: 11-- C++ Compiler: /usr/bin/c++ (ver 9.3.0)-- C++ flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG -DNDEBUG-- C++ flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wsuggest-override -Wno-delete-non-virtual-dtor -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g -O0 -DDEBUG -D_DEBUG-- C Compiler: /usr/bin/cc-- C flags (Release): -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG -DNDEBUG-- C flags (Debug): -fsigned-char -W -Wall -Werror=return-type -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-comment -Wimplicit-fallthrough=3 -Wno-strict-overflow -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections -fdata-sections -msse -msse2 -msse3 -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG-- Linker flags (Release): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -- Linker flags (Debug): -Wl,--exclude-libs,libippicv.a -Wl,--exclude-libs,libippiw.a -Wl,--gc-sections -Wl,--as-needed -- ccache: NO-- Precompiled headers: NO-- Extra dependencies: ade Qt5::Test Qt5::Concurrent Qt5::OpenGL Qt5::Core Qt5::Gui Qt5::Widgets /usr/lib/x86_64-linux-gnu/libfreetype.so /usr/lib/x86_64-linux-gnu/libharfbuzz.so /usr/lib/x86_64-linux-gnu/hdf5/serial/libhdf5.so /usr/lib/x86_64-linux-gnu/libpthread.so /usr/lib/x86_64-linux-gnu/libsz.so /usr/lib/x86_64-linux-gnu/libz.so /usr/lib/x86_64-linux-gnu/libdl.so /usr/lib/x86_64-linux-gnu/libm.so correspondence multiview numeric /usr/lib/x86_64-linux-gnu/libglog.so gflags_shared m pthread /usr/lib/x86_64-linux-gnu/libOpenGL.so /usr/lib/x86_64-linux-gnu/libGLX.so /usr/lib/x86_64-linux-gnu/libGLU.so cudart_static -lpthread dl rt nppc nppial nppicc nppidei nppif nppig nppim nppist nppisu nppitc npps cublas cudnn cufft -L/usr/local/cuda/lib64 -L/usr/lib/x86_64-linux-gnu-- 3rdparty dependencies: ittnotify libprotobuf zlib libjpeg-turbo libwebp libpng libtiff libjasper IlmImf quirc ippiw ippicv-- -- OpenCV modules:-- To be built: alphamat aruco bgsegm bioinspired calib3d ccalib core cudaarithm cudabgsegm cudacodec 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 java line_descriptor ml objdetect optflow phase_unwrapping photo plot python2 python3 quality rapid reg rgbd saliency sfm shape stereo stitching structured_light superres surface_matching text tracking ts video videoio videostab xfeatures2d ximgproc xobjdetect xphoto-- Disabled: world-- Disabled by dependency: --- Unavailable: cnn_3dobj js julia matlab ovis viz-- Applications: tests perf_tests examples apps-- Documentation: NO-- Non-free algorithms: YES-- -- GUI: -- QT: YES (ver 5.12.8)-- QT OpenGL support: YES (Qt5::OpenGL 5.12.8)-- GTK+: NO-- OpenGL support: YES (/usr/lib/x86_64-linux-gnu/libOpenGL.so /usr/lib/x86_64-linux-gnu/libGLX.so /usr/lib/x86_64-linux-gnu/libGLU.so)-- VTK support: NO-- -- Media I/O: -- ZLib: build (ver 1.2.11)-- JPEG: build-libjpeg-turbo (ver 2.0.5-62)-- WEBP: build (ver encoder: 0x020f)-- PNG: build (ver 1.6.37)-- TIFF: build (ver 42 - 4.0.10)-- JPEG 2000: build Jasper (ver 1.900.1)-- OpenEXR: build (ver 2.3.0)-- HDR: YES-- SUNRASTER: YES-- PXM: YES-- PFM: YES-- -- Video I/O:-- DC1394: NO-- FFMPEG: YES-- avcodec: YES (58.54.100)-- avformat: YES (58.29.100)-- avutil: YES (56.31.100)-- swscale: YES (5.5.100)-- avresample: NO-- GStreamer: YES (1.16.2)-- v4l/v4l2: YES (linux/videodev2.h)-- -- Parallel framework: pthreads-- -- Trace: YES (with Intel ITT)-- -- Other third-party libraries:-- Intel IPP: 2020.0.0 Gold [2020.0.0]-- at: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/3rdparty/ippicv/ippicv_lnx/icv-- Intel IPP IW: sources (2020.0.0)-- at: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/build/3rdparty/ippicv/ippicv_lnx/iw-- Lapack: NO-- Eigen: YES (ver 3.3.7)-- Custom HAL: NO-- Protobuf: build (3.5.1)-- -- NVIDIA CUDA: YES (ver 11.0, CUFFT CUBLAS)-- NVIDIA GPU arch: 30 35 37 50 52 60 61 70 75 80-- NVIDIA PTX archs:-- -- cuDNN: YES (ver 8.0.1)-- -- OpenCL: YES (no extra features)-- Include path: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/3rdparty/include/opencl/1.2-- Link libraries: Dynamic load-- -- Python 2:-- Interpreter: /usr/bin/python2.7 (ver 2.7.18)-- Libraries: /usr/lib/x86_64-linux-gnu/libpython2.7.so (ver 2.7.18rc1)-- numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.16.5)-- install path: /usr/lib/python2.7/dist-packages/cv2/python-2.7-- -- Python 3:-- Interpreter: /usr/bin/python3 (ver 3.8.2)-- Libraries: /usr/lib/x86_64-linux-gnu/libpython3.8.so (ver 3.8.2)-- numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.17.4)-- install path: /usr/lib/python3/dist-packages/cv2/python-3.8-- -- Python (for build): /usr/bin/python3-- -- Java: -- ant: /snap/bin/ant (ver 1.10.8)-- JNI: /usr/lib/jvm/jdk-14.0.1/include /usr/lib/jvm/jdk-14.0.1/include/linux /usr/lib/jvm/jdk-14.0.1/include-- Java wrappers: YES-- Java tests: YES-- -- Install to: /usr/local-- ------------------------------------------------------------------- -- Configuring done-- Generating done-- Build files have been written to: /home/plamen/Install/OpenCV_install_info/OpenCV/opencv/buildPlease, can somebody explain me why this option blocks the java? And do I need this option to be ON?