pkg-config --modversion opencvPackage opencv was not found in the pkg-config search path.Perhaps y
此方法针对使用源码安装了opencv，出现No package 'opencv' found的小伙伴
pkg-config --cflags --libs opencvPackage opencv was not found in the pkg-config search path.Perhaps you should add the directory containing `opencv.pc'to the PKG_CONFIG_PATH environment variableNo package 'opencv' foundnvidia@nvidia-desktop:/usr/local/lib$ sudo mkdir pkgconfig[sudo] password for nvidia:nvidia@nvidia-desktop:/usr/local/lib$ cd pkgconfignvidia@nvidia-desktop:/usr/local/lib/pkgconfig$ sudo touch opencv.pcnvidia@nvidia-desktop:/usr/local/lib/pkgconfig$ vi opencv.pcnvidia@nvidia-desktop:/usr/local/lib/pkgconfig$ sudo vi opencv.pcnvidia@nvidia-desktop:/usr/local/lib/pkgconfig$ export PKG_CONFIG_PATH=/usr/local/lib/pkgconfignvidia@nvidia-desktop:/usr/local/lib/pkgconfig$ pkg-config --cflags --libs opencv-I/usr/local/include/opencv4 -L/usr/local/lib -lopencv_shape -lopencv_stitching -lopencv_objdetect -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann -lopencv_coreopencv.pc内容如下prefix=/usr/localexec_prefix=${prefix}includedir=${prefix}/includelibdir=${exec_prefix}/libName: opencvDescription: The opencv libraryVersion:4.1.0Cflags: -I${includedir}/opencv4Libs: -L${libdir} -lopencv_shape -lopencv_stitching -lopencv_objdetect -lopencv_superres -lopencv_videostab -lopencv_calib3d -lopencv_features2d -lopencv_highgui -lopencv_videoio -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml -lopencv_imgproc -lopencv_flann -lopencv_core~nvidia@nvidia-desktop:~/Nano/OpenCV4.1/opencv-4.1.0/samples/cpp/example_cmake/build$ sudo cmake ..-- The C compiler identification is GNU 7.5.0-- The CXX compiler identification is GNU 7.5.0-- 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-- Detecting C compile features-- Detecting C compile features - done-- 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-- Detecting CXX compile features-- Detecting CXX compile features - done-- Looking for pthread.h-- Looking for pthread.h - found-- Looking for pthread_create-- Looking for pthread_create - not found-- Looking for pthread_create in pthreads-- Looking for pthread_create in pthreads - not found-- Looking for pthread_create in pthread-- Looking for pthread_create in pthread - found-- Found Threads: TRUE-- Found CUDA: /usr/local/cuda (found suitable exact version "10.2")-- Found OpenCV: /usr/local (found version "4.1.0")-- OpenCV library status:-- config: /usr/local/lib/cmake/opencv4-- version: 4.1.0-- libraries: opencv_calib3d;opencv_core;opencv_dnn;opencv_features2d;opencv_flann;opencv_gapi;opencv_highgui;opencv_imgcodecs;opencv_imgproc;opencv_ml;opencv_objdetect;opencv_photo;opencv_stitching;opencv_video;opencv_videoio;opencv_aruco;opencv_bgsegm;opencv_bioinspired;opencv_ccalib;opencv_cudaarithm;opencv_cudabgsegm;opencv_cudacodec;opencv_cudafeatures2d;opencv_cudafilters;opencv_cudaimgproc;opencv_cudalegacy;opencv_cudaobjdetect;opencv_cudaoptflow;opencv_cudastereo;opencv_cudawarping;opencv_cudev;opencv_datasets;opencv_dnn_objdetect;opencv_dpm;opencv_face;opencv_freetype;opencv_fuzzy;opencv_hfs;opencv_img_hash;opencv_line_descriptor;opencv_optflow;opencv_phase_unwrapping;opencv_plot;opencv_quality;opencv_reg;opencv_rgbd;opencv_saliency;opencv_shape;opencv_stereo;opencv_structured_light;opencv_superres;opencv_surface_matching;opencv_text;opencv_tracking;opencv_videostab;opencv_xfeatures2d;opencv_ximgproc;opencv_xobjdetect;opencv_xphoto-- include path: /usr/local/include/opencv4-- Configuring done-- Generating done-- Build files have been written to: /home/nvidia/Nano/OpenCV4.1/opencv-4.1.0/samples/cpp/example_cmake/buildnvidia@nvidia-desktop:~/Nano/OpenCV4.1/opencv-4.1.0/samples/cpp/example_cmake/build$ sudo makeScanning dependencies of target opencv_example[ 50%] Building CXX object CMakeFiles/opencv_example.dir/example.cpp.o[100%] Linking CXX executable opencv_example[100%] Built target opencv_examplenvidia@nvidia-desktop:~/Nano/OpenCV4.1/opencv-4.1.0/samples/cpp/example_cmake/build$ lsCMakeCache.txt CMakeFiles cmake_install.cmake Makefile opencv_examplenvidia@nvidia-desktop:~/Nano/OpenCV4.1/opencv-4.1.0/samples/cpp/example_cmake/build$ ./opencv_exampleBuilt with OpenCV 4.1.0VIDEOIO ERROR: V4L: can't open camera by index 0No capture
