OpenCV 的构建出现错误，这些严重吗？
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【中文标题】OpenCV 的构建出现错误，这些严重吗？【英文标题】：Build of OpenCV getting errors, are these serious? 【发布时间】：2017-10-08 19:22:30 【问题描述】：我是 Raspberry Pi（以及命令行构建等）的新手。这是我从构建 OpenCV 中得到的输出：
pi@SamPi:~/opencv-3.1.0/build $ cmake -D CMAKE_BUILD_TYPE=RELEASE \
> -D CMAKE_INSTALL_PREFIX=/usr/local \
> -D INSTALL_PYTHON_EXAMPLES=ON \
> -D OPENCV_EXTRA_MODULES_PATH=~/opencv_contrib-3.1.0/modules \
> -D BUILD_EXAMPLES=ON ..
-- The CXX compiler identification is GNU 4.9.2
-- The C compiler identification is GNU 4.9.2
-- Performing Test HAVE_CXX_WMISSING_PROTOTYPES
-- Performing Test HAVE_CXX_WMISSING_PROTOTYPES - Failed
-- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES
-- Performing Test HAVE_CXX_WSTRICT_PROTOTYPES - Failed
-- Performing Test HAVE_C_WSIGN_PROMO
-- Performing Test HAVE_C_WSIGN_PROMO - Failed
-- 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 HAVE_CXX_WNO_UNNAMED_TYPE_TEMPLATE_ARGS - Failed
-- Performing Test HAVE_C_WNO_UNNAMED_TYPE_TEMPLATE_ARGS
-- Performing Test HAVE_C_WNO_UNNAMED_TYPE_TEMPLATE_ARGS - Failed
-- Performing Test HAVE_C_FVISIBILITY_INLINES_HIDDEN
-- Performing Test HAVE_C_FVISIBILITY_INLINES_HIDDEN - Failed
-- Looking for io.h
-- Looking for io.h - not found
-- Looking for jbg_newlen
-- Looking for jbg_newlen - not found
-- Looking for sys/videoio.h
-- Looking for sys/videoio.h - not found
-- Looking for ffmpeg/avformat.h
-- Looking for ffmpeg/avformat.h - not found
-- Checking for module 'libgphoto2'
-- No package 'libgphoto2' found
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- To enable PlantUML support, set PLANTUML_JAR environment variable or pass -DPLANTUML_JAR=<filepath> option to cmake
-- Could NOT find JNI (missing: JAVA_AWT_LIBRARY JAVA_JVM_LIBRARY JAVA_INCLUDE_PATH JAVA_INCLUDE_PATH2 JAVA_AWT_INCLUDE_PATH)
-- 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: NO
-- Glog: NO
-- Could NOT find HDF5 (missing: HDF5_LIBRARIES HDF5_INCLUDE_DIRS HDF5_HL_LIBRARIES)
-- Checking SFM deps... FALSE
-- Module opencv_sfm disabled because the following dependencies are not found: Eigen Glog/Gflags
-- Tesseract: NO
-- Performing Test HAVE_CXX_WNO_MISSING_PROTOTYPES
-- Performing Test HAVE_CXX_WNO_MISSING_PROTOTYPES - Failed
-- Performing Test HAVE_CXX_WNO_TAUTOLOGICAL_UNDEFINED_COMPARE
-- Performing Test HAVE_CXX_WNO_TAUTOLOGICAL_UNDEFINED_COMPARE - Failed
-- Tesseract: NO
--
-- General configuration for OpenCV 3.1.0 =====================================
-- Version control: unknown
--
-- Platform:
-- Host: Linux 4.9.35-v7+ armv7l
-- CMake: 3.6.2
-- CMake generator: Unix Makefiles
-- CMake build tool: /usr/bin/make
-- Configuration: RELEASE
--
-- C/C++:
-- Built as dynamic libs?: YES
-- C++ Compiler: /usr/bin/c++ (ver 4.9.2)
-- 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 -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -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 -Wno-narrowing -Wno-delete-non-virtual-dtor -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -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=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=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 -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -fdiagnostics-show-option -pthread -fomit-frame-pointer -ffunction-sections -fvisibility=hidden -g -O0 -DDEBUG -D_DEBUG
-- Linker flags (Release):
-- Linker flags (Debug):
-- Precompiled headers: YES
-- Extra dependencies: /usr/lib/arm-linux-gnueabihf/libpng.so /usr/lib/arm-linux-gnueabihf/libz.so gtk-x11-2.0 gdk-x11-2.0 pangocairo-1.0 atk-1.0 cairo gdk_pixbuf-2.0 gio-2.0 pangoft2-1.0 pango-1.0 gobject-2.0 fontconfig freetype gthread-2.0 glib-2.0 v4l1 v4l2 avcodec avformat avutil swscale avresample dl m pthread rt
-- 3rdparty dependencies: libjpeg libwebp libtiff libjasper IlmImf libprotobuf
--
-- OpenCV modules:
-- To be built: core flann imgproc ml photo reg surface_matching video dnn fuzzy imgcodecs shape videoio highgui objdetect plot superres ts xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib datasets rgbd stereo structured_light tracking videostab xfeatures2d ximgproc aruco optflow stitching python2 python3
-- Disabled: world contrib_world
-- Disabled by dependency: -
-- Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java viz cvv hdf matlab sfm
--
-- GUI:
-- QT: NO
-- GTK+ 2.x: YES (ver 2.24.25)
-- GThread : YES (ver 2.42.1)
-- GtkGlExt: NO
-- OpenGL support: NO
-- VTK support: NO
--
-- Media I/O:
-- ZLib: /usr/lib/arm-linux-gnueabihf/libz.so (ver 1.2.8)
-- JPEG: libjpeg (ver 90)
-- WEBP: build (ver 0.3.1)
-- PNG: /usr/lib/arm-linux-gnueabihf/libpng.so (ver 1.2.50)
-- TIFF: build (ver 42 - 4.0.2)
-- JPEG 2000: build (ver 1.900.1)
-- OpenEXR: build (ver 1.7.1)
-- GDAL: NO
--
-- Video I/O:
-- DC1394 1.x: NO
-- DC1394 2.x: NO
-- FFMPEG: YES
-- codec: YES (ver 56.1.0)
-- format: YES (ver 56.1.0)
-- util: YES (ver 54.3.0)
-- swscale: YES (ver 3.0.0)
-- resample: YES (ver 2.1.0)
-- gentoo-style: YES
-- GStreamer: NO
-- OpenNI: NO
-- OpenNI PrimeSensor Modules: NO
-- OpenNI2: NO
-- PvAPI: NO
-- GigEVisionSDK: NO
-- UniCap: NO
-- UniCap ucil: NO
-- V4L/V4L2: Using libv4l1 (ver 1.6.0) / libv4l2 (ver 1.6.0)
-- XIMEA: NO
-- Xine: NO
-- gPhoto2: NO
--
-- Parallel framework: pthreads
--
-- Other third-party libraries:
-- Use IPP: NO
-- Use VA: NO
-- Use Intel VA-API/OpenCL: NO
-- Use Eigen: NO
-- Use Cuda: NO
-- Use OpenCL: YES
-- Use custom HAL: NO
--
-- OpenCL:
-- Version: dynamic
-- Include path: /home/pi/opencv-3.1.0/3rdparty/include/opencl/1.2
-- Use AMDFFT: NO
-- Use AMDBLAS: NO
--
-- Python 2:
-- Interpreter: /usr/bin/python2.7 (ver 2.7.9)
-- Libraries: /usr/lib/arm-linux-gnueabihf/libpython2.7.so (ver 2.7.9)
-- numpy: /usr/lib/python2.7/dist-packages/numpy/core/include (ver 1.8.2)
-- packages path: lib/python2.7/dist-packages
--
-- Python 3:
-- Interpreter: /usr/bin/python3.4 (ver 3.4.2)
-- Libraries: /usr/lib/arm-linux-gnueabihf/libpython3.4m.so (ver 3.4.2)
-- numpy: /usr/lib/python3/dist-packages/numpy/core/include (ver 1.8.2)
-- packages path: lib/python3.4/dist-packages
--
-- Python (for build): /usr/bin/python2.7
--
-- Java:
-- ant: NO
-- JNI: NO
-- Java wrappers: NO
-- Java tests: NO
--
-- Matlab: Matlab not found or implicitly disabled
--
-- Documentation:
-- Doxygen: NO
-- PlantUML: NO
--
-- Tests and samples:
-- Tests: YES
-- Performance tests: YES
-- C/C++ Examples: YES
--
-- Install path: /usr/local
--
-- cvconfig.h is in: /home/pi/opencv-3.1.0/build
-- -----------------------------------------------------------------
--
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/opencv-3.1.0/build
很多这些错误看起来很奇怪，因为我经历了 1.5 小时专门为此安装下载和升级文件（请参阅教程
https://www.pyimagesearch.com/2016/04/18/install-guide-raspberry-pi-3-raspbian-jessie-opencv-3/
可以肯定我下载了 Java，但它说丢失了。我下载了一堆图像文件格式的东西，但它说我似乎缺少基本的videoio，即使只是普通的io！这是怎么回事？我已经着手制作了，以后我可以将这些丢失的文件导入 OpenCV 吗？
【问题讨论】：
【参考方案1】：您需要重新启动虚拟环境 $ mkvirtualenv cv -p python2
【讨论】：
教程说这是建议但不是必需的？ 我确实尝试过做环境方面的工作，但由于将 .profile 更改为 append:export WORKON_HOME=$HOME/.virtualenvs source /usr/local/bin/virtualenvwrapper.sh 时出错以上是关于OpenCV 的构建出现错误，这些严重吗？的主要内容，如果未能解决你的问题，请参考以下文章
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