OpenCV2.4.13+Ubuntu18.04 配置

每次配环境都是一种折磨，记录以下这次的过程。
（如果用linux的免驱camera千万不要再尝试用windows配置OPENCV）

装依赖包

参考
https://gist.github.com/sedovolosiy/6711123a9e5a73a6ce519e80338d0067

# install dependencies
sudo apt-get update
sudo apt-get install -y build-essential
sudo apt-get install -y cmake
sudo apt-get install -y libgtk2.0-dev
sudo apt-get install -y pkg-config
sudo apt-get install -y python-numpy python-dev
sudo apt-get install -y libavcodec-dev libavformat-dev libswscale-dev
sudo apt-get install -y libjpeg-dev libpng12-dev libtiff5-dev libjasper-dev
 
sudo apt-get -qq install libopencv-dev build-essential checkinstall cmake pkg-config yasm libjpeg-dev libjasper-dev libavcodec-dev libavformat-dev libswscale-dev libdc1394-22-dev libxine2 libgstreamer0.10-dev libgstreamer-plugins-base0.10-dev libv4l-dev python-dev python-numpy libtbb-dev libqt4-dev libgtk2.0-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev x264 v4l-utils

最后一行中那几个包你不需要的话，找不到也不要紧。

其中，libjasper-dev安装不成功解决办法：
via https://blog.csdn.net/weixin_41053564/article/details/81254410

sudo add-apt-repository "deb [http://security.ubuntu.com/ubuntu](http://security.ubuntu.com/ubuntu) xenial-security main"
sudo apt update
sudo apt install libjasper1 libjasper-dev

下载解压opencv

请各显神通
我的方式还是参考上面的github，在Download文件夹下：

# download opencv-2.4.13
wget http://downloads.sourceforge.net/project/opencvlibrary/opencv-unix/2.4.13/opencv-2.4.13.zip
unzip opencv-2.4.13.zip
cd opencv-2.4.13
mkdir release
cd release

编译安装

只参考github会报很多错，解决办法都在这里：

1. OpenCV CMake package version error 版本号没有定义
   https://codeyarns.com/2017/12/24/opencv-cmake-package-version-error/
2. CMake Error at cmake/OpenCVDetectCXXCompiler.cmake ：
   https://answers.opencv.org/question/65548/cmake-error-at-cmakeopencvdetectcxxcompilercmake/
   解决方法是改opencv-2.4.13/cmake文件夹里的两个文件。

然后参考https://blog.csdn.net/zbzb1000/article/details/81431685 和 https://blog.csdn.net/u012116133/article/details/78559859
（会报fatal error: stdlib.h: No such file or directory这个错）：

# compile and install
cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D ENABLE_PRECOMPILED_HEADERS=OFF ..
make -j6 #根据自己的情况改数字，报错的话要么看log，要么单线程跑。
sudo make install