ubuntu安装opencv遇到的问题

自己记录的问题及解决方法

完整的安装方法参考

[添加链接描述](https://www.jianshu.com/p/f646448da265)
[添加链接描述](https://blog.csdn.net/qq_27278957/article/details/100674085)

问题1：Ubuntu 或者 Debian 系统显示窗口的时候遇到了这个问题

error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function ‘cvNamedWindow

sudo apt-get install install libgtk2.0-dev pkg-config

安装成功后，重新编译opencv源码

问题2Package opencv was not found in the pkg-config search path.

查看opencv版本的指令

pkg-config opencv --libs
pkg-config opencv --modversion

出现这个错误，缺失了opencv.pc这个配置信息文件，故解决方法就是添加这个文件然后将其导入到环境变量中，具体操作如下

cd /usr/local/lib
sudo mkdir pkgconfig
cd pkgconfig
sudo touch opencv.pc

然后在opencv.pc中添加以下信息，注意这些信息需要与自己安装opencv时的库路径对应

prefix=/usr/local
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib

Name: opencv
Description: The opencv library
Version:4.0.1
Cflags: -I${includedir}/opencv4
Libs: -L${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

保存退出，然后将文件导入到环境变量

export  PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
sudo ldconfig