Package opencv was not found in the pkg-config search path.opencv.c问

安装好后opencv后实验下面这条语句的时间出错：
pkg-config --cflags opencv

1. Package opencv was not found in the pkg-config search path.
2. Perhaps you should add the directory containing `opencv.pc'
3. to the PKG_CONFIG_PATH environment variable
4. No package 'opencv' found

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缘故原由： 缺失了opencv.pc这个设置信息文件
办理方法： 创建opencv.pc文件，注意添加的路径

1. cd /usr/local/lib
2. ls pkgconfig     // 如果没有该文件夹  进行创建  一般都有
3. sudo mkdir pkgconfig
4. cd pkgconfig
5. sudo touch opencv.pc  // 查看是否有opencv4.pc 有的话复制一下

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然后在opencv.pc中添加以下信息，注意这些信息需要与本身安装opencv时的库路径对应：

1. prefix=/usr/local
2. exec_prefix=${prefix}
3. includedir=${prefix}/include
4. libdir=${exec_prefix}/lib
6. Name: opencv
7. Description: The opencv library
8. Version:4.0.1
9. Cflags: -I${includedir}/opencv4
10. 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

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保存退出，然后将文件导入到环境变量：

1. export  PKG_CONFIG_PATH=/usr/local/lib/pkgconfig

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再实验 pkg-config --cflags --libs opencv时输出效果如下：

1. -I/usr/local/include/opencv4 -L/usr/local/lib \
2. -lopencv_shape -lopencv_stitching -lopencv_objdetect \
3. -lopencv_superres -lopencv_videostab -lopencv_calib3d \
4. -lopencv_features2d -lopencv_highgui -lopencv_videoio \
5. -lopencv_imgcodecs -lopencv_video -lopencv_photo -lopencv_ml \
6. -lopencv_imgproc -lopencv_flann -lopencv_core

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然后举行 make 如果照旧有问题 make之前先make clean 再次尝试 一般都会乐成
照旧有问题的话 看一下MakeFile 文件 是否添加opencv的头文件和库文件路径

来源：https://blog.csdn.net/weixin_44847326/article/details/127264380
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