Several errors encountered when installing opencv

error 1：

/home/xx/xx/opencv-3.4.x/opencv_contrib/modules/xfeatures2d/src/boostdesc.cpp:653:20: fatal error: boostdesc_bgm.i: No such file or directory

You need to download several files manually （ Link to comment area , Avoid link failure , I put resources Upload to CSDN）, Then put it in the corresponding directory opencv_contrib-3.4.x/modules/xfeatures2d/src/ in .

error 2：

fatal error: opencv2/xfeatures2d/cuda.hpp: No such file or directory
Method 1：
According to the error information , open /home/xx/xx/opencv-3.4.x/modules/stitching/include/opencv2/stitching/detail/matchers.hpp file , take 52 That's ok
#include “opencv2/xfeatures2d/cuda.hpp”
Replace with #include “/home/xx/xx/opencv-3.4.x/opencv_contrib-3.4.x/modules/xfeatures2d/include/opencv2/xfeatures2d/cuda.hpp”
Method 2：
stay /home/xx/xx/opencv-3.4.x/modules/stitching/CMakeLists.txt Add INCLUDE_DIRECTORIES("/home/src/software/opencv-3.4.2/opencv_contrib-3.4.2/modules/xfeatures2d/include")

( The above directories need to be modified into their own actual directories )