用庫創建Makefile如何使用下面的命令創建一個簡單的makefile？ g++ -Wall -I/usr/include/opencv -I/usr/include/opencv2 -L/usr/lib/ -g -o exe sourc1.cpp sourc2.cpp sourc3.cpp -lopencv_core   -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib    -lopencv_legacy -lv4l1 -lv4l2 -lv4lconvert -pthread我引用了這個鏈接但我現在很困惑。