错误
编译ffmpeg时，报错：
libavdevice/xcbgrab.c:25:10: fatal error: xcb/xcb.h: 没有那个文件或目录 #include <xcb/xcb.h> ^~~~~~~~~~~ compilation terminated.
编译xcb
https://blog.csdn.net/quantum7/article/details/104502915
修改ffbuild/common.h
IFLAGS := -I/home/quantum6/lib-build/include/SDL2 -I/home/quantum6/lib-build/include -I. -I$(SRC_LINK)/
