Hi, how can I solve this problem in the compilation process: ffplay.o(.text+0x4af4): In function `main': /root/ffmpeg/ffmpeg/ffplay.c:2455: undefined reference to `XOpenDisplay' ffplay.o(.text+0x4b2c):/root/ffmpeg/ffmpeg/ffplay.c:2459: undefined reference to`XCloseDisplay' collect2: ld returned 1 exit status make: *** [ffplay_g] Error 1 Thanks in advance, Peter