[vlc] make #error Xlib required due to XInitThreads

[owl700 at gmail.com]

Hi, i'm using ubuntu 10.04 server to compile vlc 1.1.4, how can i resolve
this error?

CC     libvout_sdl_plugin_la-sdl.lo
sdl.c:46:4: error: #error Xlib required due to XInitThreads

Thanks
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