error in make run/demo

[Bulusu Kartik]

Hi,
I have genode 13.08 and installed genode-toolchain-11.11.tar.bz2.
I have further created build.lx directory
I am getting following error when I am giving make run/demo command.

Program drivers/framebuffer/sdl/fb_sdl
    COMPILE  fb_sdl.o
/home/kartikpradyumna/Downloads/genode-13.08/os/src/drivers/framebuffer/sdl/fb_sdl.cc:15:21:
fatal error: SDL/SDL.h: No such file or directory
compilation terminated.
make[3]: *** [fb_sdl.o] Error 1
make[2]: *** [fb_sdl.prg] Error 2
make[1]: *** [gen_deps_and_build_targets] Error 2
make[1]: Leaving directory
`/home/kartikpradyumna/Downloads/genode-13.08/build.lx'
Error: Genode build failed
make: *** [run/demo] Error 252

How to rectify this error?

Thank you.
Kartik
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