install NS 2 on Ubuntu

[Leila M]

Hi, I was using Ubuntu 9.04 but now I moved to Ubuntu 11.04 and I'm trying
to install NS 2.34. when executing the following command:
./install

I got the following error :

...
 from
/home/leila/loulou/ns-allinone-2.34/tk8.4.18/unix/../generic/tk3d.c:16:
/home/leila/loulou/ns-allinone-2.34/tk8.4.18/unix/../generic/tk.h:81:23:
fatal error: X11/Xlib.h: No such file or directory
compilation terminated.
make: *** [tk3d.o] Error 1
tk8.4.18 make failed! Exiting ...
For problems with Tcl/Tk see http://www.scriptics.com
leila at leila-M925:~/loulou/ns-allinone-2.34$

please help me
thanks in advance
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