[ns] ns2.1b6a install problem

[myzhai <myzhai@sina.com>]

Hi,
  I install ns2.1b6a in Linux 6.0. Now I encounter the following question:

creating tkConfig.sh
cc -c -O   -I. -I./../generic -I./../bitmaps
-I/network/ns-allinone-2.1b6/tcl8.0.4/generic  -DHAVE_UNISTD_H=1
-DHAVE_LIMITS_H=1 -DSTDC_HEADERS=1 -DHAVE_SYS_TIME_H=1
-DTIME_WITH_SYS_TIME=1      ./../generic/tk3d.c
In file included from ../generic/tkInt.h:21,
                 from ../generic/tk3d.h:18,
                 from ./../generic/tk3d.c:16:
.../generic/tk.h:77: X11/Xlib.h: No such file or directory
make: *** [tk3d.o] Error 1
tk8.0.4 make failed! Exiting ...
For problems with Tcl/Tk see http://www.scriptics.com

How to solve yhe proble?

thx
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