a probelm

[Wenting Tang <tangwen1@cps.msu.edu>]

Dear Sir,

I tried very hard to install ns version 2 ( download from 
web ), when I run the test-suite tahoe1 , I 
got error message:

ns: close file3 ; finish test_tahoe2: couldn't execute "xgraph": no such
file or directory
    while executing
"exec xgraph -bb -tk -nl -m -x time -y packet temp.rands &"
    (procedure "finish" line 43)
    invoked from within
"finish test_tahoe2"

I think xgraph maybe is a function or a utility, 
I am not sure.  and Also if it is a utility,
may I change it for other utilities?

thank you.

Wenting Tang

Michigan State Universiyt.