[ns] error running Xgraph

[choh Andrew]

Hi all,
               I encounter this error when i tried to run one of the 
programs using xgraph in the ns tutorial, below is the error. Can anyone 
help me solve this error?


When configured, ns found the right version of tclsh in 
/home/2.27/bin/tclsh8.4
but it doesn't seem to be there anymore, so ns will fall back on running the 
first tclsh in your path. The wrong version of tclsh may break the test 
suites. Reconfigure and rebuild ns if this is a problem.
ns: finish: couldn't execute "xgraph": no such file or directory
    while executing
"exec xgraph out0.tr out1.tr out2.tr -geometry 800x400 &"
    (procedure "finish" line 8)
    invoked from within
"finish"

thanks in advance.

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