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[ns] Problem with Xgraph



Hi all,
I successfully installed ns2.1b8 
But I have a problem with Xgraph.

OS: Mandrake 7.0      
ns: ns-allinone-2.1b8a.tar.gz
 

error message:

gcc -g -o xgraph xgraph.o xgx.o hard_devices.o dialog.o hpgl.o ps.o idr
aw.o xtb.o st.o params.o alloc.o draw.o init.o read.o tgif.o derivate.o -l
x11 -lm
/usr/bin/ld: cannot find -lx11
collect2: ld returned 1 exit status 
make: *** [xgraph] error 1

Best regards,
Salvatore Ascione