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Xgraph Installation



Hi,
 
I have downloaded Xgraph and it 3 corresponding patches. However I keep getting this error when I ran "make" or "make install".
 
Being new to Linux, I have also read the READ.INSTALL but I don't understand <top-source-tree> means? Please advise.
 
Thanks.
Eric
 
 
xgraph.c: In function 'main':
xgraph.c:113: warning: passing arg 1 of 'XSetErrorHandler' from incompatible pointer type
cc     -I/usr/include      -c xgX.c -o xgX.o
cc     -I/usr/include      -c hard_devices.c -o hard_devices.o
cc     -I/usr/include      -c dialog.c -o dialog.o
cc     -I/usr/include      -c hpgl.c -o hpgl.o
 
hpgl.c: In function 'hpglInit':
hpgl.c:75: warning: return makes integer from pointer with a
cc     -I/usr/include      -c ps.c -o ps.o
cc     -I/usr/include      -c idraw.c -o idraw.o
cc     -I/usr/include      -c xtb.c -o xtb.o
 
xtb.c: In function 'xtb_lookup':
xtb.c:217: warning: passing arg 4 of 'XFindContext' from incompatible pointer type
cc     -I/usr/include      -c st.c -o st.o
cc     -I/usr/include      -c params.c -o params.o
cc     -I/usr/include      -c alloc.c -o alloc.o
cc     -I/usr/include      -c draw.c -o draw.o
cc     -I/usr/include      -c init.c -o init.o
 
init.c: In function 'InitSets':
init.c:143: warning: passing arg 2 of 'param-init' makes integer from pointer without cast
cc     -I/usr/include      -c read.c -o read.o
cc     -I/usr/include      -c tgif.c -o tgif.o
cc     -I/usr/include      -c derivative.c -o derivative.o
 
make : *** No rule to make target '/usr/lib/libXext.a', needed by 'xgraph'. Stop.