help : problem in installing xgraph package in solaris 2.5.1 system

[Cheng Lin TAN <cwctancl@leonis.nus.sg>]

hi all,

thanks to all for the previous hints given.  i managed to build the ns2
without any error.

i am having some problem trying to install xgraph on my solaris 2.5.1
system.  When i type 'make -f Makefile', all .c are compiled into .o
files, but the following mssg is shown :

make: Fatal error: Don't know how to make target `/usr/lib/libXext.a'

few questions :
1.  Is the X11R6.3 package necessary to install xgraph?
2.  I have untar the X11R6.3 such that the X11 directory structure is: 
/program/X11R63/root/usr/local/X11R6.3/bin/.......
3.  How can i use the make TOP=<source-tree-top> command>
what will be source-tree-top for my configuration?
4.  Am i supposed to change the Makefile? or using Imake?

thanks in advance for any hints given!