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Topology?

Hello,
    I meet problems when I try to install the GT-ITM topolgoy generator.
    Under my OS (RedHat 5.2, keneral is 2.2.6), I could not 
compile it well. When I "make", it responses NBBY is undefined in 
geog.c. I find there is a definition of NBBY in dfs.c. So, I insert the 
same definition in geog.c.
    
When I "make" again, it still reports:

ld:../lib/libgb4.a: file format not recognized; treating as linker script
ld:../lib/libgb4.a:1: parse error
make: *** [itm] Error 1

     I do not know how to get over it. Is there anybody who can help me?

   In addtion, I try to simulate complicated situation in network and I 
am going to use NS-2 as my simulation platform. I do not know whether I 
can directly use a ready-made topology generator to produce a specific 
topology which is fit for me. Who can give me an estimation?
My specific case is, I need there are many senders, receivers and flows 
in my simulation. Flows should include real time flows, best 
effort flows. They should randomly and respectively begin and end 
their sessions in my simulation. 


     Best Regards,

          Sun Kai