Installing GCC-4.3.0 in Fedora 16

[R Logeshwaran]

Hi I'm a research scholar doing my research in networking for that i use
NS-2 package (ns-allinone-2.29). it will work good in Fedora-9 which uses
GCC-4.3.
My system is a new one it is not possible for me to install Fedora-9. So i
have installed Fedora 16, but now NS.2.29 is not working in fedora 16 since
the GCC compiler is 4.6.
so i need a solution to downgrade gcc to 4.3.0 version. else solution to
run NS2.29 in fedora16
please help me...
thanking you
-- 
Be Awesome like
Logesh
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