FC 6 is installed successfully.
I had done
su -c "yum install compat-libstdc++-33 compat-libstdc++-296"
su -c "yum install compat-gcc-34 compat-gcc-34-c++"
which added gcc / g++ 3.4 in addition to the existing gcc / g++ 4.1.1.
If I want to add gcc / g++ 2.96 to support old linux programs, what is the best way to do it?