I will list here the packages you will need to install gcc 4.3-39 and remember to install these in the order given below :-
glibc-2.8-14.1
glibc-devel-2.8-14.1
gcc43-4.3.1_20080507-6.1
gcc-4.3-39.1

Download an rpm:- for eg samba. I am using a SUSE 11.x machine, may be i can enable the same using yast. Just consider this as an eg for installing a source rpm. I downloaded samba rpm :- samba-2.0.8-1.7.1.src.rpm
Run the command rpm -ivh samba-2.0.8-1.7.1.src.rpm
you will see the normal rpm installation graphics like :-
1:samba                  ########################################### [100%]
Rememebr [...]