installing an older version of g++ on ubuntu 12.04

[mixpro]

i found libgcc_s in :
/usr/lib/gcc/i686-linux-gnu/4.6/libgcc_s.so
/usr/lib/gcc/i486-linux-gnu/3.4.6/64/libgcc_s.so
/usr/lib/gcc/i486-linux-gnu/3.4.6/64/libgcc_s_64.so
/usr/lib/gcc/i486-linux-gnu/3.4.6/libgcc_s.so
/usr/lib/gcc/i486-linux-gnu/3.4.6/libgcc_s_64.so
/lib/i386-linux-gnu/libgcc_s.so.1

and i tried :
cd /usr/lib/i386-linux-gnu
sudo ln -s /usr/lib/gcc/i486-linux-gnu/3.4.6/libgcc_s.so libgcc_s.so

but i still get the same error 
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