installing an older version of g++ on ubuntu 12.04

[mixpro]

iv'e started a question about this here :
http://old.nabble.com/installing-an-older-version-of-g%2B%2B-on-ubuntu-12.04-to33971892.html
http://old.nabble.com/installing-an-older-version-of-g%2B%2B-on-ubuntu-12.04-to33971892.html 

but then i couldn't complete it , cause i had to move it to this mailing
list , if anyone can help ,
i would appreciate it . 
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