how to downgrade gcc to version 4.1.1 if i am using 64-bit ubuntu 11.10 or 12.04? please notice that I'm using 64-bit version of ubuntu It may seems simlar to this question Old version of gcc for new Ubuntu but I can't solve it with the method provide in that thread I get some error like gcc-4.1 : Depends: cpp-4.1 (= 4.1.2-27ubuntu1) but it is not going to be installed can someone tell me how to do it? thanks