Thanks a lot John VV & johnsfine for your help.
Well, i tried before on backtrack 5, and everything was normal and work nicely.
The issue why i am not using Backtrack 5 is that still i am having some problem with it, like sounds, etc,,,
But i will give a try to remove the old version of gcc and to install the updated one.
thanks againa guys for your help.
Well, after downloading latest version, i tried to read some paper on how to install gcc, i think it is so complicated
is it correct?
This is the link which i used: