At last I found people having the same problem as mine. As I am an absolute beginner in Linux, the perfect solution given by Lithorus doesn't mean anything to me
I would be most grateful if someone told me what to do with that gcc 3.4 and as a consequence how to solve the problem.
I have Mandriva 2005 LE, kernel linux-2.6.11-6mdk (that's the subdir from /usr/src)
Thank you in advance!