On 21 September 2011 13:58, Leila M <mech.loulou at gmail.com> wrote: > I need to install g++-4.3 on ubuntu 11.04 (it already contain g++-4.5 but NS > 2 doesn't compile well with it) > can anyone help please, it's urgent Why not just install ns2 from the repo like this:- sudo apt-get install ns2 Cheers, Al.