@BlackNoxis: the problem in this topic has been solved (even if a feedback and an additional solution is always welcome), besides, your suggestions are not very good for the system, as compiling manually applications is a risk for the integrity of your installation, if you want to compile programs from sources portage is the safe and supported choice.
Of course, if you want to make experience, compiling manually from sources is a nice way of doing it, but it can break your system, so it is not recommended in a "safe" installation.