Finally, I have switch to extra-devel just for the installing of octave (and remove the extra-devel afterwards).

Thanks to developers, I think it is a pretty tool. By the way, I guess you realized the '=' symbol is slower to use than others that are directly in keyboard (at least in Pt and Spanish ones). There are 2 possibilities for users to solve that, modifying the layout when opening octave (through a shell script) or smarter to define a new operator equal to the '='. I don't remember what should i do for the last option. If somebody remember, please reply me, otherwise I will write it here when I found how it was as I guess it will be interesting for others.

I think this is a beautiful tool as it convert your cell into the "better" programmable calculator.