How to cross compile to an old i486/i586 architecture (Vortex86DX)

Question

I need to cross compile to Vortex86DX. It seens to have a i486/i586 architecure.

What packages is needed to install on Ubuntu ?

As stated here, just asking the compiler to -match=i586 doesn´t work as the libraries seens to be i686 built.

PS: I need support to C++11 (-std0x), so I need a gcc compiler that undestands that standard.

Thanks for helping.