Thanks Helen for reply, about your idea of create a link to
libstdc++.so.6 I did it before install the old libraries and the error
was about FB doesn´t find libstdc++.so.5 (as in the very begining) And
in the threads I read that .so.6 isn´t compatible, this is the reason
because I decided to install the old libraries and obtain the results
that you know.

I'll try to install FB ntpl version and attend your recomendations if
something wrong I wrote to devel group.

Regards,

Jorge Quiroga