the error is quite clear, the file isn't on your system or isn't where it is supposed to be, what distro do you use, SUSE, Mandrake, Slackware, RedHat...? Plz fill that in on your form, otherwise it is hard to help.
There are 2 things you could do:
1* use your package system (urpmi (rpm-based distro's ), apt-get (debian-based), swaret (slack)) to install a package called libstdc++ (if that doesn't work you'll need libstdc++-devel). I can't help on how to use your package system till you tell me what distro you're on...
2* Compile it from scratch. I would only do this if it doesn't work using the package system. Often compiling software isn't hard, but in the beginning it will look frightening. Even worse, it is discouraged to build this library on its own.
So, just give me your distro and I'll give you a straight answer