How to install older gcc version? CUDA toolkit.

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I'm looking forward to develop CUDA applications, however the latest version is prepared for Fedora 16 and I'm using 17 for quite long time. I've tried this one, but it looks like I have wrong gcc version (too new). I probably need gcc 4.5. There is a way to have both versions, and simply set one as primary, but I don't even knot hot to install older version. gcc is divided into so many packages that I don't really know what to install. I assume I need packages for previous version of Fedora, but which exactly?

By the way, don't you know about any beta releases of CUDA toolkit that might support GCC 4.7?