Nobody uses realplayer on linux so I doubt you'll find any help.
Your better off getting mplayer to work.
You use fedora? How did you try installing it before? The best method is with apt/yum. You'll need the repository from http://www.fedora.us in your config file, and the "taboo" mplayer packages are available off the repository at http://rpm.livna.org (as is mp3 playback for xmms and the such.)