i'm trying to install GCC on a brand new install of Fedora Core 3
Unless I'm missing something here (and I may well be - I'm really only a newbie myself) GCC is installed by default in FC1,2 and 3.
Check to see if it's already there by opening a terminal and typing gcc --version
. If you get anything other than an error you have GCC already installed.
If you don't have it installed go back to your FC3 installation CDs / DVD and install it using the menu option whose name I forget for the moment (sorry I'm at work on an XP box at the moment).
Hope that helps