You can also use apt-rpm for RH to download and install 'em. You can go onto the gnome board at gnomesupport.org/fourms and ask on there. Someone will give you the apt-get repository list for it; I'm sorry I'd give ya it if I remembered it.
If you really want to build 'em from source you can get the sources from ftp.gnome.org and you can read the notes about gnome 2.4 @
www.gnome.org (somewhere in there they have the build order).
Goodluck