Looks like you need to install GCC (the linux compiler and GLIBC).
It should be with your distribution. If not try this link.
I don't know which distro you have. With mandrake you can use urpmq libgcc
to find it. I installed the rar
program from source.
Here is the link for the unrar rpm:
If your distribution uses debian, then try this link:
Now if you don't mind a little pet-peeve of mine. It would be nice if users on this board would fill in the distribution they are using. Then we don't have to ask and it would help solicit better help when the person answering uses the same distro. I'm not barking at anyone in particular, its just a general pet-peeve that has been bugging me.