I believe this is the same one I downloaded some time ago myself. It works very well. You may have to set your HTTP_PROXY environment variable if you're behind a firewall...wget is such a useful tool. Anyway - try HERE this page has a link to a zip file containing an OS X ready wget.
This is also available on your OSX disc, but the link above will give you the newest version. You probably don't need to worry about the large download if it's just gcc you're looking for, as the updates are primarily with XCode and the Cocoa Foundation stuff. I've got the latest developer tools install, and this is what I get:Tools will give you GCC. (it's pretty big though and might include a lot of stuff you don't want)
macbook:~ djames$ gcc -v
Using built-in specs.
Target: i686-apple-darwin8
Configured with: /private/var/tmp/gcc/gcc-5341.obj~1/src/configure --disable-checking -enable-werror --prefix=/usr --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg][^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with-slibdir=/usr/lib --build=powerpc-apple-darwin8 --with-arch=pentium-m --with-tune=prescott --program-prefix= --host=i686-apple-darwin8 --target=i686-apple-darwin8
Thread model: posix
gcc version 4.0.1 (Apple Computer, Inc. build 5341)
macbook:~ djames$
You generally cannot get Linux packages to run on OS X. Given the creativity and resoursefullness of some, I won't say it's impossible, but you're not going to do it easily.