Version for iMac OS X version 10.4.10

[Nelson Max]

I have been looking on the GNU web pages for instructions on downloading 
a version of gcc (and also of gdb) that will work under OS X on my Apple 
iMac. I do not see this listed as a supported system, although I know 
that it has an Intel CPU. Also, there were so many versions available 
that I picked a "random" recent one, and found that the documentation 
was incomplete, for example, the README document in the install 
directory said only that the directory had been obsoleted for CGG 
snapshots and CVS access, implying, I think, that this was not a version 
I wanted to download. Can you help me find an appropriate version, and 
appropriate downloading and installation instructions? Thank you.