Now, first we'll have to download and build the dependency libs we're needing for our build. SDL is the only required one, plus whatever optional libs you want, like libMAD, Ogg Vorbis, etc, etc. If you include zlib, there's some special instructions below.
The twist here, is that you should install these libs to a
seperate location from the regular system libraries. Since we're compiling PPC 10.2 specific versions, we don't want to overwrite our regular libraries. I went with /opt/1028libs/. Just set this with the --prefix option to the ./configure script, for all the libraries you're including. Do this, and make sure you've defined the above environmental libraries both when you do ./configure and when you do make, and you should be set.
Once you've set up all the dependency libraries, you're ready to build ScummVM itself.