The compiled linux binary won't run on linux/ppc. You could try the native macosx version, if you have mac os installed.
As far as I know, nobody has compiled on linux/ppc (at least not recently)
In theory it should work with similar instructions to
http://vaalnor.mine.nu/psdoc/?q=node/34 but you should make sure that those /etc/apt/sources.list lines will work with ppc linux (Induane in #planeshift-build or someone in #ubuntu-ppc on irc.freenode.net may know)
If you're averse to compiling, this might be worth a try but it seems quite out of date:
http://www.maconlinux.org/Edit: I suppose I should add that nobody I know in #planeshift-build has linux on ppc installed, so it may be hard to get help if something goes wrong.
josePhoenix