Using gdb on 10.6.2 to debug a ppc binary

Is it possible to debug a PPC binary on 10.6.2 using the version of gdb that comes with Xcode 3.2.1? I have been sifting through the internet for a couple of hours now and have not seen this question asked anywhere. Currently this is what I am trying to do. I 'cd' into the directory of the PPC binary within the PPC.app directory. I then launch gdb using *gdb -arch ppc program* Some of the output looks like this: "This GDB was configured as "--host=x86_64-apple-darwin --target=powerpc-apple-darwin"...Reading symbols for shared libraries ... done" When I issue the run command I get "Don't know how to run. Try "help target"." I have no idea why this PPC will not run, but if anyone has any experience with this please let me know.

cheers.