To cross compile, you will need a dedicated tool - chain.
A tool chain is minimum : binutils, a libc,
the powerpc-linux-gnu-gcc compiler, all specially compiled
to produce code / binaries, which can run on the powerpc
processor. Also meaning : You cannot test the result on
The (only) recommended / maintained / updated tool is crosstool-NG
.. updated three weeks ago.
It is advisable to tell which Linux, you are using, every time
a question is asked ... like Fedora 11, RedhatEL5, CentOS 5.4 ...