gcc 64-bit library support ?

Hi - I'm trying to build a 64-bit "Hello world" program on under SuSE 10 on a G5 Xserve. It looks like there are no 64-bit libraries as I get the following:

gcc -m64 fred.c -o fred.o /usr/bin/ld: skipping incompatible /usr/lib/gcc/powerpc64-suse-linux/ 4.0.2/../../../libc.so when searching for -lc /usr/bin/ld: skipping incompatible /usr/lib/gcc/powerpc64-suse-linux/ 4.0.2/../../../libc.a when searching for -lc /usr/bin/ld: skipping incompatible /usr/lib/libc.so when searching for -lc /usr/bin/ld: skipping incompatible /usr/lib/libc.a when searching for -lc /usr/bin/ld: cannot find -lc

collect2: ld returned 1 exit status >

I'd appreciate any clues as to what I need to do to build/install 64- bit library support. Thanks, Paul