checking whether ln -s works... yes
checking FOR x86_64-unknown-linux-gnu-gcc... /home/bchao/rpmbuild/SOURCES/gcc4.5/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/home/bchao/rpmbuild/SOURCES/gcc4.5/host-x86_64-unknown-linux-gnu/gcc/ -B/usr/LOCAL/x86_64-unknown-linux-gnu/bin/ -B/usr/LOCAL/x86_64-unknown-linux-gnu/lib/ -isystem /usr/LOCAL/x86_64-unknown-linux-gnu/include -isystem /usr/LOCAL/x86_64-unknown-linux-gnu/sys-include
checking FOR suffix of object files... configure: error: in `/home/bchao/rpmbuild/SOURCES/gcc4.5/x86_64-unknown-linux-gnu/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' FOR more details.
make[2]: *** [configure-stage1-target-libgcc] Error 1
make[2]: Leaving directory `/home/bchao/rpmbuild/SOURCES/gcc4.5'
make[1]: *** [stage1-bubble] Error 2
make[1]: Leaving directory `/home/bchao/rpmbuild/SOURCES/gcc4.5'
make: *** [all] Error 2