Build problem with buildroot config of Busybox?

I seem to have a knack for posting to the wrong list, but I think this is buildrot rather than BusyBox related. Having applied Berhard's trick to get me past the uClibc build problems I've now hit another snag. Buildroot *seems* to be trying to build BusyBox for an i386 even though I specified PowerPC. Is that right? I may be misinterpreting the error messages (which I have included below). I may have configured something incorrectly, but I thought there was only one place to select the target architecture.

Any ideas as to how to approach this problem greatly appreciated. -- Peter

make -j1 CC=/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/staging_dir/bin/powerpc-linux-uclibc-gcc CROSS_COMPILE="/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/staging_dir/bin/powerpc-linux-uclibc-" \

CROSS="/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/staging_dir/bin/powerpc-linux-uclibc-" PREFIX="/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/root"
\
EXTRA_CFLAGS="-Os -pipe " -C
/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/busybox
make[1]: Entering directory `/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/busybox'

  SPLIT   include/autoconf.h -> include/config/*
  GEN     include/bbconfigopts.h
  HOSTCC  applets/usage
  GEN     include/usage_compressed.h
  CC      applets/applets.o

cc1: error: invalid option `arch=i386'
cc1: error: invalid option `preferred-stack-boundary=2'
make[2]: *** [applets/applets.o] Error 1
make[1]: *** [applets] Error 2
make[1]: Leaving directory `/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/busybox'
make: *** [/home/pmendham/powerpc-405-linux-gnu/buildroot/build_powerpc_nofpu/busybox/busybox] Error 2