[arch-general] 32bit chroot in 64bit guest

I've got some packages to upgrade for both arches and I was wondering if it's possible to run a non-native chroot and stop resorting to virtual machines. Given that i686 binaries should be runnable on an x86_64 guest, i just used mkarchroot with an i686-configured pacman.conf, but I get a sudo error when it tries to run makepkg from makechrootpkg. makechrootpkg launches sudo only once, at line 202, and this is the full command: sudo -u nobody makepkg $MAKEPKG_ARGS || touch BUILD_FAILED Now, why require installing sudo in the chroot (standard procedure) if the 'sudo' and 'makepkg' commangs used are *outside* the chroot? Shouldn't they be run through 'mkarchroot -r' to allow cross compilation? Or am I missing something (as usual)? bardo