The autobuilds directory contains a few rounds of older stages, while
current-stage3 has only the most recent stage.
NAMESPACE="${NAMESPACE:-wking}"
DATE="${DATE:-20140206}"
MIRROR="${MIRROR:-http://distfiles.gentoo.org/}"
-ARCH_URL="${ARCH_URL:-${MIRROR}releases/amd64/current-stage3/}"
+ARCH_URL="${ARCH_URL:-${MIRROR}releases/amd64/autobuilds/${DATE}/}"
STAGE3="${STAGE3:-stage3-amd64-${DATE}.tar.bz2}"
STAGE3_CONTENTS="${STAGE3_CONTENTS:-${STAGE3}.CONTENTS}"
STAGE3_DIGESTS="${STAGE3_DIGESTS:-${STAGE3}.DIGESTS.asc}"