Since installing RCPL 9 I am no longer able to use the --enable-checkout-all-layers=yes option with any --enable-rcpl-version=000x where x < 9.
$ configure --enable-board=qemux86-64 \
--enable-rootfs=glibc_std --enable-kernel=standard \
--enable-checkout-all-layers=yes --with-rcpl-version=0008
Cloning /usr/work/tmp/layers/wr-bsps/intel-quark from /usr/tools/WindRiver/wrl501/wrlinux-5/layers/wr-bsps/intel-quark (LB34_5.0.1_RCPL0008)
Cloning into '/usr/work/tmp/layers/wr-bsps/intel-quark'...
done.
ERROR: Failed to checkout LB34_5.0.1_RCPL0008 in /usr/work/rdanter/tmp/layers/wr-bsps/intel-quark
Prior to installing RCPL 9 I was able to checkout all layers with RCPL 8.