SELinux: failure to build

Wondering if anyone has successfully built with this enabled. I have tried a number of times since it started coming into master, but it always fails with:

Collected errors:
 * check_conflicts_for: The following packages conflict with busybox:
 * check_conflicts_for: 	busybox-selinux * 
 * opkg_install_cmd: Cannot install package busybox.

I have tried a number of ways to exclude the one, in favour of the other, but have not met with success. Should be trivial as I build using a per-device FS, i.e.

CONFIG_TARGET_DEVICE_PACKAGES_mvebu_cortexa9_DEVICE_linksys_wrt1200ac="-mwlwifi-firmware-88w8964 -wpad-mini -dnsmasq -kmod-btmrvl -kmod-mwifiex-sdio -mwifiex-sdio-firmware -kmod-bluetooth -wpad-basic-wolfssl -ppp -ppp-mod-pppoe mwlwifi-firmware-88w8864 -busybox busybox-selinux"