1make: Bad modifier ":OX" for variable "NUMBERS" 2make: "varmod-order.mk" line 13: Undefined variable "${NUMBERS:OX" 3make: Bad modifier ":OxXX" for variable "NUMBERS" 4make: "varmod-order.mk" line 16: Undefined variable "${NUMBERS:Ox" 5make: Fatal errors encountered -- cannot continue 6make: stopped in unit-tests 7exit status 1 8