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